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CXA1897Q Dolby B Type Noise Reduction System with Recording/Playback Equalizer Description The CXA1897Q is an analog signal processing IC for tape recorders. It achieves whole processing operations for the recording and playback systems which include the Dolby B noise reduction function on a single chip. This IC supports 2 channels at each function. Features * Dolby B noise reduction supports 1.7 times normal speed. * Recording/playback equalizer amplifier supports 1.7 times normal speed. * Built-in comparator for AMS (automatic music sensor) * Built-in AGC (automatic gain control) with amplifier for MPX filter. * Playback equalizer outputs independently for DECK-A and DECK-B. * Externally adjustable recording equalizer Gp and fp. * Built-in Recording mute function. * Double cassette dubbing system can be easily configured just with this IC. Applications All analog signal processing in cassette deck parts of tape recorders and compact music centers (Sankyo Seiki mfg. Co., Ltd. YK47R-KF202 or equivalent which has the same head type.) Structure Bipolar silicon monolithic IC 48 pin QFP (Plastic) Absolute Maximum Ratings (Ta=25C) * Supply voltage VCC 12 * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 * Allowable power dissipation PD 735 Operating Conditions * Supply voltage V C C mW VCC 6.5 to 10.0 V These ICs are available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications information may be obtained. "Dolby" and the double D symbols are trade marks of Dolby Laboratories Licensing Corporation. Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. --1-- E93930D78 CXA1897Q Block Diagram GND PB OUTA1 PB FB21 GND GND DECK A PB HEAD GND PB FB22 PB OUTA2 GND + + PB OUTB1 PB FB12 PB INB1 PB INA1 PB INA2 PB FB11 PB INB2 + + GND GND GND GND GND 48 47 46 45 44 43 42 41 40 39 38 37 Vcc GND GND PB OUTB2 1 RFC 2 AMS + 36 35 GND IREF + + GND AMS OUT Vcc GND 3 4 5 6 7 8 + 10k GND AMS GAIN + IREF Vcc 34 VG 33 10k GNDGND GND GND 40k 10dB AMP 10dB AMP AGC IN GND MPX + 40k AGC IREF MUTE AGC OUT GND D REC IN1 D IREF MPX AGC 30 OUT D REC IN2 31 29 REC EQ REC EQ + REC MUTE D PB IN1 DOLBY NR ON/OFF/HI D L OUT1 GND 9 10 28 27 D PB IN2 DOLBY NR REC/PB + + 11 NR 12 TC 25 TC D R OUT1 REC OUT1 DECK A/B DECK (120/70us) A EQ DECK B EQ REC OUT2 (N/Cr/Me) FP CAL SPEED GP CAL REC IN GND GND PB REC DECK B R/P HEAD GND GND GND REC --2-- GND PB REC IN GND GND D R OUT2 13 14 15 16 17 18 19 + + + + 20 21 22 23 24 + + GND NR PBEQ CTL RECEQ CTL 26 D L OUT2 GND + AGC TC AGC IN + + + 32 CXA1897Q Pin Configuration 36 GND 35 IREF 34 VG 33 AGC TC 32 AGC IN2 31 AGC OUT2 30 D RECIN2 29 REC MUTE 28 D PBIN2 27 MODE 26 D L OUT2 25 D TC2 D R OUT2 24 REC IN2 23 GP CAL 22 FP CAL 21 SPEED 20 REC OUT2 19 REC OUT1 18 B EQ 17 A EQ 16 DECK AB 15 REC IN1 14 D R OUT1 13 D TC1 37 PB OUTB2 38 PB OUTA2 39 PB FB22 40 PB FB12 41 PB INB2 42 PB INA2 CXA1897Q 43 PB INA1 44 PB INB1 45 PB FB11 46 PB FB 21 47 PB OUTA1 AGC OUT1 AMS GAIN D RECIN1 AMS OUT D L OUT1 48 PB OUTB1 RFC Vcc AGC IN1 D PBIN1 D IREF 1 2 3 4 5 6 7 8 9 10 NRSW 11 12 --3-- CXA1897Q Pin Description Pin No. 1 Symbol Vcc DC I/O voltage I/O resistance 8.0V -- -- 1 Vcc (Ta=25C, Vcc=8 V, no signals) Equivalent circuit Vcc Description Power supply pin. Vcc x3 x3 2 RFC 8.0V -- -- 2 147 x250 to RFS Connects the resistor and capacitor for providing a ripple eliminated stable voltage in the power supply. GND Vcc 3 AMS OUT 8.0V O -- 3 147 x2 AMS output pin. Connects the resistor and capacitor which determine the attack and recovery time constants of the output to Vcc. No signal supplied High level Signal supplied Low level GND Vcc Vcc 147 5p x2 10k 4 AMS GAIN 2.8V -- -- 4 Connects the resistor which determines the AMS signal detection level. GND Vcc Vcc 5 AGC IN1 32 AGC IN2 4.0V I 50k 147 10k 5 32 40k x4 VGS GND AGC signal input pin. The input resistance varies from 