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rev. 0 a ad1981bl information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 www.analog.com fax: 781/326-8703 ?2004 analog devices, inc. all rights reserved. ac ?7 soundmax codec functional block diagram a m mic1 mic2 phone_in cd_l cd_gnd cd_r aux_l aux_r line_in_l mic preamp cd diff amp mono_out hp_out_l hp mz line_out_l mz line_out_r hp_out_r hp output selector g = gain a = attenuation m = mute z = high z 16-bit - adc ga 16-bit - adc pcm front dac rate m 16-bit - adc m 16-bit - adc pcm l/r adc rate record selector v ref g v refout line_in_r codec core adc and dac slot logic eq core storage ac '97 control registers eapd pll xtl_out xtl_in spdif spdif tx id0 id1 reset sync bit_clk sdata_out sdata_in js0 js1 eapd ad1981bl g g 2cmic mix a m a a a m m ga m ga m ga m ga m ga m ga m ga m ga m m ga m m bypass eq bypass eq g g vo ltag e reference analog mixing control logic 20-bit - dac 20-bit - dac ac ' 97 interface m g m g ms features ac ?7 2.3 compatible features s/pdif output, 20 bits data format, supporting 48 khz and 44.1 khz sample rates integrated stereo headphone amplifier variable sample rate audio external audio power-down control greater than 90 db dynamic range stereo full-duplex codec 20-bit pcm dac 3 analog line-level stereo inputs for line-in, aux, and cd mono line-level phone input dual mic input with built-in programmable preamp high quality cd input with ground sense mono output for speakerphone or internal speaker power management support 48-lead lqfp package, lead-free package available enhanced features stereo mic preamps support built-in digital equalizer function for optimized speaker sound full-duplex variable sample rates from 7040 hz to 48 khz with 1 hz resolution jack sense pins provide automatic output switching software programmed v refout output for biasing microphone and external power amp low power 3.3 v operation for analog and digital supplies multiple codec configuration options
rev. 0 ? ad1981bl ?pecifications standard test conditions, unless otherwise noted temperature 25 c digital supply (dvdd) 3.3 v analog supply (avdd) 3.3 v sample rate (f s ) 48 khz input signal 1008 hz analog output pass band 20 hz to 20 khz dac test conditions calibrated ? db attenuation relative to full scale 0 db input 10 k ? output load (line_out) 32 ? output load (hp_out) adc test conditions calibrated 0 db gain input ?.0 db relative to full scale parameter min typ max unit analog input input voltage (rms values assume sine wave input) line_in, aux, cd, phone_in 0.707 v rms 2.0 v p-p mic_in with +20 db gain 0.0707 v rms 0.2 v p-p mic_in with 0 db gain 0.707 v rms 2.0 v p-p input impedance 1 20 k ? input capacitance 1 5 7.5 pf master volume step size (0 db to ?6.5 db): line_out_l, line_out_r 1.5 db output attenuation range 1 46.5 db step size (0 db to ?6.5 db): mono_out 1.5 db output attenuation range 1 46.5 db step size (0 db to ?6.5 db): hp_out_r, hp_out_l 1.5 db output attenuation range span 1 46.5 db mute attenuation of 0 db fundamental 1 80 db programmable gain amplifier?dc step size (0 db to 22.5 db) 1.5 db pga gain range 22.5 db analog mixer?nput gain/amplifiers/attenuators signal-to-noise ratio (snr) cd to line_out 90 db other to line_out 1 90 db step size (+12 db to ?4.5 db) (all steps tested): mic_in, line_in, cd, aux, phone_in, dac 1.5 db input gain/attenuation range: mic_in, line_in, cd, aux, phone_in, dac 46.5 db digital decimation and interpolation filters 1 pass band 0 0.4 f s hz pass-band ripple 0.09 db transition band 0.4 f s 0.6 f s hz stop band 0.6 f s hz stop-band rejection ?4 db group delay 16/f s sec group delay variation over pass band 0 s
rev. 0 ? ad1981bl parameter min typ max unit analog-to-digital converters resolution 16 bits total harmonic distortion (thd) ?7 db dynamic range (?0 db input thd+n referenced to full scale, a-weighted) 78 83 db signal-to-intermodulation distortion 1 (ccif method) 85 db adc crosstalk 1 line inputs (input l, ground r, read r; input r, ground l, read l) ?0 db line_in to other ?00 ?0 db gain error 2 (full-scale span relative to nominal input voltage) 10 % interchannel gain mismatch (difference of gain errors) 0.5 db adc offset error 1 5mv digital-to-analog converters resolution 20 bits total harmonic distortion (thd) line_out ?8 db total harmonic distortion (thd) hp_out ?1 db dynamic range (?0 db input thd+n referenced to full scale, 82 87.5 db a-weighted) signal-to-intermodulation distortion 1 (ccif method) ?00 db gain error 2 (output fs voltage relative to nominal output fs voltage) 10 % interchannel gain mismatch (difference of gain errors) 0.7 db dac crosstalk 1 (input l, zero r, measure r_out; input r, zero l, measure l_out) ?0 db analog output full-scale output voltage; line_out and mono_out 0.707 v rms 2.0 v p-p output impedance 1 800 ? external load impedance 1 10 k ? output capacitance 1 15 pf external load capacitance 1 100 pf full-scale output voltage; hp_out (0 db gain) 1 v rms external load impedance 1 32 ? v ref 1 1.12 1.225 v v ref_out 2.25 v v ref_out current drive 5ma mute click (muted output minus unmuted midscale dac output) 5mv static digital specifications high level input voltage (v ih ): digital inputs 0.65 dvdd v low level input voltage (v il ) 0.35 dvdd v high level output voltage (v oh ), i oh = 2 ma 0.9 dvdd v low level output voltage (v ol ), i ol = 2 ma 0.1 dvdd v input leakage current ?0 +10 a output leakage current ?0 +10 a power supply power supply range?av dd and dv dd ) 3.0 3.47 v power dissipation 287 mw analog supply current?.3 v (av dd )39ma digital supply current?.3 v (dv dd )48ma power supply rejection (100 mv p-p signal @ 1 khz) 1 (at both analog and digital supply pins, both adcs and dacs) 40 db
rev. 0 ? ad1981bl parameter set bits dv dd typ av dd typ unit power-down states * (fully active) (no bits value) 47.76 38.9 ma adc pr0 40.1 34.39 ma dac pr1 32.8 26.3 ma adc + dac pr1, pr0 13.2 20.55 ma mixer pr2 47.7 19.39 ma adc + mixer pr2, pr0 40 14.86 ma dac + mixer pr2, pr1 32.77 6.39 ma adc + dac + mixer pr2, pr1, pr0 13.9 1.15 ma standby pr5, pr4, pr3, pr2, pr1, pr0 0 0 ma headphone standby pr6 47.7 32 ma * values presented with v refout not loaded. specifications subject to change without notice. parameter symbol min typ max unit reset active low pulse width t rst_low 1.0 ms reset inactive to bit_clk start-up delay t rst2clk 162.8 ns sync active high pulse width t sync_high 1.3 s sync low pulse width t sync_low 19.5 s sync inactive to bit_clk start-up delay t sync2clk 162.8 ns bit_clk frequency 12.288 mhz bit_clk frequency accuracy 1 ppm bit_clk period t clk_period 81.4 ns bit_clk output jitter 1, 2, 3 750 2000 ps bit_clk high pulse width t clk_high 32.56 42 48.84 ns bit_clk low pulse width t clk_low 32.56 38 ns sync frequency 48.0 khz sync period t sync_period 20.8 ms setup to falling edge of bit_clk t setup 5 2.5 ns hold from falling edge of bit_clk t hold 5ns bit_clk rise time t riseclk 246ns bit_clk fall time t fallclk 246ns sync rise time t risesync 246ns sync fall time t fallsync 246ns sdata_in rise time t risedin 246ns sdata_in fall time t falldin 246ns sdata_out rise time t risedout 246ns sdata_out fall time t falldout 246ns end of slot 2 to bit_clk, sdata_in low t s2_pdown 0 1.0 ms setup to trailing edge of reset (applies to sync, sdata_out) t setup2rst 15 ns rising edge of reset to hi-z delay t off 25 ns propagation delay 15 ns reset rise time 50 ns output valid delay from rising edge of bit_clk to sdi valid 15 ns notes 1 guaranteed but not tested. 