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general description the max4399 audio/video switch is ideal for digital set-top box applications. the max4399 provides video and audio routing from the mpeg decoder source to the tv, vcr, and aux scart (peritelevision) connectors. in addition, the tv audio channel features clickless switching and programmable volume control from -56db to +6db in 2db steps. the device can mix an auxiliary audio tone into the tv audio channel and can mix the stereo audio signal into a mono audio signal. the max4399 directly drives an external rf modulator with a composite video with blanking and sound (cvbs) signal created by an on-chip luma/chroma (y/c) mixer and external rlc trap filter. the max4399 features a fast-mode i 2 c-compatible 2-wire interface allowing communication at data rates up to 400kbps.the max4399 operates with standard +5v and +12v single supplies and supports slow and fast switching. all video and audio inputs are ac-coupled. the dc biases of all input and output signals are set to pre- defined levels. all video outputs, including the rf mod- ulator, drive standard 150 loads. red, green, and blue (rgb) outputs feature a programmable gain of+6db ?db. all other video outputs have a fixed +6db gain. the vcr and aux audio output gains are pro- grammable for -6db, 0db, and +6db. the max4399 is available in a compact 68-pin thin qfn package and is specified for the 0? to +70? commercial temperature range. the max4399 evalua- tion kit is available to help speed designs. applications satellite receiverssatellite set-top boxes cable set-top boxes terrestrial set-top boxes game consoles tvs digital television (dtv) vcrs dvd players dvd+r/w players features ? low -86db video signal-to-noise ratio ? 150 driver on all video outputs, including the rf modulator ? full cvbs loop-through on aux scart ? programmable audio gain control of -56db to +6db (tv audio outputs) ? clickless audio switching (tv audio outputs) ? programmable clamp or bias on red/chromavideo inputs ? programmable video gain of +6db, 1db on rgboutputs ? +5v and +12v standard supply voltages ? 27mhz -3db large-signal bandwidth on all videodrivers ? supports three scart connectors max4399 audio/video switch for three scart connectors ________________________________________________________________ maxim integrated products 1 ordering information max4399 scart switch matrix i 2 c-compatible 2-wire interface stb encoder rgb s-vhs cvbs r/l audio fast switching vcr scart connector tone input cvbs s-vhs rgb r/l audio fast switching slow switching tv scart connector auxiliary scart connector channel 3/4 rf modulator subcarrier trap cvbs s-vhs rgb r/l audio slow switching fast switching cvbs mono audio r/l phono audio cvbs s-vhs r/l audio slow switching video ground digital ground audio ground video +5v digital +5v audio +12v satellite dish typical operating circuit 19-2925; rev 1; 7/06 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part temp range pin-package pkg code max4399ctk 0 c to +70 c 68 thin qfn t6800-3 downloaded from: http:///
max4399 audio/video switch for three scart connectors 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltages v_vid to g_vid .....................................................-0.3v to +6v v12 to g_aud .....................................................-0.3v to +14v v_dig to g_dig ....................................................-0.3v to +6v g_aud to g_dig ...............................................-0.1v to +0.1v g_vid to g_dig .................................................-0.1v to +0.1v g_aud to g_vid ................................................-0.1v to +0.1v video inputs, video outputs, enc_fs_in, vcr_fs_in, vid_bias, trap ................................-0.3v to (v v_vid + 0.3v) v_aud to g_aud................................................-0.3v to +9v audio inputs, audio outputs, aud_bias........................................-0.3v to (v v_aud + 0.3v) sda, scl, dev_addr, interrupt_out .........-0.3v to +6v aux_ss, tv_ss, vcr_ss ....................-0.3v to (v v12 + 0.3v) currents interrupt_out ..........................................................+50ma trap................................................................................?ma output short circuit video outputs and tv_fs_out to v_vid, v_dig, g_aud, g_vid, or g_dig ........................continuous audio outputs to v_aud, v_vid, v_dig, g_aud, g_vid, or g_dig.....................................continuous aux_ss, tv_ss, and vcr_ss to v12, v_aud, v_vid, v_dig, g_aud, g_vid, or g_dig...................................................continuous continuous power dissipation (t a = +70?) 68-pin thin qfn (derate 41.7mw/? above +70?).........................................................3333.3mw operating temperature range...............................0? to +70? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics(v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units dc v12 supply voltage range inferred from the slow switch output levels 11.4 12 12.6 v v_vid supply voltage range inferred from the output swing of the videooutputs 4.75 5 5.25 v v_dig supply voltage range 4.75 5 5.25 v v12 quiescent supply current 17 35 ma v_vid quiescent supply current all video output amplifiers are enabled, noload 51 116 ma v_vid standby supply current all video output amplifiers are in shutdown,and tv_fs_out driver is in shutdown 19 34 ma v_dig quiescent supply current 13m a video cvbs and s-vhs 5.5 6 6.5 r, g, b, gain = 5db 4.5 5 5.5 r, g, b, gain = 6db 5.5 6 6.5 voltage gain 1v p-p input r, g, b, gain = 7db 6.5 7 7.5 db cvbs and s-vhs 110 small-signal bandwidth, -3db 100mv p-p input, gain = 6db r, g, b 110 mhz cvbs and s-vhs 15 27 large-signal bandwidth, -3db 1v p-p input, gain = 6db, t a = +25 c (note 2) r, g, b 30 mhz downloaded from: http:///
max4399 audio/video switch for three scart connectors _______________________________________________________________________________________ 3 electrical characteristics (continued)(v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units slew rate sr 1v p-p input, gain = 6db 170 v/? gain matching 1v p-p input, between rgb or y-c -0.5 0 +0.5 db rf_cvbs_out 0.03 differential gain dg 5-stepmodulated staircase all other video outputs 0.13 % rf_cvbs_out 0.09 differential phase dp 5-stepmodulated staircase all other video outputs 0.36 degrees signal-to-noise ratio snr 1v p-p input -86 db rf_cvbs_out 5 group delay f = 0.1mhz to6mhz all other video outputs 3 ns bottom level clamp rgb, composite and luma, no signal, noload 1.21 v chroma bias chroma only, no signal, no load 1.88 v sync crush percentage reduction in sync pulse(0.3v p-p ); inferred from input clamping current with a 0.1? coupling capacitor -2 0 +2 % power-supply rejection ratio psrr f = 100khz, 0.5v p-p 60 db cvbs, y, or rgb video input 4 m ? input impedance chroma video input 11 k ? input clamp current v in = 1.75v 2.5 4.2 8.0 ? rgb, composite, andluma 1.05 output bias voltage no signal, noload chroma 2.24 v pulldown resistance vcr_r/c_out, aux_r/c_out,tv_r/c_out 10 ? crosstalk f = 4.43mhz, 1v p-p input, between any two active inputs -63 db mute suppression f = 4.43mhz, 1v p-p input, on one input -65 db audio v_aud voltage generated by internal linear regulator 8.1 v voltage gain 1.414v p-p input, gain = 0db -0.25 0 +0.25 db gain matching betweenchannels 1.414v p-p input, gain = 0db -0.5 0 +0.5 db gain flatness f = 20hz to 20khz, 0.5v rms input, gain = 0db 0.005 db frequency bandwidth 0.5v rms input; frequency where output is -3db with 1khz serving as 0db 210 khz downloaded from: http:///
max4399 audio/video switch for three scart connectors 4 _______________________________________________________________________________________ electrical characteristics (continued)(v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units input dc level gain = 0db v_aud/2 v input signal amplitude inferred through total harmonic distortionspecification, f = 1khz 2v rms input resistance 100 k ? output dc level v_aud/2 v signal-to-noise ratio snr f = 1.0khz, 1v rms , gain = 0db, 20hz to 20khz 105 db f = 1.0khz, 0.5v rms 0.002 total harmonic distortion thd r load = 10k ? f = 1.0khz, 2v rms 0.005 % output impedance 0.5 ? tv audio, volume controlrange extends from -56db to +6db 1.5 2 2.5 volume attenuation step 1.414v p-p input vcr, aux audio 5.5 6 6.5 db power-supply rejection ratio psrr f = 1khz, 0.5v p-p 110 db mute suppression f = 1khz, 0.5v rms input 105 db audio limiter level f = 1khz, 2.5v rms input 6.7 v p-p crosstalk f = 1khz, 0.5v rms , gain = 0db 105 db digital interface: sda and scl low-level input voltage v il 0.8 v high-level input voltage v ih 2.6 v hysteresis of schmitt triggerinput 0.2 v i sink = 3ma 0 0.4 sda low-level output voltage v ol i sink = 6ma 0 0.6 v output fall time for sda line 400pf bus load 250 ns spike suppression 50 ns input current v il = 0v, v ih = 5v -10 +10 ? input capacitance 5p f scl clock frequency 0 400 khz hold time t hd , sta repeated start condition 0.6 ? low period of scl clock t low 1.3 ? high period of scl clock t high 0.6 ? setup time for a repeated startcondition t su,sta 0.6 ? data hold time t hd , dat 0 0.9 ? data setup time t su , dat 100 ns maximum receive scl/sda risetime t r (note 3) 300 ns downloaded from: http:///
max4399 audio/video switch for three scart connectors _______________________________________________________________________________________ 5 electrical characteristics (continued)(v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units minimum receive scl/sda risetime (note 3) t r 20 + 0.1c b ns maximum receive scl/sda falltime (note 3) t f 300 ns minimum receive scl/sda falltime (note 3) t f 20 + 0.1c b ns setup time for stop condition t su , sto 0.6 ? bus free time between a stopand start t buf 1.3 ? other digital pins dev_addr low level 0.8 v dev_addr high level 2.6 v interrupt_out low voltage interrupt_out sinking 1ma 0.15 0.4 v interrupt_out high leakagecurrent v interrupt_out = 5v 1 10 a slow switching input low level 02 v input medium level 4.5 7.0 v input high level 9.5 12.0 v input current 50 100 ? output low level r load = 10k ? to ground 0 1.5 v output medium level (external16/9) r load = 10k ? to ground 5.0 6.5 v output high level (external 4/3) r load = 10k ? to ground 10 12 v fast switching input low level 0 0.4 v input high level 13 v input current 11 0 a output low level i sink = 0.5ma 0 0.01 0.2 v output high level v_vid - v oh , i source = 20ma 0.75 2 v fast-switching output to rgbskew difference in propagation delays of fast-switching signal and rgb signals; measured from 50% input transition to 50% output transition 30 ns fast-switching output rise time r load = 150 ? to ground 30 ns fast-switching output fall time r load = 150 ? to ground 30 ns note 1: all devices are 100% tested at t a = +25?. all temperature limits are guaranteed by design. note 2: parameter guaranteed by design. note 3: c b = total capacitance of one bus line in pf. tested with c b = 400pf. downloaded from: http:///
max4399 audio/video switch for three scart connectors 6 _______________________________________________________________________________________ typical operating characteristics (v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? ceramic x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = +25?, unless otherwise noted.) rgb video large-signal bandwidth vs. frequency max4399 toc01 frequency (mhz) gain (db) 10 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 100 v in = 1v p-p r l = 150 ? to g_vid y video large-signal bandwidth vs. frequency max4399 toc02 frequency (mhz) gain (db) 10 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 100 v in = 1v p-p r l = 150 ? to g_vid rgb video small-signal bandwidth vs. frequency max4399 toc03 frequency (mhz) gain (db) 10 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 100 1000 v in = 100mv p-p r l = 150 ? to g_vid y video small-signal bandwidth vs. frequency max4399 toc04 frequency (mhz) gain (db) 10 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 100 v in = 100mv p-p r l = 150 ? to g_vid video crosstalk vs. frequency max4399 toc05 frequency (mhz) crosstalk (db) 10 1 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 0.1 100 v in = 100mv p-p r l = 150 ? to g_vid rf_cvbs_out (with trap filter) max4399 toc06 differential phase (deg) 13 24 5 6 7 13 24 5 6 7 differential gain (%) 0.20.1 0 -0.2 -0.1 0.20.1 0 -0.2 -0.1 r l = 150 ? to g_vid r l = 150 ? to g_vid rf_cvbs_out (without trap filter) max4399 toc07 differential phase (deg) differential gain (%) r l = 150 ? to g_vid r l = 150 ? to g_vid 0.20.1 0 -0.2 -0.1 0.20.1 0 -0.2 -0.1 13 24 5 6 7 13 24 5 6 7 tv_y/cvbs_out max4399 toc08 differential phase (deg) 13 24 5 6 7 13 24 5 6 7 differential gain (%) r l = 150 ? to g_vid r l = 150 ? to g_vid 0.50.3 0.1 -0.3 -0.1 0.20.1 0 -0.2 -0.1 -0.5 audio large-signal bandwidth vs. frequency max4399 toc09 frequency (khz) gain (db) 100 10 1 -15 -12 -9 -6 -3 0 3 -18 0.1 1000 v in = 0.5v rms r l = 10k ? to g_aud downloaded from: http:///
max4399 audio/video switch for three scart connectors _______________________________________________________________________________________ 7 audio thd+n vs. frequency max4399 toc11 frequency (khz) thd+n (%) 10 1 0.1 0.001 0.01 0.1 1 0.0001 0.01 100 v = 1.5v rms v = 1.0v rms v = 0.5v rms r l = 10k ? to g_aud audio crosstalk vs. frequency max4399 toc10 frequency (khz) crosstalk (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 v = 0.5v rms r l = 10k ? to g_aud 40 46 44 42 54 52 50 48 56 6058 0 2 55 07 5 v_vid quiescent supply current vs. temperature max4399 toc12 temperature ( c) v_vid quiescent supply current (ma) all video output amplifiers enabled 0 10 5 2015 25 30 0 2 55 07 5 v_vid standby quiescent supply current vs. temperature max4399 toc13 temperature ( c) v_vid standby supply current (ma) all video outputamplifiers disabled 0 0.60.4 0.2 0.8 1.0 1.2 1.4 1.6 1.8 2.0 02 5 50 75 v_dig quiescent supply current vs. temperature max4399 toc14 temperature ( c) v_dig supply current (ma) 0 10 5 2015 25 30 0 2 55 07 5 v12 quiescent supply current vs. temperature max4399 toc15 temperature ( c) v12 supply current (ma) v_aud vs. temperature max4399 toc16 temperature ( c) v_aud (v) 50 25 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 6.0 07 5 input clamp and bias level vs. temperature max4399 toc17 temperature ( c) input clamp and bias level (v) 50 25 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.50.5 07 5 bias bottom-levelclamp 1.0 2.52.0 1.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 02 5 50 75 input clamp current vs. temperature max4399 toc18 temperature ( c) input clamp current ( a) v in = 1.75v typical operating characteristics (continued) (v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? ceramic x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = +25?, unless otherwise noted.) downloaded from: http:///