2 output jitter is directly dependent on crystal input jitter. 3 maximum jitter specification for noncrystal operation only. crystal operation maximum is much lower. specifications subject to change without notice. parameter min typ max unit clock specifications 1 input clock frequency 24.576 mhz recommended clock duty cycle 40 50 60 % notes 1 guaranteed but not tested. 2 measurements reflect main adc. specifications subject to change without notice. timing parameters (guaranteed over operating temperature range) specifications (continued)
rev. 0 ad1981bl ? reset bit_clk sdata_in t rst_low t rst2clk t tri2actv t tri2actv figure 1. cold reset timing (codec is supplying the bit_clk signal) sync bit_clk t sync_high t sync2clk figure 2. warm reset timing bit_clk sync t clk_low t clk_high t clk_period t sync_low t sync_period t sync_high figure 3. clock timing bit_clk sync sdata_in sdata_out t riseclk t fallclk t risesync t fallsync t risedin t falldin t risedout t falldout figure 4. signal rise and fall times
rev. 0 ad1981bl ? bit_clk sync sdata_in sdata_out bit_clk not to scale slot 1 slot 2 write to 0x20 data pr4 t s2_pdown figure 5. ac-link low power mode timing bit_clk sdata_out sdata_in sync t co t setup v ih v il v oh v ol t hold figure 6. ac-link low power mode timing, sync and bit_clk chopped reset sdata_out sdata_in, bit_clk, eapd, spdif_out and digital i/o hi-z t setup2rst t off figure 7. ate test mode
rev. 0 ad1981bl ? pin configuration 48-lead lqfp 1 2 3 4 5 6 7 8 9 10 11 12 dv dd 1 xtl_in xtl_out dv ss 1 sdata_out bit_clk dv ss 2 sdata_in dv dd 2 sync reset nc 36 35 34 33 32 31 30 29 28 27 26 25 line_out_r line_out_l av dd 4 av ss 4 afilt4 afilt3 afilt2 afilt1 v refout v ref av ss 1 av dd 1 13 14 15 16 17 18 19 20 21 22 23 24 phone_in aux_l aux_r js1 js0 cd_l cd_gnd_ref cd_r mic1 mic2 line_in_l line_in_r 48 47 46 45 44 43 42 41 40 39 38 37 spdif eapd id1 id0 av ss 3 av dd 3 nc hp_out_r av ss 2 hp_out_l av dd 2 mono_out ad1981bl top view (not to scale) nc = no connect absolute maximum ratings * (t a = 25 c, unless otherwise noted.) power supplies digital (dv dd ) . . . . . . . . . . . . . . . . . . . . . . ?.3 v to +3.6 v analog (av dd ) . . . . . . . . . . . . . . . . . . . . . . ?.3 v to +6.0 v input current (except supply pins) . . . . . . . . . . . . . . 10 ma signals pins digital input voltage . . . . . . . . . . . ?.3 v to dv dd + 0.3 v analog input voltage . . . . . . . . . . . ?.3 v to av dd + 0.3 v ambient temperature range (operating) . . . . . . 0 c to 70 c * stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. environmental conditions * ambient temperature rating (lqfp package) t case = case temperature in c pd = power dissipation in w ja thermal resistance (junction to ambient) jc thermal resistance (junction to case) ordering guide model temperature range package description package option 1 ad1981bljst 0 c to 70 c 48-lead lqfp (tray) st-48 ad1981bljst-reel 0 c to 70 c 48-lead lqfp (reel) st-48 ad1981bljstz 2 0 c to 70 c 48-lead lqfp (tray) st-48 ad1981bljstz-reel 2 0 c to 70 c 48-lead lqfp (reel) st-48 notes 1 st = low profile quad flatpack. 2 the ad1981bljstz is a lead-free environmentally friendly product. it is manufactured using the most up-to-date materials and pr ocesses. the coating on the leads of each device is 100% pure tin electroplate. the device is suitable for lead-free applications and is able to withstand surfac e-mount soldering at up to 255 c ( 5 c). in addition, it is backward compatible with conventional tin-lead soldering processes. this means that the electroplated tin co ating can be soldered with tin-lead solder pastes at reflow temperatures of 220 c to 235 c. package ja jc lqfp 50.1 c/w 17.8 c/w * all measurements per eia-jesd51 with 2s2p test board per eia-jesd51-7 caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the ad1981bl features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
rev. 0 ad1981bl ? pin function descriptions pin no. mnemonic i/o function digital i/o 2 xtl_in i crystal input (24.576 mhz) or external clock input. 3 xtl_out o crystal output. 5s data_out i ac-link serial data output, ad1981bl data input stream. 6 bit_clk o/i ac-link bit clock output (12.288 mhz) or bit clock input if secondary mode selected. 8s data_in o ac-link serial data input, ad1981bl data output stream. 10 sync i ac-link frame sync. 11 reset i ac-link reset, ad1981bl master hardware reset. 48 spdif o s/pdif output. chip selects (these pins can also be used to select an external clock. see table ix.) 45 id0 i chip select input 0 (active low). this pin can also be used as the chain input from a secondary codec. 46 id1 i chip select input 1 (active low). jack sense and eapd 17 js0 i jack sense 0 input. 16 js1 i jack sense 1 input. 47 eapd o external amp power-down control. analog i/o 13 phone_in i phone input. mono input from telephony subsystem speaker phone or handset. 14 aux_l i auxiliary input left channel. 15 aux_r i auxiliary input right channel. 18 cd_l i cd audio left channel. 19 cd_gnd_ref i cd audio analog ground reference for differential cd input. 20 cd_ r i cd audio right channel. 21 mic1 i microphone 1 input (mono) or left channel when 2-channel mode selected (stereo mic). 22 mic2 i microphone 2 input (mono) or right channel when 2-channel mode selected (stereo mic). 23 line_in_l i line in left channel. 24 line_in_r i line in right channel. 35 line_out_l o line out (front) left channel. 36 line_out_r o line out (front) right channel. 37 mono_out o monaural output to telephony subsystem speakerphone. 39 hp_out_l o headphone left channel output. 41 hp_out_r o headphone right channel output. filter/reference (these signals are connected to resistors, capacitors, or specific voltages.) 27 v ref o voltage reference filter. 28 v refout o voltage reference output 5 ma drive (intended for m ic bias and power amp bias). 29 afilt1 o antialiasing filter capacitor?dc right channel. 30 afilt2 o antialiasing filter capacitor?dc left channel. 31 afilt3 o antialiasing filter capacitor?ixer adc right channel. 32 afilt4 o antialiasing filter capacitor?ixer adc left channel. power and ground signals 1dv dd 1i digital v dd 3.3 v. 4dv ss 1i digital gnd. 7dv ss 2i digital gnd. 9dv dd 2i digital v dd 3.3 v. 25 av dd 1i analog v dd 5.0 v. 26 av ss 1i analog gnd. 38 av dd 2i analog v dd 5.0 v. 40 av ss 2i analog gnd. 43 av dd 3i analog v dd 5.0 v. 44 av ss 3i analog gnd. 34 av dd 4i analog v dd 5.0 v. 33 av ss 4i analog gnd. no connects 12 nc no connect. 42 nc no connect.