max4399 audio/video switch for three scart connectors 8 _______________________________________________________________________________________ pin description pin name function 1 v_dig digital supply voltage. connect to 5v. 2 dev_addr device address set input. connect to g_dig to set write and read addresses of 94h and 95h,respectively. connect to v_dig to set write and read addresses of 96h and 97h, respectively. 3 sda bidirectional data i/o. i 2 c-compatible, 2-wire interface data input/output. output is open drain. 4 scl clock input. i 2 c-compatible, 2-wire interface clock. 5 interrupt_out interrupt output. interrupt_out is an open-drain output that goes high impedance toindicate a change in the slow switch lines, aux_ss, tv_ss, or vcr_ss. 6 g_dig digital ground 7 enc_l_in digital encoder left-channel audio input 8 st_aux_in satellite dish tone input 9 enc_r_in digital encoder right-channel audio input 10 aud_bias audio input bias voltage. bypass aud_bias with a 10? capacitor and a 0.1? capacitor tog_aud. 11, 22, 30 v_aud audio supply voltage. connect all v_aud together. an on-board linear regulator creates the+8v audio supply voltage from v12. bypass pin 30 with a 10? aluminum electrolytic capacitor in parallel with a 0.47? low-esr ceramic capacitor to audio ground, and bypass pins 11 and 22 with 0.1? capacitors to audio ground. 12 aux_l_in aux scart left-channel audio input 13 aux_r_in aux scart right-channel audio input 14 vcr_r_in vcr scart right-channel audio input 15 vcr_l_in vcr scart left-channel audio input 16 tv_r_in tv scart right-channel audio input typical operating characteristics (continued) (v v12 = 12v, v v_vid = 5v, v v_dig = 5v, 0.47? ceramic x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v_aud to g_aud, no load, t a = +25?, unless otherwise noted.) input clamp current vs. input voltage max4399 toc19 input voltage (v) input clamp current (ma) 4 3 2 1 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 05 output bias voltage vs. temperature max4399 toc20 temperature ( c) output bias voltage (v) 50 25 0.5 1.0 1.5 2.0 2.5 0 07 5 rgb, luma, cvbs chroma downloaded from: http:///
max4399 audio/video switch for three scart connectors _______________________________________________________________________________________ 9 pin name function 17 tv_l_in tv scart left-channel audio input 18, 26 g_aud audio ground 19 aux_l_out aux scart left-channel audio output 20 aux_r_out aux scart right-channel audio output 21 vcr_r_out vcr scart right-channel audio output 23 vcr_l_out vcr scart left-channel audio output 24 phono_r_out hi-fi right-channel audio output 25 phono_l_out hi-fi left-channel audio output 27 rf_mono_out rf modulator mono audio output 28 tv_l_out tv scart left-channel audio output 29 tv_r_out tv scart right-channel audio output 31 v12 +12v supply. bypass v12 with a 10? capacitor in parallel with a 0.1? capacitor to ground. 32 aux_ss aux scart bidirectional slow-switch signal 33 tv_ss tv scart bidirectional slow-switch signal 34 vcr_ss vcr scart bidirectional slow-switch signal 35 trap trap filter. connect a series rlc trap filter to eliminate the color subcarrier frequency (4.43mhz) from the luma signal. the filter prevents cross-mixing of the color subcarriers when the luma and chroma signals are added together to form a composite signal. internally biased at +0.5v. 36, 42, 50 g_vid video ground 37 tv_fs_out tv scart fast-switching output. this signal is used to switch the tv to its rgb inputs for on-screen display purposes. 38, 46, 61 v_vid video supply. bypass each v_vid with a 0.01? capacitor to v_gnd. connect a 200nh ferritebead from v_vid to a 5v supply. 39 rf_cvbs_out rf modulator composite video output. internally biased at 1.0v. 40 tv_y/cvbs_out tv scart luma/composite video output. internally biased at 1.0v. 41 tv_r/c_out tv scart red/chroma video output. internally biased at 1.0v for red video signal and 2.1vfor chroma video signal. 43 tv_g_out tv scart green video output. internally biased at 1.0v. 44 tv_b_out tv scart blue video output. internally biased at 1.0v. 45 aux_r/c_out aux scart red/chroma video output. internally biased at 1.0v for red video signal and 2.1v for chroma video signal. 47 aux_y/cvbs_out aux scart luma/composite video output. internally biased at 1.0v. 48 vcr_y/cvbs_out vcr scart luma/composite video output. internally biased at 1.0v. 49 vcr_r/c_out vcr scart red/chroma video output. internally biased at 1.0v for red video signal and 2.1v for chroma video signal. 51 vid_bias video bias voltage output. vid_bias sets video bias level for chroma signals. bypassvid_bias with a low-esr 0.1? capacitor to g_vid. 52 tv_r/c_in tv scart red/chroma video input. internally biased at 1.22v for red, or 1.8v for chroma. pin description (continued) downloaded from: http:///
max4399 detailed description the max4399 audio/video switch matrix connects audioand video signals between different ports. in the case of a set-top box, the ports consist of the mpeg decoder and three scart connectors. for dvd+rw recorders and some televisions, the ports consist of the main board, front panel, tuner, and two scart connectors. the video section consists of input buffers, a crosspoint switch, and output drivers that can be disabled. there is also a mixer, which creates a composite video signal from s-video. the video inputs can be set in either clamp or bias mode. the red/chroma outputs have pull- downs that connect the outputs to video ground as described in the video inputs section. the audio section features input buffers, a crosspointswitch, and output drivers. the tv audio path has vol- ume control from -56db to +6db in 2db steps. the vcr and aux audio paths have volume control from -6db to +6db in 6db steps. the max4399 can be configured to switch inputs during a zero crossing to reduce clicks. the max4399 can also switch volume levels during a zero crossing to reduce zipper noise. the audio out- puts can operate in different modes. for instance, left and right audio channels can be swapped (see the audio outputs section). the max4399 has two fast-switching inputs and onefast-switching output. fast switching is used for creat- ing on-screen displays by switching between the cvbs and rgb signals. under i 2 c-compatible control, the fast-switching output can follow either of the fast-switching inputs or be set high or low. the max4399 features three slow-switching input/out- puts to support slow switching, which sets the screen aspect ratio or video source of the display device. the slow switching relies on tri-level logic in which the levels are 0v, 6v, and 12v. the status of the slow-switching input is continuously read and stored in register 0eh. if interrupt_out is enabled, then interrupt_out changes to a high-impedance state if any of the slow- switching inputs change logic levels. the slow-switching outputs can be set to a logic level or high impedance by writing to registers 07h, 09h, or 0bh. the max4399 can be configured through an i 2 c-com- patible interface. dev_addr sets the i 2 c-compatible address. scart video switching the max4399 triple scart audio/video switchincludes multiplexed video amplifiers and a y-c mixer- driver with a trap filter to drive an rf modulator. the max4399 switches video from an mpeg decoder out- put and tv, vcr, and aux scart connectors. audio/video switch for three scart connectors 10 ______________________________________________________________________________________ pin description (continued) pin name function 53 tv_y/cvbs_in tv scart luma/composite video input. internally biased at 1.22v. 54 aux_r/c_in aux scart red/chroma video input. internally biased at 1.22v for red, or 1.8v for chroma. 55 aux_y/cvbs_in aux scart luma/composite video. internally biased at 1.22v. 56 vcr_y/cvbs_in vcr scart luma/composite video input. internally biased at 1.22v. 57 vcr_fs_in vcr scart fast-switching input 58 vcr_r/c_in vcr scart red/chroma video input. internally biased at 1.22v for red, or 1.8v for chroma. 59 vcr_g_in vcr scart green video input. internally biased at 1.22v. 60 vcr_b_in vcr scart blue video input. internally biased at 1.22v. 62 enc_y/cvbs_in digital encoder luma/composite video input. internally biased at 1.22v. 63 enc_r/c_in digital encoder red/chroma video input. internally biased at 1.22v for red, or 1.8v for chroma. 64 enc_g_in digital encoder green video input. internally biased at 1.22v. 65 enc_b_in digital encoder blue video input. internally biased at 1.22v. 66 enc_y_in digital encoder luma video input. internally biased at 1.22v. 67 enc_c_in digital encoder chroma video input. internally biased at 1.8v. 68 enc_fs_in digital encoder fast-switching input downloaded from: http:///
the inputs and outputs are grouped by scart connec-tors: tv, vcr, and aux. while the scart connector supports rgb, s-video, and composite formats, rgb and s-video share a bidirectional set of scart connec- tor pins. the max4399 supports connection of auxiliary devices (dvd players, dvd+r/w recorders, game con- soles, camcorders, etc.) by including full i/o support for an auxiliary (aux) scart connector. video inputs all of the video amplifier inputs are ac-coupled with anexternal 0.1? capacitor. either a clamp or bias circuit sets the dc input level of the video signals. the clamp circuit positions the sync tip of the cvbs, rgb, or luma (s-vhs) signals. if the signal does not have sync, then the clamp positions the minimum of the signal at the clamp voltage. the bias circuit positions the chroma sig- nal (s-vhs) at its midlevel. on the video inputs that can receive either a chroma or a red video signal, the 2-wire interface sets whether the clamp or bias circuit is active. red/chroma signals, such as tv_r/c_out signals are bidirectional. when the red/chroma signal is being used as an input, then the red/chroma output must con- nect the 75 ? back-termination resistor to ground, as shown in figure 1, so the transmitting device can see the proper termination on the receiving side. the max4399 provides an active pulldown to g_vid on allred/chroma outputs (aux_r/c_out, tv_r/c_out, and vcr_r/c_out). the mpeg decoder and vcr uses the rgb format to insert an on-screen display (osd), usually text, onto the tv. a fast-switching signal controls whether the rgb signals or composite video signal appear on the tv. the max4399 supports rgb as an input from either the vcr or the mpeg decoder and as an output only to the tv. the red video signal of the rgb format and the chroma video signal of the s-vhs format share the same scart connector pin; therefore rgb signals and s-vhs signals cannot be present at the same time. loop-through is possible with a composite video signal but not with rgb signals because the rgb scart pins are used for both input and output. the vcr, mpeg decoder, auxiliary device, and tv use the s-vhs format, which is the high-quality format for the home today. the max4399 supports s-vhs as an input from the vcr, mpeg decoder, auxiliary device, and tv, and as a separately switchable output to the tv, vcr, and aux scart connectors. because s-vhs support was not included in the original specification of the scart connector, the y signal of s-vhs and the cvbs signal share the same scart connector pins. if s-vhs is present, then a composite signal must be created max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 11 clamp/bias clamp n clamp/bias clamp n tv_r/c_in video input tv_r/c_invideo input pin 15pin 13 75 ? 0.1 f 0.1 f 75 ? pin 15pin 13 max4399 max4399 vga 5db, 6db, 7db vga 5db, 6db, 7db tv_r/c_out tv_r/c_out pull- down pull-down scart cable scart connectors figure 1. bidirectional scart pins downloaded from: http:///
max4399 from the y and c signals to drive the legacyrf_cvbs_out output. the circuit is shown as a sum- ming point with bias in figure 2. the max4399 sums y and c to get cvbs, and the bias provides the dc levelsfor offsetting the chroma signal. again, loop-through is not possible with s-vhs because the chroma scart pin is used for both input and output. the max4399 supports the cvbs format, with inputs from the vcr, mpeg decoder, tv, and auxiliary device. full loop-through is possible to all devices except the mpeg decoder because the scart connector has separate input and output pins for the cvbs format. slow switching the max4399 supports the tri-level slow switching ofiec 933-1, amendment 1, which selects the aspect ratio for the display device. under i 2 c-compatible control, the max4399 sets the slow-switching output levels. table1 shows the valid output levels of the slow-switching signal and the corresponding operating modes of the display device. the slow-switching scart pins are bidirectional. the max4399 can set the slow-switch output drivers to high- impedance mode to receive signals. when enabled, interrupt_out becomes high impedance if the voltage level changes on tv_ss, vcr_ss, or aux_ss. the vcr or mpeg decoder outputs a fast-switching signal to the display device. the fast-switching signal can also be set to a constant high or low through the 2- wire interface. the pass-through delay from vcr to tv or mpeg decoder to tv matches that of the rgb sig- nals facilitating proper osd insertion. video outputs the dc level at the video outputs is controlled so cou-pling capacitors are not required, and all of the video outputs are capable of driving a 150 ? , back-terminated coax load directly with respect to ground. since sometelevisions and vcrs use the horizontal sync height for automatic gain control, the max4399 accurately repro- duces the sync height to within 2%. y/c mixer and trap filter the max4399 includes an on-chip mixer to producecvbs from y and c. the y signal input to the mixer has an external trap filter connection, trap, to eliminate the color subcarrier frequency (4.43mhz), preventing cross-mixing of the subcarriers in the mixer. trap is internally biased at 0.5v. connect a series rlc filter to g_vid, or leave trap unconnected if not used. scart audio switching audio inputs the audio block has four stereo audio inputs from the tv,vcr, and aux scart connectors, plus the mpeg decoder. additionally, the max4399 provides a satellite tone input. each input has a 100k ? resistor connected to an internally generated voltage equal to 0.5 x v_aud.there are three main sections?he tv channel, the vcr channel, and the aux channel. audio outputs each channel has a stereo output and the tv channelhas an