rev. 0 ad1981bl ? indexed control registers reg name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 00h reset x se4 se3 se2 se1 se0 id9 id8 id7 id6 id5 id4 id3 id2 id1 id0 0090h 02h master volume mm x x lmv4 lmv3 lmv2 lmv1 lmv0 rm * xx rmv4 rmv3 rmv2 rmv1 rmv0 8000h 04h headphones hpm x x lhv4 lhv3 lhv2 lhv1 lhv0 rm * xx rhv4 rhv3 rhv2 rhv1 rhv0 8000h volume 06h mono volume mvm x x xxx xxxx xmv4mv3mv2mv1mv0 8000h 0ch phone volume phm x x xxx xxxx x phv4 phv3 phv2 phv1 phv0 8008h 0eh mic volume mcm x x xxx xxxm20x mcv4 mcv3 mcv2 mcv1 mcv0 8008h 10h line-in volume lvm x x llv4 llv3 llv2 llv1 llv0 rm * xx rlv4 rlv3 rlv2 rlv1 rlv0 8808h 12h cd volume cvm x x lcv4 lcv3 lcv2 lcv1 lcv0 rm * xx rcv4 rcv3 rcv2 rcv1 rcv0 8808h 16h aux volume am x x lav4 lav3 lav2 lav1 lav0 rm * xx rav4 rav3 rav2 rav1 rav0 8808h 18h pcm-out vol om x x lov4 lov3 lov2 lov1 lov0 rm * xx rov4 rov3 rov2 rov1 rov0 8808h 1ah record select x x x x x ls2 ls1 ls0 x x xxx rs2 rs1 rs0 0000h 1ch record gain im x x x lim3 lim2 lim1 lim0 rm * x xx rim3 rim2 rim1 rim0 8000h 20h general-purpose x x x xxx mix ms lpbk x xxxxxx 0000h 26h power-down eapd pr6 pr5 pr4 pr3 pr2 pr1 pr0 x x x x ref anl dac adc 000xh ctrl/stat 28h ext? audio id idc1 idc0 x x revc1 revc0 amap x x x dsa1 dsa0 x spdif x vras x605h 2ah ext? audio stat/ vforce x x x x spcv xxxx spsa1 spsa0 x spdif x vra 0000h ctrl 2ch pcm front srf15 srf14 srf13 srf12 srf11 srf10 srf9 srf8 srf7 srf6 srf5 srf4 srf3 srf2 srf1 srf0 bb80h dac rate 32h pcm l/r sra15 sra14 sra13 sra12 sra11 sra10 sra9 sra8 sra7 sra6 sra5 sra4 sra3 sra2 sra1 sra0 bb80h adc rate 3ah spdif control v x spsr1 spsr0 l cc6 cc5 cc4 cc3 cc2 cc1 cc0 pre copy /aud pro 2000h 60h eq ctrl eqm mad x x x x x x sym chs bca5 bca4 bca3 bca2 bca1 bca0 8080h lben 62h eq data cfd15 cfd14 cfd13 cfd12 cfd11 cfd10 cfd9 cfd8 cfd7 cfd6 cfd5 cfd4 cfd3 cfd2 cfd1 cfd0 0000h 64h mixer adc, mxm x x x lmg3 lmg2 lmg1 lmg0 rm * x xx rmg3 rmg2 rmg1 rmg0 8000h volume 72h jack sense x x x js js js js1 js0 js1 js0 js1 js0 js1 js0 js1 js0 0000h mt2 mt1 mt0 eqb eqb tmr tmr md md st st int int 74h serial slot regm regm regm x x x chen x x x ints x spal spdz splnk 7001h configuration 16 2 1 0 76h misc control dacz x m lodis dam x fmxe x mad 2cmic x mad vref vref mbg1 mbg0 0000h bits splt pd st h d 7ch vendor id1 f7 f6 f5 f4 f3 f2 f1 f0 s7 s6 s5 s4 s3 s2 s1 s0 4144h 7eh vendor id2 t7 t6 t5 t4 t3 t2 t1 t0 rev7 rev6 rev5 rev4 rev3 rev2 rev1 rev0 5374h notes all registers not shown. bits containing an x are assumed to be reserved. odd register addresses are aliased to the next lower even address. reserved registers should not be written. zeros should be written to reserved bits. * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect.
rev. 0 ad1981bl ?0 reset register (index 00h) notes x in the above table is a wild card and has no effect on the value. writing any value to this register performs a register reset that causes all registers to revert to their default values (excep t 74h, which forces the serial configuration). reading this register returns the id code of the part and a code for the type of 3d stereo enhancement. id[9:0] identify capability. the id decodes the capabilities of ad1981bl based on the following: se[4:0] stereo enhancement. the ad1981bl does not provide hardware 3d stereo enhancement (all bits are zeros). master volume register (index 02h) * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. all registers not shown and bits containing an x are assumed to be reserve d. refer to table i for examples. this register controls the line_out volume controls for both stereo channels and the mute bit. e ach volume subregister contains five bits, generating 32 volume levels with 31 steps of 1.5 db each. because ac ?7 defines 6-bit v olume registers, to maintain compatibility whenever the d5 or d13 bits are set to 1, their respective lower five volume bits are auto matically set to 1 by the codec logic. on readback, all lower five bits will read 1s whenever these bits are set to 1. rmv[4:0] right master volume control. the least significant bit represents 1.5 db. this register controls the output from 0 db to a maximum attenuation of 46.5 db. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the mm bit. otherwise, this bit will always read 0 and will have no effect when set to 1. lmv[4:0] left master volume control. the least significant bit represents 1.5 db. this register controls the output from 0 db to a maximum attenuation of 46.5 db. mm master volume mute. when this bit is set to 1, both the left and right channels are muted, unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. bit function ad1981bl id0 dedicated mic pcm in channel 0 id1 modem line codec support 0 id2 bass and treble control 0 id3 simulated stereo (mono to stereo) 0 id4 headphone out support 1 id5 loudness (bass boost) support 0 id6 18-bit dac resolution 0 id7 20-bit dac resolution 1 id8 18-bit adc resolution 0 id9 20-bit adc resolution 0 reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 00h reset x se4 se3 se2 se1 se0 id9 id8 id7 id6 id5 id4 id3 id2 id1 id0 0090h reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 02h master mm x x lmv4 lmv3 lmv2 lmv1 lmv0 rm * xx rmv4 rmv3 rmv2 rmv1 rmv0 8000h volume
rev. 0 ad1981bl ?1 headphones volume register (index 04h) * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. all registers not shown, and bits containing an x are assumed to be reserv ed. refer to table i for examples. this register controls the headphone volume controls for both stereo channels and mute bit. each volume subregister contains five bits, generating 32 volume levels with 31 steps of 1.5 db each. because ac ?7 defines 6-bit v olume registers, to maintain compatibility, whenever the d5 or d13 bits are set to 1, their respective lower five volume bits are aut omati- cally set to 1 by the codec logic. on readback, all lower five bits will read 1s whenever these bits are set to 1. rhv [4:0] right headphone volume control. the least significant bit represents 1.5 db. this register controls the output from 0 db to a maximum attenuation of 46.5 db. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the hpm bit. otherwise, this bit will always read 0 and will have no effect when set to 1. lhv [4:0] left headphone volume control. the least significant bit represents 1.5 db. this register controls the output from 0 db to a maximum attenuation of 46.5 db. hpm headphones volume mute. when this bit is set to 1, both the left and right channels are muted, unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. table i. volume settings for master and headphone control bits reg. 76h master volume (02h) and headphone volume (04h) msplt * left channel volume d[13:8] right channel volume d[5:0] d15 write readback function d7 * write readback function 00 00 0000 00 0000 0 db gain x 00 0000 00 0000 0 db gain 00 00 1111 00 1111 ?2.5 db gain x 00 1111 00 1111 ?2.5 db gain 00 01 1111 01 1111 ?6.5 db gain x 01 1111 01 1111 ?6.5 db gain 00 1x xxxx 01 1111 ?6.5 db gain x 1x xxxx 01 1111 ?6.5 db gain 01 xx xxxx xx xxxx db gain, muted x xx xxxx xx xxxx db gain, muted 10 1x xxxx 01 1111 ?6.5 db gain 1 xx xxxx xx xxxx db gain, right only muted 11 xx xxxx xx xxxx db gain, left only muted 0 xx xxxx xx xxxx ?6.5 db gain 11 xx xxxx xx xxxx db gain, left muted 1 xx xxxx xx xxxx db gain, right muted * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. x in the above table is a wild card and has no effect on the value. reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 04h headphone hpm x x lhv lhv lhv lhv lhv rm * xxrhv rhv rhv rhv rhv 8000h volume 4 3 2 1 0 4 3 2 1 0
rev. 0 ad1981bl ?2 mono volume register (index 06h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 06h mono volume mvm x x x x x x x x x x mv4 mv3 mv2 mv1 mv0 8000h all registers not shown and bits containing an x are assumed to be reserved. refer to table ii for examples. this register controls the mono output volume and mute bit. the volume register contains five b its, generating 32 volume levels with 31 steps of 1.5 db each. because ac ?7 defines 6-bit volume registers, to maintain compatibil ity, whenever the d5 bit is set to 1, their respective lower five volume bits are automatically set to 1 by the codec logic. on readback, all lower five bits will read 1s whenever this bit is set to 1. mv[4:0] mono volume control. the least significant bit represents 1.5 db. this register controls the output from 0 db to a maximum attenuation of 46.5 db. mvm mono volume mute. when this bit is set to 1, the channel is muted. table ii. volume settings for mono control bits d[4:0] for mono (06h) d15 write readback function 0 0000 0 0000 0 db gain 00 1111 0 1111 ?2.5 db gain 01 1111 1 1111 ?6.5 db gain 1x xxxx x xxxx db gain, muted x in the above table is a wild card and has no effect on the value. phone volume register (index 0ch) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 0ch phone volume phm x x x x x x x x x x phv4 phv3 phv2 phv1 phv0 8008h all registers not shown and bits containing an x are assumed to be reserved. refer to table iii for examples. phv[4:0] phone volume. allows setting the phone volume attenuator in 32 volume levels with 31 steps of 1.5 db each. the lsb represents 1.5 db, and the gain range is +12 db to ?4.5 db. the default value is 0 db, with the mute bit enabled. phm phone mute. when this bit is set to 1, the phone channel is muted. all registers not shown and bits containing an x are assumed to be reserved. refer to table iii for examples. mcv[4:0] mi c volume gain. allows setting the phone volume attenuator in 32 volume levels with 31 steps of 1.5 db each. the lsb represents 1.5 db, and the gain range is +12 db to ?4.5 db. the default value is 0 db, with the mute bit enabled. m20 mic gain boost. this bit allows setting additional mic gain to increase the microphone sensitivity. the nominal gain boost by default is 20 db; however, bits d0 and d1 (mbg[1:0]) on the miscellaneous control bits register (76h) allow changing the gain boost to 10 db or 30 db if necessary. 0 = disabled; gain = 0 db 1 = enabled; default gain = 20 db (see register 76h, bits d0, d1) mcm mic mute. when this bit is set to 1, the mic channel is muted. mic volume register (index 0eh) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 0eh mic volume mcm x x x x x x x x m20 x mcv4 mcv3 mcv2 mcv1 mcv0 8008h all registers not shown and bits containing an x are assumed to be reserved. refer to table iii for examples.
rev. 0 ad1981bl ?3 table iii. volume settings for phone and mic control bits d[4:0] phone (0ch) and mic (0eh) d15 write readback function 00 0000 0 0000 12 db gain 00 1000 0 1000 0 db gain 01 1111 1 1111 ?4.5 db gain 1x xxxx x xxxx db gain, muted x in the above table is a wild card, and has no effect on the value. rlv[4:0] line-in volume right. allows setting the line-in right channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the lm bit. otherwise, this bit will always read 0 and will have no effect when set to 1. llv[4:0] line-in volume left. allows setting the line in left channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. lvm line-in mute. when this bit is set to 1, both the left and right channels are muted unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. rcv[4:0] right cd volume. allows setting the cd right channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the gain range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the cvm bit. otherwise, this bit will always read 0 and will have no affect when set to 1. lcv[4:0] left cd volume. allows setting the cd left channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the gain range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. cvm cd volume mute. when this bit is set to 1, both the left and right channels are muted, unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. line-in volume register (index 10h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 10h line-in volume lvm x x llv4 llv3 llv2 llv1 llv0 rm * xx rlv4 rlv3 rlv2 rlv1 rlv0 8808h * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, the rm bit has no effect. all registers not shown, and bits containing an x are assumed to be re served. refer to table iv for examples. cd volume register (index 12h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 12h cd volume cvm x x lcv4 lcv3 lcv2 lcv1 lcv0 rm * xx rcv4 rcv3 rcv2 rcv1 rcv0 8808h * for ac ?7 compatibility, bit d7 (rm) is only available by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, the rm bit has no effect. all registers not shown, and bits containing an x are assumed to be re served. refer to table iv for examples.
rev. 0 ad1981bl ?4 rav[4:0] right aux volume. allows setting the aux right channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the gain range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the am bit. otherwise, this bit will always read 0 and will have no affect when set to 1. lav[4:0] left aux volume. allows setting the aux left channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the gain range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. am aux mute. when this bit is set to 1, both the left and right channels are muted, unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. rov[4:0] right pcm-out volume. allows setting the pcm right channel attenuator in 32 volume levels. the lsb repre sents 1.5 db, and the range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the om bit. otherwise, this bit will always read 0 and will have no effect when set to 1. lov[4:0] left pcm-out volume. allows setting the pcm left channel attenuator in 32 volume levels. the lsb represents 1.5 db, and the range is +12 db to ?4.5 db. the default value is 0 db, mute enabled. om pcm-out volume mute. when this bit is set to 1, both the left and right channels are muted unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. table iv. volume settings for line-in, cd volume, aux, and pcm-out control bits reg. 76h line-in (10h), cd (12h), aux (16h), and pcm-out (18h) left channel volume d[12:8] right channel volume d[4:0] msplt * d15 write readback function d7 * write readback function 00 0 0000 0 0000 12 db gain x 0 0000 0 0000 +12 db gain 00 0 1000 0 1000 0 db gain x 0 1000 0 1000 0 db gain 00 1 1111 1 1111 34.5 db gain x 1 1111 1 1111 ?4.5 db gain 01 x xxxx x xxxx db gain, muted x x xxxx x xxxx db gain, muted 10 1 1111 1 1111 ?4.5 db gain 1 x xxxx x xxxx db gain, right only muted 11 x xxxx x xxxx db gain, 0 1 1111 1 1111 ?4.5 db gain left only muted 11 x xxxx x xxxx db gain, left muted 1 x xxxx x xxxx db gain, right muted * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. x in the above table is a wild card and has no effect on the value. aux volume register (index 16h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 16h aux volume am x x lav4 lav3 lav2 lav1 lav0 rm * xx rav4 rav3 rav2 rav1 rav0 8808h * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. all registers not shown, and bits containing an x are assumed to be reserv ed. refer to table iv for examples. pcm-out volume register (index 18h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 18h pcm-out volume om x x lov4 lov3 lov2 lov1 lov0 rm * xxrov4r ov3 rov2 rov1 rov0 8808h * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. all registers not shown, and bits containing an x are assumed to be reserv ed. refer to table iv for examples.