additional phono output and a mono output. the phono outputs always follow the tv audio input selec- tion. the mono output, a mix of the tv right and left channels, drives the channel 3/4 rf modulator. the three stereo outputs can be configured to normal mode, swap mode, mono, both channels to right input, and both channels to left input. the latter two modes are useful if the left audio channel carries one language and the right audio channel carries another language. the phono output is ideal for connection to a hi-fi, and carries the same signals as the tv output when switched to normal mode. the mono mixer, a resistor summer, attenuates the amplitude of each of the two signals by 6db. the 3db gain block, which follows the mono mixer (figures 3 and 4), is a compromise between a 0db gain block and a 6db gain block. if the left and right audio channels were completely uncorrelated, then a 6db gain block could be used. if the left and right channels were com- pletely correlated, then a 0db block would have to be used. in reality, most stereo audio channels are partial- ly correlated and hence a 3db gain block was used. audio/video switch for three scart connectors 12 ______________________________________________________________________________________ slow-switching signal voltage (v) mode 0 to 2 display device uses an internalsource such as a built-in tuner to provide a video signal 4.5 to 7 display device uses a video signalfrom the scart connector and sets the display to 16:9 aspect ratio 9.5 to 12.6 display device uses a signal from ascart connector and sets the display to 4:3 aspect ratio table 1. slow switch modes downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 13 clamp/bias tv_r/c_in clamp tv_y/cvbs_in clamp aux_y/cvbs_in clamp/bias aux_r/c_in clamp vcr_b_in clamp vcr_g_in clamp/bias vcr_r/c_in vcr_fs_in clamp vcr_y/cvbs_in clamp enc_y/cvbs_in clamp/bias enc_r/c_in clamp enc_g_in clamp enc_b_in clamp enc_y_in enc_fs_in bias enc_c_in 0.7v 0.7v 2k ? 2k ? vcr_y/cvbs_outvcr_r/c_out aux_y/cvbs_out aux_r/c_out tv_r/c_out tv_g_out tv_b_out tv_y/cvbs_out tv_fs_out rf_cvbs_out bias 5v 0v trap pulldown tv_r/c_out vga 5db, 6db, or 7db pulldown aux_r/c_out pulldown vcr_r/c_out 6db 6db 6db 6db 6db 6db vga 5db, 6db, or 7db vga 5db, 6db, or 7db n n n mixer max4399 figure 2. max4399 video section functional diagram downloaded from: http:///
max4399 audio/video switch for three scart connectors 14 ______________________________________________________________________________________ 0db 0db 0db mutemute 0db mute 0db 0db 3db 0db 6db 0db mute tv_l_in vcr_l_inaux_l_in enc_l_in vcr_r_in tv_r_in aux_r_in enc_r_in st_aux_in vaud/2 vaud/2 phono_l_outtv_l_out rf_mono_out tv_r_out phono_r_out 0db0db 0db 0db 0db0db 0db 0db zcd 6db mute zcd mute mute volume control +6db to -56db 2db steps volume control +6db to -56db 2db steps zcd vcr_lb tv_lb aux_lb enc_lb sten_lb vcr_rb tv_rb aux_rb enc_rb sten_rb to audioblock 2 to audioblock 2 input source switches input source switches volume bypass switches tv mono switches tv mono switches volume bypass switches max4399 figure 3. max4399 audio functional diagram (audio block 1) downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 15 vcr_l_outvcr_r_out aux_l_out aux_r_out tv_lb vcr_lbaux_lb enc_lb mute vaud/2 tv_rb vcr_rb aux_rb enc_rb mute vaud/2 from buffer outputs on audio block 1 0db 0db 0db 0db tv_lb vcr_lbaux_lb enc_lb mute vaud/2 tv_rb vcr_rb aux_rb enc_rb mute vaud/2 -6db, 0db, 6db volume control -6db, 0db, 6db volume control -6db, 0db, 6db volume control -6db, 0db, 6db volume control from buffer outputs on audio block 1 0db 0db 0db 0db sten_lb sten_rb sten_lb sten_rb 3db3db input source switches input source switches input source switches input source switches vcr mono switches vcr mono switches aux mono switches aux mono switches max4399 figure 4. audio functional diagram (audio block2) downloaded from: http:///
max4399 zero-cross (clickless) switching the tv channel incorporates a zero-crossing detect(zcd) circuit that minimizes click noise due to abrupt signal level changes that occur when switching between audio signals at an arbitrary moment in time. to implement the zero-cross function when switching audio signals, set the zcd bit by loading register 00h through the i 2 c-compatible interface (if the zcd bit is not already set). then set the mute bit high by loadingregister 00h. next, wait for a period of time long enough for the audio signal to cross zero. this period is a func- tion of the audio signal path? low frequency 3db cor- ner (f l3db ). for example, if f l3db = 20hz, the time period to wait for zero cross is 1/20hz or 50ms. next,set the appropriate tv switches using register 01h. finally, clear the mute bit (while leaving the zcd bit high) using register 00h. the max4399 switches the signal out of mute at the next zero crossing. to implement the zero-cross function for tv volume changes, or for tv and phono volume bypass switch- ing, simply ensure the zcd bit in register 00h is set. volume control the tv channel volume control ranges from -56db to+6db in 2db increments. the vcr and aux volume control settings are programmable for -6db, 0db, and +6db. with the zcd bit set, the tv volume control switches only at zero crossings, thus minimizing click noise. the tv outputs can bypass the volume control. while the phono outputs always follow the tv audio input selection, the phono outputs can either be processed through the tv volume control or they can bypass the tv volume control. digital section serial interface the max4399 uses a simple 2-wire serial interfacerequiring only two i/o lines (2-wire bus) of a standard microprocessor (?) port. the fast-mode i 2 c-compati- ble serial interface allows communication at data ratesup to 400kbps. figure 5 shows the timing diagram for signals on the 2-wire bus.the two bus lines (sda and scl) must be high when the bus is not in use. the max4399 is a slave device and must be controlled by a bus master device. figure 6 shows a typical application where multiple devices can be connected to the bus provided they have different address settings. external pullup resistors are not neces- sary on these lines (when driven by push-pull drivers), though the max4399 can be used in applications where pullup resistors are required to maintain compatibility with existing circuitry. the serial interface operates at scl rates up to 400khz. the sda state is allowed to change only while scl is low, with the exception of start and stop conditions as shown in figure 7. sda? state is sampled, and therefore must remain sta- ble while scl is high. data is transmitted in 8-bit bytes. nine clock cycles are required to transfer each byte to the max4399. release sda during the 9th clock cycle as the selected device acknowledges the receipt of the byte, by pulling sda low during this time. a series resistor on the sda line may be needed if the master? output is forced high while the selected device acknowledges (figure 6). audio/video switch for three scart connectors 16 ______________________________________________________________________________________ scl sda t low t high t f t r t hd , sta t hd , dat t hd , sta t su , dat t su , sta t buf t su , sto start condition stop condition repeated start condition start condition figure 5. timing diagram for sda and scl signals downloaded from: http:///