rev. 0 ad1981bl ?5 table v. settings for record select control ls [10:8] left record source rs [2:0] right record source 000 mic 000 mic 001 cd_l 001 cd_r 010 muted 010 muted 011 aux_l 011 aux_r 100 line_in_l 100 line_in_r 101 stereo mix (l) 101 stereo mix (r) 110 mono mix 110 mono mix 111 phone_in 111 phone_in rim[3:0] right input mixer gain control. each lsb represents 1.5 db, 0000 = 0 db, and the gain range is 0 db to 22.5 db. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the im bit. otherwise, this bit will always read 0 and will have no affect when set to 1. lim[3:0] left input mixer gain control. each lsb represents 1.5 db, 0000 = 0 db, and the gain range is 0 db to 22.5 db. im input mute. when this bit is set to 1, both the left and right channels are muted, unless the msplt bit in register 76h is set to 1, in which case this mute bit will affect only the left channel. table vi. settings for record gain register reg. 76h control bits?ecord gain (1ch) left channel input mixer d[11:8] right channel input mixer d[3:0] msplt * d15 write readback function d7 * write readback function 00 1111 1111 22.5 db gain x 1111 1111 22.5 db gain 00 0000 0000 0 db gain x 0000 0000 0 db gain 01 xxxx xxxx db gain, muted x xxxx xxxx db gain, muted 10 1111 1111 22.5 db gain 1 xxxx xxxx db gain, right only muted 11 xxxx xxxx db gain, left only muted 0 1111 1111 22.5 db gain 11 xxxx xxxx db gain, left muted 1 xxxx xxxx db gain, right muted * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. x is a wild card and has no effect on the value. rs[2:0] right record select ls[2:0] left record select record select control register (index 1ah) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 1ah record select x x x x x ls2 ls1 ls0 x x x x x rs2 rs1 rs0 0000h all registers not shown and bits containing an x are assumed to be reserved. used to select the record source independently for right and left. the default value is 0000h, which corresponds to mic in. refer to table v for examples. record gain register (index 1ch) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 1ch record gain im x x x lim3 lim2 lim1 lim0 rm * xx x rim3 rim2 rim1 rim0 8000h * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. all registers not shown and bits containing an x are assumed to be reserve d. refer to table vi for examples.
rev. 0 ad1981bl ?6 lpbk loopback control. adc/dac digital loopback mode. 0 = no loopback (default). 1 = loopback pcm digital data from adc output to dac. ms mic select. selects mono mic input. 0 = select mic1. 1 = select mic2. see 2cmic bit in register 76h to enable stereo microphone recording. mix mono output select. selects mono output audio source. 0 = mixer mono output (reset default). 1 = mic1 channel. general-purpose register (index 20h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 20h general-purpose x x x x x x mix ms lpbk x x x x x x x 0000h this register should be read before writing to generate a mask for only the bit(s) that need to be changed. all registers not s hown and bits containing an x are assumed to be reserved.
rev. 0 ad1981bl ?7 adc adc sections ready to transmit data. dac dac sections ready to accept data. anl analog amplifiers, attenuators, and mixers ready. ref voltage references, v ref and v refout up to nominal level. pr [6:0] codec power-down modes. the first three bits are to be used individually rather than in combination with each other. pr3 can be used in combination with pr2 or by itself. the mixer and reference cannot be powered down via pr3 unless the adcs and dacs are also powered down. nothing else can be powered up until the reference is up. pr5 has no effect unless all adcs, dacs, and the ac-link are powered down. the reference and the mixer can be either up or down, but all power-up sequences must be allowed to run to completion before pr5 and pr4 are both set. in multiple codec systems, the master codec? pr5 and pr4 bits control the slave codec. pr5 is also effective in the slave codec if the master? pr5 bit is clear, but the pr4 bit has no effect except to enable or disable pr5. eapd external audio power-down control. controls the state of the eapd pin. eapd = 0 sets the eapd pin low, enabling an external power amplifier (reset default). eapd = 1 sets the eapd pin high, shutting the external power amplifier off. power-down state set bits pr [6:0] adcs and input mux power-down pr0 [000 0001] dacs power-down pr1 [000 0010] analog mixer power-down (v ref and v refout on) pr1, pr2 [000 0101] analog mixer power-down (v ref and v refout off) pr0, pr1, pr3 [000 1011] ac-link interface power-down pr4 [001 0000] internal clocks disabled pr0, pr1, pr4, pr5 [011 0011] adc and dac power-down pr0, pr1 [000 0011] v ref standby mode pr0, pr1, pr2, pr4, pr5 [011 0111] total power-down pr0, pr1, pr2, pr3, pr4, pr5, pr6 [111 1111] headphone amp power-in standby pr6 [100 0000] power-down control/status register (index 26h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 26h power-down ctrl/stat eapd pr6 pr5 pr4 pr3 pr2 pr1 pr0 x x x x ref anl dac adc 000xh the ready bits are read-only; writing to ref, anl, dac, adc will have no effect. these bits indicate the status for the ad1981b l subsections. if the bit is a 1, that subsection is ready . ready is defined as the subsection able to perform in its nominal state. all registers not shown, and bits containing an x are assum ed to be reserved.
rev. 0 ad1981bl ?8 vras variable rate pcm audio support (read-only). this bit returns a 1 when read to indicates that the variable rate pcm audio is supported. spdif spdif support (read-only). this bit returns a 1 when read to indicates that the spdif transmitter is s upported (iec958). this bit is also used to validate that the spdif transmitter output is actually enabled. the spdif bit is allowed to be set high only if the spdif pin (48) is pulled down at power-up, enabling the codec transmitter logic. if the spdif pin is floating or pulled high at power-up, the transm itter logic is disabled; therefore, this bit returns a low, indicat- ing that the spdif transmitter is not available. this bit must always be read back to verify that the spdif transmitter is actually enabled. dsa[1,0] dac slot assignments (read/write) (reset default = 00). 00 dacs 1, 2 = 3 and 4. 01 dacs 1, 2 = 7 and 8. 10 dacs 1, 2 = 6 and 9. 11 reserved. amap slot dac mappings based on codec id (read-only). this bit returns a 1 when read to indicate that slot/dac mappings based on the codec id are supported. revc[1,0] revc[1,0] = 01 indicates codec is ac ?7 revision 2.2 compliant (read-only). idc[1:0] indicates codec configuration (read-only). 00 = primary. 01, 10, 11 = secondary. extended audio id register (index 28h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 28h ext? audio id idc1 idc0 x x revc1 revc0 amap x x x dsa1 dsa0 x spdif x vras x605h the extended audio id register identifies which extended audio features are supported. a nonzero extended audio id value indica tes that one or more of the ex- tended audio features are supported. all registers not shown, and bits containing an x are assumed to be reserved.
rev. 0 ad1981bl ?9 vra variable rate audio (read/write). vra = 0 sets fixed sample rate audio at 48 khz (reset default). vra = 1 enables variable rate audio mode (enables sample rate registers and slotreq signaling). spdif spdif transmitter subsystem enable/disable bit (read/write). spdif = 1 enables the spdif transmitter. spdif = 0 disables the spdif transmitter (default). this bit is also used to validate that the spdif transmitter output is actually enabled. the spdif bit is allowed to be set high only if the spdif pin (48) is pulled down at power-up, enabling the codec transmitter logic. if the spdif pin is floating or pulled high at power-up, the transmitter logic is disabled and this bit therefore returns a low, indicating that the spdif transmitter is not available. this bit must always be read back to verify that the spdif transmitter is actually enabled. spsa[1:0] spdif slot assignment bits (read/write). these bits control the spdif slot assignment and respective defaults, depending on the codec id configuration. spcv spdif configuration valid (read-only). indicates the status of the spdif transmitter subsystem, enabling the driver to determine if the currently programmed spdif configuration is supported. spcv is always valid, independent of the spdif enable bit status. spcv = 0 indicates current spdif configuration (spsa, spsr, dac slot rate, drs) is not valid (not supported). spcv = 1 indicates current spdif configuration (spsa, spsr, dac slot rate, drs) is valid (is supported). vforce validity force bit (reset default = 0). when asserted, this bit forces the spdif stream validity flag (bit 28 within each spdif l/r subframe) to be controlled by the v bit (d15) in register 3ah (spdif control register). vforce = 0 and v = 0; the validity bit is managed by the codec error detection logic. vforce = 0 and v = 1; the validity bit is forced high, indicating subframe data is invalid. vforce = 1 and v = 0; the validity bit is forced low, indicating subframe data is valid. vforce = 1 and v = 1; the validity bit is forced high, indicating subframe data is invalid. extended audio status and control register (index 2ah) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 2ah ext? audio stat/ctrl vforce x x x x spcv x x x x spsa1 spsa0 x spdif x vra 0000h all registers not shown and bits containing an x are assumed to be reserved. the extended audio status and control register is a read/write register that provides status and control of the extended audio features.
rev. 0 ad1981bl ?0 ac ?7 2.2 amap compliant default spdif slot assignments codec id function spsa = 00 spsa = 01 spsa = 10 spsa = 11 00 2-ch primary w/spdif 3 and 4 7 and 8 (default) 6 and 9 10 and 11 00 4-ch primary w/spdif 3 and 4 7 and 8 6 and 9 (default) 10 and 11 00 6-ch primary w/spdif 3 and 4 7 and 8 6 and 9 10 and 11 (default) 01 +2-ch secondary w/spdif 3 and 4 7 and 8 6 and 9 (default) 01 +4-ch secondary w/spdif 3 and 4 7 and 8 6 and 9 10 and 11 (default) 10 +2-ch secondary w/spdif 3 and 4 7 and 8 6 and 9 (default) 10 +4-ch secondary w/spdif 3 and 4 7 and 8 6 and 9 10 and 11 (default) 11 +2-ch secondary w/spdif 3 and 4 7 and 8 6 and 9 10 and 11 (default) srf[15:0] sample rate. the sampling frequency range is from 7 khz (1b58h) to 48 khz (bb80h) in 1 hz increments. if 0 is written to vra, the sample rate is reset to 48 khz. sra[15:0] sample rate. the sampling frequency range is from 7 khz (1b58h) to 48 khz (bb80h) in 1 hz increments. if 0 is written to vra, the sample rate is reset to 48 khz. pcm front dac rate register (index 2ch) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 2ch pcm front srf15 srf14 srf13 srf12 srf11 srf10 srf9 srf8 srf7 srf6 srf5 srf4 srf3 srf2 srf1 srf0 bb80h dac rate this read/write sample rate control register contains a 16-bit unsigned value, representing the rate of operation in hz. pcm adc rate register (index 32h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 32h pcm l/r sra15 sra14 sra13 sra12 sra11 sra10 sra9 sra8 sra7 sra6 sra5 sra4 sra3 sra2 sra1 sra0 bb80h adc rate this read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in hz.
rev. 0 ad1981bl ?1 pro professional. 1 indicates professional use of channel status. 0 indicates consumer. aud non-audio. 1 indicates data is non-pcm format. 0 data is pcm. copy copyright. 1 indicates copyright is asserted. 0 copyright is not asserted. pre pre-emphasis. 1 indicates filter pre-emphasis is 50 s/15 s. 0 pre-emphasis is none. cc[6:0] category code. programmed according to iec standards, or as appropriate. lg eneration level. programmed according to iec standards, or as appropriate. spsr[1:0] spdif transmit sample rate. spsr[1:0] = 00 transmit sample rate = 44.1 khz. spsr[1:0] = 01 reserved. spsr[1:0] = 10 transmit sample rate = 48 khz (reset default). spsr[1:0] = 11 not supported. vv alidity. this bit affects the validity flag (bit 28 transmitted in each spdif l/r subframe) and enables the spdif transmitter to maintain connection during error or mute conditions. v = 1 each spdif subframe (l + r) has bit 28 set to 1. this tags both samples as invalid. v = 0 each spdif subframe (l + r) has bit 28 set to 0 for valid data and 1 for invalid data (error condition). note that when v = 0, asserting the vforce bit (d15) in register 2ah (ext? audio stat/ctrl) will force the validity flag low, marking both samples as valid. spdif control register (index 3ah) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 3ah spdif v x spsr1 spsr0 l cc6 cc5 cc4 cc3 cc2 cc1 cc0 pre copy aud pro 2000h control register 3ah is a read/write register that controls spdif functionality and manages bit fields propagated as channel status (or subframe in the v case). with the exception of v, this register should be written to only when the spdif transmitter is disabled (spdif bit in register 2ah is 0) . this ensures that control and status information start up correctly at the beginning of spdif transmission.