i 2 c compatibility the max4399 is compatible with existing i 2 c systems. scl and sda are high-impedance inputs. sda has anopen drain that pulls the data line low during the 9th clock pulse. figure 8 shows a typical i 2 c interface application. the communication protocol supports thestandard i 2 c 8-bit communications. the general call address is ignored, and cbus formats are not supported.the max4399 address is compatible with the 7-bit i 2 c addressing protocol only. no 10-bit formats are support-ed. restart protocol is supported, but an immediate stop condition is necessary to update the max4399. digital inputs and interface logic the i 2 c-compatible, 2-wire interface has logic levels defined as v ol = 0.8v and v oh = 2.0v. all of the inputs include schmitt-trigger buffers to accept slow-transitioninterfaces. the digital inputs are compatible with 3v cmos logic levels. interrupt_out signal interrupt_out is an open-drain output thatbecomes high impedance when a change in any of the slow-switch signals occurs. clear interrupt_out by setting bit 3 of register 04h low. data format of the 2-wire interface write moderead mode where s = start condition, a = acknowledge, p = stop condition. s slave address a register address a data a p s slave address a register address a data a p max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 17 c sda scl r s * v dd r s * is optional. scl sda v_dig max4399 scl sda v dd other device #1 scl sda v dd other device #2 figure 6. multiple devices controlled by a 2-wire interface scl sda start condition stop condition figure 7. start and stop conditions on a 2-wire interface c sda scl v dd scl sda v_dig max4399 scl sda v dd other device #1 scl sda v dd other device #2 figure 8. a typical i 2 c interface application downloaded from: http:///
max4399 2-wire interface slave address programming connect dev_addr to g_dig or v_dig to set themax4399 write and read addresses as shown in table 2. data register writing and reading program the scart video and audio switches by writ-ing to registers 00h through 0dh (tables 3 through 18). registers 00h through 0dh can also be read, allowing read-back of data after programming and facilitating system debugging. the status register is read-only and can be read from address 0eh (table 19). applications information filtering of encoder outputs the dac outputs of encoder chips need to beprocessed through a lowpass filter (reconstruction filter) to attenuate out-of-band noise. figure 9 shows how the max7440 provides an integrated, convenient solution for reconstruction filtering. audio/video switch for three scart connectors 18 ______________________________________________________________________________________ dev_addr connection write address read address g_dig 94h 95h v_dig 96h 97h table 2. slave address programming register address por value bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 00h 47h not used zcd volume control tv audio mute 01h 07h not used not used tv mono switch tv audio selection 02h 07h vcr volume control vcr mono switch vcr audio selection 03h 07h aux volume control aux mono switch aux audio selection 04h 01h not used not used not used not used interrupt enable tv volume bypass phono volume bypass not used 05h 00h enc_r/c_in clamp not used not used not used not used not used not used not used 06h 1fh tv_r/c_in clamp rgb gain tv g and b video switch tv video switch 07h 20h not used rf_cvbs_out switch tv_y/cvbs_ out switch tv fast switch tv_r/c_out ground set tv slow switch 08h 07h vcr_r/c_in clamp not used not used not used not used vcr video switch 09h 00h not used not used not used not used not used vcr_r/c_ out ground set vcr slow switch 0ah 07h aux_r/c_in clamp not used not used not used not used aux video switch 0bh 00h not used not used not used not used not used aux_r/c_ out ground set aux slow switch 0ch 00h not used not used not used not used not used not used v c r_y / c v bs _ ou t enab l e vcr_r/ c_out enable 0dh 00h aux_y/cvbs_ out enable aux_r/c_out enable tv_r/c_out enable tv_g_out enable tv_b_out enable tv_y/cvbs_ out enable tv_fb_ out enable rf_cvbs_ out enable table 3. write mode input data format downloaded from: http:///
hot-plug of scart connectorsfloating chassis discharge the max4399 features high-esd protection on allscart inputs and outputs, and requires no external transient voltage suppressor (tvs) devices to protect against floating chassis discharge. some set-top boxes have a floating chassis problem in which the chassis is not connected to earth ground. as a result, the chassis can charge up to 500v. when a scart cable is con- nected to the scart connector, the charged chassiscan discharge through a signal pin. the equivalent cir- cuit is a 2200pf capacitor charged to 311v connected through less than 0.1 ? to a signal pin. the max4399 is soldered on the pc board when it experiences such adischarge. therefore, the current spike flows through the esd protection diodes and is absorbed by the sup- ply bypass capacitors, which have high capacitance and low esr. max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 19 clamp lowpass filter d/a cvbs a = +1v/v in1 out1 0.1 f enc_y/cvbs_in clamp lowpass filter d/a y a = +1v/v in2 out2 0.1 f enc_y_in bias lowpass filter d/a c a = +1v/v in3 out3 0.1 f enc_c_in clamp lowpass filter d/a r a = +1v/v in4 out4 0.1 f enc_r/c_in clamp lowpass filter d/a g a = +1v/v in5 out5 0.1 f enc_g_in clamp lowpass filter d/a b a = +1v/v in6 out6 0.1 f enc_b_in mpeg decoder max7440 max4399 g_vid +5v v_vid +5v 0.1 f1 f figure 9. mpeg decoder outputs filtered by the max7440 before being passed to the max4399 downloaded from: http:///
max4399 audio/video switch for three scart connectors 20 ______________________________________________________________________________________ 68 enc_fs_in 67 enc_c_in_sc 66 enc_y_in_sc 65 enc_b_in_sc 64 enc_g_in_sc 63 enc_r/c_in_sc 62 enc_y/cvbs_in_sc 61 60 vcr_b_in_sc 59 vcr_g_in_sc 58 vcr_r/c_in_sc 57 vcr_fs_in_sc 56 vcr_y/cvbs_in_sc 55 aux_y/cvbs_in_sc 54 aux_r/c_in_sc 53 tv_y/cvbs_in_sc 52 tv_r/c_in_sc 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 5144 43 42 41 40 39 38 37 36 35 5049 48 47 46 45 18 9 1011 12 13 14 15 16 17 23 4 5 6 7 g_audaux_l_out aux_r_out vcr_r_out v_aud vcr_l_out phono_r_out phono_l_out g_aud rf_mono_out tv_l_out tv_r_out v_aud v12 aux_ss tv_ss vcr_ss enc_fs_in enc_c_in enc_y_inenc_b_in enc_g_in enc_r/c_in enc_y/cvbs_in v_vid vcr_b_in vcr_g_in vcr_r/c_in vcr_fs_in vcr-y/cvbs_in aux_y/cvbs_in aux_r/c_in tv_y/cvbs_in tv_r/c_in v_digst_aux_in enc_r_in aud_bias v_aud aux_l_in aux_r_in vcr_r_in vcr_l_in tv_r_in tv_l_in dev_addrsda scl interrupt_out g_dig enc_l_in vid_bias tv_b_out tv_g_out g_vid tv_r/c_out tv_y/cvbs_out rf_cvbs_out v_vid tv_fs_out g_vid trap g_vid vcr_r/c_out vcr_y/cvbs_outaux_y/cvbs_out v_vid aux_r/c_out 10 f vcr_r/c_out_scvcr_y/cvbs_out_sc aux_y/cvbs_out_sc 0.01 f 0.01 f 200nh 10 f +5v video supply 0.01 f aux_r/c_out_sctv_b_out_sc tv_g_out_sc tv_r/c_out_sctv_y/cvbs_out_sc rf_cvbs_out_sc tv_fs_out_sc 1.8k ? 22 h 22pf 10k ? aux_l_in_sc 10k ? aux_r_in_sc 10k ? vcr_r_in_sc 10k ? vcr_l_in_sc 10k ? tv_r_in_sc 10k ? tv_l_in_sc 10k ? enc_l_in_sc 10k ? st_aux_in_sc 10k ? enc_r_in_sc 10 f 0.1 f +5v digital supply dev_addr sda scl interrupt_out max4399 aux_l_out_sc 10 f aux_r_out_sc 10 f vcr_r_out_sc 10 f vcr_l_out_sc 10 f phono_r_out_sc 10 f phono_l_out_sc 10 f rf_mono_out_sc 10 f tv_l_out_sc 10 f tv_r_out_sc 10 f 10 f 10 f 0.47 f +12v aux_ss tv_ss vcr_ss 10k ? 10k ? 10k ? all capacitors are 0.1 f and all resistors are 75 ? , unless otherwise noted. figure 10. floating chassis discharge protection circuit downloaded from: http:///