rev. 0 ad1981bl ?2 bca[5,0] biquad and coefficient address pointer biquad 0 coef a0 bca[5,0] = 011011 biquad 0 coef a1 bca[5,0] = 011010 biquad 0 coef a2 bca[5,0] = 011001 biquad 0 coef b1 bca[5,0] = 011101 biquad 0 coef b2 bca[5,0] = 011100 biquad 1 coef a0 bca[5,0] = 100000 biquad 1 coef a1 bca[5,0] = 011111 biquad 1 coef a2 bca[5,0] = 011110 biquad 1 coef b1 bca[5,0] = 100010 biquad 1 coef b2 bca[5,0] = 100001 biquad 2 coef a0 bca[5,0] = 100101 biquad 2 coef a1 bca[5,0] = 100100 biquad 2 coef a2 bca[5,0] = 100011 biquad 2 coef b1 bca[5,0] = 100111 biquad 2 coef b2 bca[5,0] = 100110 biquad 3 coef a0 bca[5,0] = 101010 biquad 3 coef a1 bca[5,0] = 101001 biquad 3 coef a2 bca[5,0] = 101000 biquad 3 coef b1 bca[5,0] = 101100 biquad 3 coef b2 bca[5,0] = 101011 biquad 4 coef a0 bca[5,0] = 101111 biquad 4 coef a1 bca[5,0] = 101110 biquad 4 coef a2 bca[5,0] = 101101 biquad 4 coef b1 bca[5,0] = 110001 biquad 4 coef b2 bca[5,0] = 110000 biquad 5 coef a0 bca[5,0] = 110100 biquad 5 coef a1 bca[5,0] = 110011 biquad 5 coef a2 bca[5,0] = 110010 biquad 5 coef b1 bca[5,0] = 110110 biquad 5 coef b2 bca[5,0] = 110101 biquad 6 coef a0 bca[5,0] = 111001 biquad 6 coef a1 bca[5,0] = 111000 biquad 6 coef a2 bca[5,0] = 110111 biquad 6 coef b1 bca[5,0] = 111011 biquad 6 coef b2 bca[5,0] = 111010 chs channel select. chs = 0 selects left channel coefficients data block. chs = 1 selects right channel coefficients data block. sym symmetry. when set to 1, this bit indicates that the left and right channel coefficients are equal. this shortens the coefficients setup sequence since only the left channel coefficients need to be addressed and set up (the right chan- nel coefficients are fetched from the left channel memory). mad mixer adc loopback enable. enables mixer adc data to be summed into pcm stream. lben 0 = no loopback allowed (default). 1 = enable loopback. eqm equalizer mute. when set to 1, this bit disables the equalizer function (allows all data to pass through). the reset default sets this bit to 1, disabling the equalizer function until the biquad coefficients can be properly set. eq control register (index 60h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 60h eq ctrl eqm mad x x x x x x sym chs bca5 bca4 bca3 bca2 bca1 bca0 8080h lben register 60h is a read/write register that controls the equalizer functionality and data setup. this register also contains the biquad and coefficient address pointer, which is used in conjunction with the eq data register (78h) to set up the equalizer coefficients. the reset default disables t he equalizer function until the coefficients can be properly set up by the software and sets the symmetry bit to allow equal coefficients for left and right channels. all r egisters not shown and bits containing an x are assumed to be reserved.
rev. 0 ad1981bl ?3 cfd[15:0] coefficient data. the biquad coefficients are fixed point format values with 16 bits of resolution. the cfd15 bit is the msb, and the cfd0 bit is the lsb. rmg[3:0] right mixer gain control. this register controls the gain into the mixer adc from 0 db to a maximum gain of 22.5 db. the least significant bit represents 1.5 db. rm right channel mute. once enabled by the msplt bit in register 76h, this bit mutes the right channel separately from the mxm bit. otherwise, this bit will always read 0 and will have no affect when set to 1. lmg[3:0] left mixer gain control. this register controls the gain into the mixer adc, from 0 db to a maximum gain of 22.5 db. the least significant bit represents 1.5 db. mxm mixer gain register mute. 0 = unmuted. 1 = muted (reset default). eq data register (index 62h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 62h eq data cfd15 cfd14 cfd13 cfd12 cfd11 cfd10 cfd9 cfd8 cfd7 cfd6 cfd5 cfd4 cfd3 cfd2 cfd1 cfd0 0000h this read/write register is used to transfer eq biquad coefficients into memory. the register data is transferred to, or retrie ved from, the address pointed to by the bca bits in the eq cntrl register (60h). data will be written to memory only if the eqm bit (register 60h, bit 15) is asserted. mixer adc, input gain register (index 64h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 64h mixer mxm x x x lmg3 lmg2 lmg1 lmg0 rm * xx x rmg3 rmg2 rmg1 rmg0 8000h volume * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, the rm bit has no effect. all registers not shown and bits containing an x are assumed to be res erved. refer to table vii for examples. table vii. settings for mixer adc, input gain control bits reg. 76h mixer adc, input gain (64h) left channel mixer gain d[11:8] right channel mixer gain d[3:0] msplt * d15 write readback function d7 * write readback function 00 1111 1111 22.5 db gain x 1111 1111 22.5 db gain 00 0000 0000 0 db gain x 0000 0000 0 db gain 01 xxxx xxxx db gain, muted x xxxx xxxx db gain, muted 10 1111 1111 22.5 db gain 1 xxxx xxxx db gain, right only muted 11 xxxx xxxx db gain, left only muted 0 1111 1111 22.5 db gain 11 xxxx xxxx db gain, left muted 1 xxxx xxxx db gain, right muted * for ac ?7 compatibility, bit d7 (rm) is available only by setting the msplt bit, register 76h. the msplt bit enables separate mute bits for the left and right channels. if msplt is not set, rm bit has no effect. x is a wild card and has no effect on the value.
rev. 0 ad1981bl ?4 jack sense/audio interrupt/status register (index 72h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 72h jack sense x x x js js js js1 js0 js1 js0 js1 js0 js1 js0 js1 js0 0000h mt2 mt1 mt0 eqb eqb tmr tmr md md st st int int all register bits are read/write except for js0st and js1st, which are read-only. all registers not shown and bits containing a n x are assumed to be reserved. js0int indicates pin js0 has generated an interrupt. remains set until the software services js0 interrupt, i.e., js0 isr should clear this bit by writing a 0 to it. note that the interru pt to the system is actually an or combination of this bit and js1int. also note that the actual interrupt implementation is selected by the ints bit (register 76h). it is also possible to generate a software system interrupt by writing a 1 to this bit. js1int indicates pin js1 has generated an interrupt. remains set until the software services js1 interrupt, i.e., js1 isr should clear this bit by writing a 0 to it. see js0int description for additional details. js0st js0 state. this bit always reports the logic state of js0 pin. js1st js1 state. this bit always reports the logic state of js1 pin. js0md js0 mode. this bit selects the operation mode for the js0 pin. 0 = jack sense mode (default). 1 = interrupt mode. js1md js1 mode. this bit selects the operation mode for the js1 pin. 0 = jack sense mode (default). 1 = interrupt mode. js0tmr js0 timer enable. if this bit is set to a 1, js0 must be high for greater than 278 ms to be recognized. js1tmr js1 timer enable. if this bit is set to a 1, js1 must be high for greater than 278 ms to be recognized. js0eqb js0 eq bypass enable. this bit enables js0 to control the eq bypass. when this bit is set to 1, js0 = 1 will cause the eq to be bypassed. js1eqb js1 eq bypass enable. this bit enables js1 to control the eq bypass. when this bit is set to 1, js1 = 1 will cause the eq to be bypassed. jsmt[2,0] js mute enable selector. these three bits select and enable the jack sense muting action (see table viii).