to better protect the max4399 against excessive volt-ages during the cable discharge event, additional 75 ? resistors should be placed in series with all inputs andoutputs that go to the scart connector ( figure 10). for harsh environments needing ?5kv protection, themax4385e and max4386e single and quad high- speed op amps feature the industry? first integrated ?5kv esd protection on video inputs and outputs. power supplies and bypassing the max4399 features single +5v and +12v supplyoperation, and requires no negative supply. the +12v supply provides voltage for scart function switching, and provides power for the internally generated audio supply, v_aud. place all bypass capacitors as close as possible to the max4399. bypass v12 to ground with a 10? capacitor in parallel with a 0.1? ceramic capacitor. connect all v_aud pins together and bypass pin 30 with a 10? electrolytic capacitor in par- allel with a 0.47? low-esr ceramic capacitor to audio ground. bypass v_aud pins 11 and 22 each with a 0.1? capacitor to audio ground. bypass aud_bias to audio ground with a 10? electrolytic in parallel with a0.1? ceramic capacitor. bypass v_dig with a 0.1? ceramic capacitor to digital ground. bypass each v_vid to video ground with a 0.01? ceramic capacitor. connect v_vid in series with a 200nh ferrite bead to the +5v supply. bypass the internally generated video bias, vid_bias with a 0.1? low-esr ceramic capacitor to g_vid. layout and grounding for optimal performance, use controlled-impedancetraces for video signal paths, and place input termina- tion resistors and output back-termination resistors close to the max4399. avoid running video traces par- allel to high-speed data lines. the max4399 provides separate ground connections for video, audio, and digital supplies. for best performance use separate ground planes for each of the ground returns, and connect all three ground planes together at a single point. refer to the max4399 evaluation kit for a proven circuit board layout example. max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 21 read mode: output data formattable 4. read mode output data format register address bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0eh not used power-on reset aux slow switch status vcr slow switch status tv slow switch status write mode: description of registerstable 5. register 00h: audio control bit description 76543210 comments 0off tv audio mute 1 on (power-on default) 0 0 0 0 0 +6db gain 0 0 0 0 1 +4db gain 0 0 0 1 0 +2db gain 0 0 0 1 1 0db gain (power-on default) 0 0 1 0 0 -2db gain 0 0 1 0 1 -4db gain 1 1 1 1 0 -54db gain volume control 1 1 1 1 1 -56db gain 0 off zero-crossing detector 1 on (power-on default) downloaded from: http:///
max4399 audio/video switch for three scart connectors 22 ______________________________________________________________________________________ table 6. register 01h: tv audio bit description 76543210 comments 0 0 0 encoder audio 0 0 1 vcr audio 0 1 0 aux audio 0 1 1 tv audio 1 0 0 encoder audio + tones 1 0 1mute 1 1 0mute input source for tv audio 1 1 1 mute (power-on default) l channel output r channel output 0 0 0 l r normal (power-on default) 0 0 1 r+l r+l mono mix 0 1 0 r l swap 0 1 1 r r r channel only 1 0 0 l l l channel only 1 0 1 l r normal 1 1 0 l r normal tv mono switch settings 1 1 1 l r normal downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 23 table 7. register 02h: vcr audio bit description 76543210 comments 0 0 0 encoder audio 0 0 1 vcr audio 0 1 0 aux audio 0 1 1tv audio 1 0 0 encoder audio + tones 1 0 1 mute 1 1 0 mute input source for vcr audio 1 1 1mute ( power-on default) l channel output r channel output 000 l r normal (power-on default) 0 0 1 r+l r+l mono mix 0 1 0 r l swap 011 r r r-channel only 100 l l l-channel only 1 0 1 l r normal 1 1 0 l r normal vcr mono switch settings 1 1 1 l r normal 0 0 0db (power-on default) 0 1 +6db 1 0 0db vcr volume control 1 1 -6db downloaded from: http:///
max4399 audio/video switch for three scart connectors 24 ______________________________________________________________________________________ table 8. register 03h: aux audio bit description 76543210 comments 0 0 0 encoder audio 0 0 1 vcr audio 0 1 0 aux audio 0 1 1tv audio 1 0 0 encoder audio + tones 1 0 1mute 1 1 0mute input source for aux audio 1 1 1mute ( power-on default) l channel output r channel output 0 0 0 l r normal (power-on default) 0 0 1 r+l r+l mono mix 0 1 0 r l swap 0 1 1 r r r channel only 1 0 0 l l l channel only 1 0 1 l r normal 1 1 0 l r normal aux mono switch settings 1 1 1 l r normal 0 0 0db (power-on default) 0 1 +6db 1 0 0db aux volume control 1 1 -6db downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 25 table 9. register 04h: volume control bypass bit description 7 6 54321 0 comments 0 phono audio passes through volumecontrol (power-on default) phono volume bypass 1 phono audio bypasses volume control 0 tv audio passes through volume control(power-on default) tv volume bypass 1 tv audio bypasses volume control 0 clear interrupt_out (power-ondefault) interrupt enable 1 enable interrupt_out table 10. register 05h: encoder video input control bit description 76543210 comments 0 dc restore clamp active at input(power-on default) enc_r/c_in clamp/bias 1 chroma bias applied at input table 11. register 06h: tv video input control bit description 76543210 comments tv_y/cvbs_out tv_r/c_out 0 0 0 enc_y/cvbs_in enc_r/c_in 0 0 1 enc_y_in enc_c_in 0 1 0 vcr_y/cvbs_in vcr_r/c_in 0 1 1 aux_y/cvbs_in aux_r/c_in 1 0 0 tv_y/cvbs_in tv_r/c_in 1 0 1 mute mute 1 1 0 mute mute input sources for tv video 1 1 1 mute (power-on default) mute (power-on default) tv_g_out tv_b_out 0 0 enc_g_in enc_b_in 0 1 vcr_g_in vcr_b_in 1 0 mute mute input sources for tv_g_out andtv_b_out 1 1 mute (power-on default) mute (power-on default) 0 0 6db (power-on default) 0 1 7db 1 0 5db rgb gain 1 1 5db 0 dc restore clamp active at input (power- on default) tv_r/c_in clamp/bias 1 chroma bias applied at input downloaded from: http:///