rev. 0 ad1981bl ?5 table viii. jack sense mute select?smt [2:0] js1 js0 h.p. line ref headphone line out jsmt2 jsmt1 jsmt0 out out mono out notes 0 out (0) out (0) 0 0 0 active active active js0 and js1 ignored. 1 out (0) in (1) 0 0 0 active active active 2i n (1) out (0) 0 0 0 active active active 3i n (1) in (1) 0 0 0 active active active 4 out (0) out (0) 0 0 1 fmute fmute active js0 no mute action; js1 mutes line_out. 5 out (0) in (1) 0 0 1 fmute active active 6i n (1) out (0) 0 0 1 active fmute active 7i n (1) in (1) 0 0 1 active fmute active 8 out (0) out (0) 0 1 0 fmute fmute active js0 no mute action; js1 mutes mono and line_out. 9 out (0) in (1) 0 1 0 fmute active active 10 in (1) out (0) 0 1 0 active fmute fmute 11 in (1) in (1) 0 1 0 active fmute fmute 12 out (0) out (0) 0 1 1 ** ** ** ** reserved 13 out (0) in (1) 0 1 1 ** ** ** 14 in (1) out (0) 0 1 1 ** ** ** 15 in (1) in (1) 0 1 1 ** ** ** 16 out (0) out (0) 1 0 0 fmute fmute active js0 mutes mono; js1 no mute action. 17 out (0) in (1) 1 0 0 fmute active fmute 18 in (1) out (0) 1 0 0 active fmute active 19 in (1) in (1) 1 0 0 active active fmute 20 out (0) out (0) 1 0 1 fmute fmute active js0 mutes mono; js1 mutes line_out. 21 out (0) in (1) 1 0 1 fmute active fmute 22 in (1) out (0) 1 0 1 active fmute active 23 in (1) in (1) 1 0 1 active fmute fmute 24 out (0) out (0) 1 1 0 fmute fmute active js0 mutes mono; js1 mutes mono and line_out. 25 out (0) in (1) 1 1 0 fmute active fmute 26 in (1) out (0) 1 1 0 active fmute fmute 27 in (1) in (1) 1 1 0 active fmute fmute 28 out (0) out (0) 1 1 1 ** ** ** ** reserved 29 out (0) in (1) 1 1 1 ** ** ** 30 in (1) out (0) 1 1 1 ** ** ** 31 in (1) in (1) 1 1 1 ** ** ** fmute = output is forced to mute independent of the respective volume register setting. active = output is not muted and its status is dependent on the respective volume register setting. out = nothing plugged into the jack and therefore the js status is low (via the load resistor pull-down). in = jack has plug inserted and therefore the js status is high (via the codec js internal pull-up).
rev. 0 ad1981bl ?6 splnk spdif link. this bit enables the spdif to link with the dac for data requesting. 0 = spdif and dac are not linked. 1 = spdif and dac are linked and receive the same data requests (reset default). spdz spdif dacz. 0 = repeat last sample out of the spdif stream if fifo underruns (reset default). 1 = forces midscale sample out the spdif stream if fifo underruns. spal spdif adc loop-around. 0 = spdif transmitter is connected to the ac-link stream (reset default). 1 = spdif transmitter is connected to the digital adc stream, not the ac-link. ints interrupt mode select. this bit selects the js interrupt implementation path. 0 = bit 0 slot 12 (modem interrupt). 1 = slot 6 valid bit (mic adc interrupt). chen chain enable. this bit enables chaining of a slave codec sdata_in stream into the id0 pin (pin 45). 0 = disable chaining (reset default). 1 = enable chaining into id0 pin. regm0 master codec register mask. regm1 slave 1 codec register mask. regm2 slave 2 codec register mask. slot16 enable 16-bit slot mode. slot16 makes all ac-link slots 16 bits in length, formatted into 16 slots. this is a preferred mode for dsp serial port interfacing. mbg[1:0] mic boost gain change register. these two bits allow changing the mic preamp gain from the nominal 20 db gain. note: this gain setting takes affect only while bit d6 (m20) on the mic volume register (0eh) is set to 1; otherwise, the mic boost block has a gain of 0 db. 00 = 20 db gain (reset default). 01 = 10 db gain. 10 = 30 db gain. 11 = reserved. vrefd v refout disable. disables v refout , placing it into high z out mode. note that this bit overrides the vrefh bit selection (see below). 0 = v refout pin is driven by the internal reference (reset default). 1 = v refout pin is placed into high z out mode. vrefh v refout high. changes v refout from 2.25 v to 3.70 v for mic bias applications. 0 = v refout pin is set to 2.25 v output (reset default). 1 = v refout pin is set to 2.25 v output. serial configuration register (index 74h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 74h serial slot16 regm2 regm1 regm0 x x x chen xxx ints x spal spdz splnk 7001h config- uration this register is not reset when the reset register (register 00h) is written. all registers not shown and bits containing an x are assumed to be reserved. miscellaneous control bit register (index 76h) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 76th misc dacz x msplt lodis dam x fmxe x madpd 2cmic x madst vrefh vrefd mbg1 mbg0 0000h control bits all registers not shown and bits containing an x are assumed to be reserved.
rev. 0 ad1981bl ?7 vendor id register (index 7ch to 7eh) reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 7ch vendor id1 f7 f6 f5 f4 f3 f2 f1 f0 s7 s6 s5 s4 s3 s2 s1 s0 4144h s[7:0] this register is ascii encoded to a. f[7:0] this register is ascii encoded to d. reg no. name d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 default 7eh vendor id2 t7 t6 t5 t4 t3 t2 t1 t0 rev7 rev6 rev5 rev4 rev3 rev2 rev1 rev0 5374h t[7:0] this register is ascii encoded to s. rev[7:0] vendor specific revision number: the ad1981bl assigns 74h to this field. table ix. codec id and external clock selection table id1 id0 codec id codec clocking source 11 (00) primary 24.576 mhz (local xtal or external into xtl_in) 10 (01) secondary 12.288 mhz (external into bit_clk) 01 (00) primary 48.000 mhz (external into xtl_in) 00 (00) primary 14.31818 mhz (external into xtl_in) note that internally, the id pins have weak pull-ups and are inverted. madst mixer adc status bit. indicates status of mixer digitizing adc (left and right channels). 0 = mixer adc not ready. 1 = mixer adc ready. madpd mixer adc power-down. controls power down for mixer digitizing adc. 0 = mixer adc is powered on (default). 1 = mixer adc is powered down. 2cmic 2-channel mic select. this bit enables simultaneous recording from mic1 and mic2 inputs for applications that use a stereo microphone array. note that this register works in conjunction with the ms bit in register 20h. 0 = mic1 or mic2 (determined by ms bit) is routed to the record selector? left and right mic channels as well as to the mixer (reset default). 1 = mic1 is routed to the record selector? left mic channel and mic2 is routed to the record selector? r ight mic channel. note that in this mode, the ms bit should be set low and mic1 can still be enabled into the mixer. fmxe front dac into mixer enable. controls the front (main) dac to mixer mute switches. 0 = front dac outputs are allowed to sum into the mixer (reset default). 1 = front dac outputs are muted into the mixer (blocked). dam digital audio mode. pcm dac outputs bypass the analog mixer and are sent directly to the codec output. lodis line_out disable. disables the line_out pins (l/r), placing them into high z mode so that the assigned output audio jack can be shared for input function (or other function). 0 = line_out pins have normal audio drive capability (reset default). 1 = line_out pins are placed into high z mode. msplt mute split. allows separate mute control bits for master, headphone, line_in, cd, aux, and pcm volume control registers as well as record gain register. 0 = both left and right channel mutes are controlled by bit 15 in the respective registers (reset default). 1 = bit 15 affects only the left channel mute and bit 7 affects only the right channel mute. dacz dac zero-fill. determines dac data fill under starved conditions. 0 = dac data is repeated when dacs are starved for data (reset default). 1 = dac is zero-filled when dacs are starved for data.
rev. 0 ?8 d04321?1/04(0) ad1981bl outline dimensions 48-lead low profile quad flat package [lqfp] (st-48) dimensions shown in millimeters top view (pins down) 1 12 13 25 24 36 37 48 0.27 0.22 0.17 0.50 bsc 7.00 bsc sq seating plane 1.60 max 0.75 0.60 0.45 view a 9.00 bsc sq pin 1 0.20 0.09 1.45 1.40 1.35 0.08 max coplanarity view a rotated 90 ccw seating plane 10 6 2 7 3.5 0 0.15 0.05 compliant to jedec standards ms-026bbc

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