max4399 audio/video switch for three scart connectors 26 ______________________________________________________________________________________ table 12. register 07h: tv video output control bit description 76543210 comments 0 0 low (<2v) internal source (power-ondefault) 0 1 medium (4.5v to 7v). external scartsource with 16:9 aspect ratio. 1 0 high impedance set tv slow switching 1 1 high (>9.5v). external scart sourcewith 4:3 aspect ratio. 0 normal operation. pulldown on tv_r/c_out is off (power-on default). tv_r/c_out ground 1 ground. pulldown on tv_r/c_out ison. the output amplifier driving tv_r/c_out turns off. 0 0 0 (power-on default) 0 1 same level as enc_fs_in 1 0 same level as vcr_fs_in fast switching 1 1 v_vid 0 composite video from the y/c mixer isoutput tv_y/cvbs_out switch 1 the tv_y/cvbs_out signal selected inregister 06h is output (power-on default) 0 composite video from the y/c mixer isoutput (power-on default) rf_cvbs_out switch 1 the tv_y/cvbs_out signal selected inregister 06h is output table 13. register 08h: vcr video input control bit description 76543210 comments vcr_y/cvbs_out vcr_r/c_out 0 0 0 enc_y/cvbs_in enc_r/c_in 0 0 1 enc_y_in enc_c_in 0 1 0 vcr_y/cvbs_in vcr_r/c_in 0 1 1 aux_y/cvbs_in aux_r/c_in 1 0 0 tv_y/cvbs_in tv_r/c_in 1 0 1 mute mute 1 1 0 mute mute input sources for vcr video 1 1 1 mute (power-on default) mute (power-on default) 0 dc restore clamp active at input (power-on default) vcr_r/c_in clamp/bias 1 chroma bias applied at input downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 27 table 14. 09h: vcr video output control bit description 76543210 comments 0 0 low (<2v) internal source (power-ondefault) 0 1 medium (4.5v to 7v). external scartsource with 16:9 aspect ratio. 1 0 high impedance set vcr slow switching 1 1 high (>9.5v). external scart source with4:3 aspect ratio. 0 normal operation. pulldown on tv_r/c_out is off (power-on default) vcr_r/c_out ground 1 ground. pulldown on tv_r/c_out is on.the output amplifier driving vcr_r/c_out turns off. table 15. register 0ah: aux video input control bit description 76543210 comments aux_y/cvbs_out aux_r/c_out 0 0 0 enc_y/cvbs_in enc_r/c_in 0 0 1 enc_y_in enc_c_in 0 1 0 vcr_y/cvbs_in vcr_r/c_in 0 1 1 aux_y/cvbs_in aux_r/c_in 1 0 0 tv_y/cvbs_in tv_r/c_in 1 0 1 mute mute 1 1 0 mute mute input sources for aux video 1 1 1 mute (power-ondefault) mute (power-ondefault) 0 dc restore clamp active at input (power-on default) aux_r/c_in clamp/bias 1 chroma bias applied at input table 16. register 0bh: aux video output control bit description 76543210 comments 0 0 low (<2v). internal source (power-ondefault). 0 1 medium (4.5v to 7v). external scartsource with 16:9 aspect ratio. 1 0high i mpedance set aux slow switching 1 1 high (>9.5v). external scart sourcewith 4:3 aspect ratio. 0 normal operation. pulldown on tv_r/c_out is off (power-on default). aux_r/c_out ground 1 ground. pulldown on tv_r/c_out ison. the output amplifier driving aux_r/c_out turns off. downloaded from: http:///
max4399 audio/video switch for three scart connectors 28 ______________________________________________________________________________________ table 17. register 0ch: output enable bit description 765 432 1 0 comments 0 off (power-on default) vcr_r/c_out 1on 0 off (power-on default) vcr_y/cvbs_out 1 on table 18. register 0dh: output enable bit description 76543210 comments 0off ( power-on default) rf_cvbs_out 1on 0 off ( power-on default) tv_fs_out 1 on 0 off ( power-on default) tv_y/cvbs_out 1 on 0 off ( power-on default) tv_b_out 1 on 0 off ( power-on default) tv_g_out 1 on 0 off ( power-on default) tv_r/c_out 1 on 0 off ( power-on default) aux_r/c_out 1 on 0 off ( power-on default) aux_y/cvbs_out 1 on downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 29 read mode: description of registertable 19. register 0eh: status bit description 76543210 comments 0 00 to 2v; internal source 0 1 4.5v to 7v; external source with 16:9aspect ratio 1 0not used tv slow switch status 1 1 9.5v to 12.6v; external source with 4:3aspect ratio 0 0 0 to 2v; internal source 0 1 4.5v to 7v; external source with 16:9aspect ratio 1 0 not used vcr slow switch status 1 1 9.5v to 12.6v; external source with 4:3aspect ratio 0 0 0 to 2v; internal source 0 1 4.5v to 7v; external source with 16:9aspect ratio 1 0 not used aux slow switch status 1 1 9.5v to 12.6v; external source with 4:3aspect ratio 0 v_dig is too low for digital logic tooperate power-on reset 1 v_dig is high enough for digital logic tooperate downloaded from: http:///
max4399 audio/video switch for three scart connectors 30 ______________________________________________________________________________________ 68 enc_fs_in 67 enc_c_in_sc 66 enc_y_in_sc 65 enc_b_in_sc 64 enc_g_in_sc 63 enc_r/c_in_sc 62 enc_y/cvbs_in_sc 61 60 vcr_b_in_sc 59 vcr_g_in_sc 58 vcr_r/c_in_sc 57 vcr_fs_in_sc 56 vcr_y/cvbs_in_sc 55 aux_y/cvbs_in_sc 54 aux_r/c_in_sc 53 tv_y/cvbs_in_sc 52 tv_r/c_in_sc 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 5144 43 42 41 40 39 38 37 36 35 5049 48 47 46 45 18 9 1011 12 13 14 15 16 17 23 4 5 6 7 g_audaux_l_out aux_r_out vcr_r_out v_aud vcr_l_out phono_r_out phono_l_out g_aud rf_mono_out tv_l_out tv_r_out v_aud v12 aux_ss tv_ss vcr_ss enc_fs_in enc_c_in enc_y_inenc_b_in enc_g_in enc_r/c_in enc_y/cvbs_in v_vid vcr_b_in vcr_g_in vcr_r/c_in vcr_fs_in vcr-y/cvbs_in aux_y/cvbs_in aux_r/c_in tv_y/cvbs_in tv_r/c_in v_digst_aux_in enc_r_in dev_addrsda scl interrupt_out g_dig enc_l_in vid_bias tv_b_out tv_g_out g_vid tv_r/c_out tv_y/cvbs_out rf_cvbs_out v_vid tv_fs_out g_vid trap g_vid vcr_r/c_out vcr_y/cvbs_outaux_y/cvbs_out v_vid aux_r/c_out 10 f vcr_r/c_out_scvcr_y/cvbs_out_sc aux_y/cvbs_out_sc 0.01 f 0.01 f 200nh 10 f +5v video supply 0.01 f aux_r/c_out_sctv_b_out_sc tv_g_out_sc tv_r/c_out_sctv_y/cvbs_out_sc rf_cvbs_out_sc tv_fs_out_sc 1.8k ? 22 h 10k ? aux_l_in_sc 10k ? aux_r_in_sc 10k ? vcr_r_in_sc 10k ? vcr_l_in_sc 10k ? tv_r_in_sc 10k ? tv_l_in_sc 10k ? enc_l_in_sc 10k ? st_aux_in_sc 10k ? enc_r_in_sc 10 f +5v digital supply dev_addr sda scl interrupt_out max4399 aux_l_out_sc 10 f aux_r_out_sc 10 f vcr_r_out_sc 10 f vcr_l_out_sc 10 f phono_r_out_sc 10 f phono_l_out_sc 10 f rf_mono_out_sc 10 f tv_l_out_sc 10 f tv_r_out_sc 10 f 10 f 10 f 0.47 f +12v aux_ss tv_ss vcr_ss 10k ? 10k ? 10k ? aud_biasv_aud aux_l_in aux_r_in vcr_r_in vcr_l_in tv_r_in tv_l_in all capacitors are 0.1 f and all resistors are 75 ? , unless otherwise noted. 22pf typical application circuit downloaded from: http:///
max4399 audio/video switch for three scart connectors ______________________________________________________________________________________ 31 58 59 60 61 62 54 55 56 57 63 38 39 40 41 42 43 44 45 46 47 v_aud aux_l_out enc_r/c_in top view enc_y/cvbs_inv_vid vcr_b_in vcr_g_in vcr_r/c_in vcr_fs_in vcr_y/cvbs_in aux_y/cvbs_in aux_r/c_in 52 53 tv_y/cvbs_in tv_r/c_in g_aud vcr_r_out aux_r_out vcr_l_out v_aud phono_l_out phono_r_out rf_mono_out g_aud tv_r_out tv_l_out v12 v_aud aux_ss aux_y/cvbs_outv_vid aux_r/c_out tv_b_out tv_g_out g_vidtv_r/c_out tv_y/cvbs_out rf_cvbs_out v_vid 35 36 37 tv_fs_out g_vid trap aud_bias enc_r_in st_aux_in enc_l_in g_dig tv_r_in vcr_l_in vcr_r_in aux_r_in aux_l_in interrupt_out scl sda dev_addr 48 vcr_y/cvbs_out v_dig 64 enc_g_in 65 66 67 enc_c_inenc_y_in enc_b_in 68 enc_fs_in 23 22 21 20 19 27 26 25 24 18 29 28 32 31 30 tv_ss vcr_ss 34 33 49 50 g_vidvcr_r/c_out 51 vid_bias 11 10 9 8 7 6 5 4 3 2 16 15 14 13 12 1 tv_l_in 17 max4399 pin configuration chip information transistor count: 18,134process: bicmos downloaded from: http:///
max4399 audio/video switch for three scart connectors 32 ______________________________________________________________________________________ package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) 68l qfn thin.eps package outline 21-0142 2 1 d 68l thin qfn, 10x10x0.8mm downloaded from: http:///
max4399 audio/video switch for three scart connectors maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 33 2006 maxim integrated products is a registered trademark of maxim integrated products. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) package outline 21-0142 2 2 d 68l thin qfn, 10x10x0.8mm revision history pages changed at rev 1: 1, 30, 32, 33 downloaded from: http:///

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