50k to 10k. AGC is applied when a signal of -30dB or more level is input to AGC. (Pin 33 external 47F // 300k) --4-- CXA1897Q Pin No. Symbol DC I/O voltage I/O resistance Vcc Equivalent circuit Vcc x2 Description 6 AGC OUT1 31 AGC OUT2 4.0V O 147 147 6 31 x4 500 500 21k 5k 10k AGC output pin. VGS GND Vcc Vcc 7 D RECIN1 30 D RECIN2 4.0V I 40k 7 9 28 30 147 Dolby NR recording (encoding) input pin. 40k VGS 15k GND Vcc Vcc 9 D PBIN1 28 D PBIN2 4.0V I 40k 15k VGS Dolby NR playback (decoding) input pin. x2 8 D IREF 1.2V -- -- 8 147 4k x4 Connects the 18k resistor for providing the reference current of the Dolby NR section internal filter. GND Vcc Vcc 10 NRSW 2.5V (For OPEN) I 53k 147 50k 5k 10 5k Dolby NR ON/OFF switch. Low : ON Medium :OFF High : 1.7 times normal speed GND GND --5-- CXA1897Q Pin No. Symbol DC I/O voltage I/O resistance Equivalent circuit Vcc Vcc Description x2 147 200 200 x10 6k 11 D L OUT1 26 D L OUT2 4.0V O 147 11 26 Dolby NR line (decoding) output pin. GND GND Vcc x2 Vcc 12 D TC1 25 D TC2 0.3V -- -- 20k 12 25 147 700k Connects the capacitors (0.1F) which determine the time constants of the input signal level detector. GND Vcc GND Vcc 10k 300 300 x10 13k x2 147 13 D R OUT1 24 D R OUT2 4.0V O 147 13 24 Dolby NR recording (encoding) output pin. GND GND Vcc Vcc 147 23k 14 REC IN1 23 REC IN2 4.0V I 50k 14 23 Recording equalizer input pin. 50k 1.8k VGS VGS GND GND --6-- CXA1897Q Pin No. Symbol DC I/O voltage I/O resistance Equivalent circuit Description 15 Playback input deck A/B Vcc Vcc 15 16 20 27 DECK AB A EQ SPEED MODE -- I -- 15 16 20 27 147 GND GND selector switch Low : PB INA High : PB INB 16 Deck A equalizer selector switch. Low : 120s EQ High : 70s EQ 20 R e c o r d i n g / p l a y b a c k equalizer speed selector switch. Low : Normal speed High : High speed (1.7 times normal speed) 27 Dolby NR mode selector switch. Low : Recording (encoding) High : Playback (decoding) Vcc Vcc 17 B EQ 2.5V (For OPEN) I 53k 147 50k 5k 17 5k Deck B equalizer selector switch. Low : Normal tape, 120s EQ Medium : CrO2 tape, 70s EQ High : Metal tape, 70s EQ GND GND Vcc Vcc x3 500 40k x2 500 5p 18 REC OUT1 19 REC OUT2 4.0V O 147 18 19 147 x10 Recording equalizer output. GND GND --7-- CXA1897Q Pin No. Symbol DC I/O voltage I/O resistance Vcc Equivalent circuit Vcc Description Connects the resistor to determine the high-band peak frequency of the recording equalizer. Reference setting resistance is 27k. Connects the 12k resistor to determine each gain of the equalizers. Connects the resistor to determine the high-band peak gain of the recording equalizer. Reference setting resistance is 27k. 21 FP CAL 1.2V -- -- 21 35 x2 147 5p GND GND 35 IREF Vcc Vcc 22 GP CAL 1.2V -- -- 22 x2 147 GND Vcc 50A 20k x2 20k x2 30k GND Vcc 29 REC MUTE -- I -- 29 147 2.7V Recording mute ON/OFF selector switch. Low : Muting ON High :Muting OFF Fader function can be achieved with an external time constant circuit. GND GND Vcc x2 Vcc x2 200 500 x2 5k 100k GND Vcc 30k x2 x2 500 V S G 500 x4 30k GND 33 AGC TC 0.0V -- -- 33 147 500 Connects the resistor and capacitor to determine the attack and recovery time constants of the AGC. 200 GND Vcc 34 VG 4.0V -- 60k 34 147 45k Signal reference voltage. Connects the capacitor for eliminating ripple. GND --8-- CXA1897Q Pin No. Symbol DC I/O voltage I/O resistance 0.0V -- -- Vcc Equivalent circuit 36 Description 36 GND GND Vcc 10k Vcc RFS GND pin. Vcc 43 42 44 41 PB INA1 PB INA2 PB INB1 PB INB2 0.0V I 70k 10k 1k Playback equalizer input pin. 210k 5p 147 210k 45 PB FB11 40 PB FB12 1.4V -- 105k 43 42 44 41 x6 147 70k x6 1k x2 45 40 Playback equalizer negative feedback pin. GND GND GND RFS 2k x4 2k x4 Vcc 46 PB FB21 39 PB FB22 2.8V -- -- 147 46 39 7k x3 x3 Connects the capacitors which determine the 120s, 70s or other time constant of the playback equalizer. GND Vcc Vcc GND GND RFS ON/OFF x3 ON/OFF x2 5k 50k 47 38 48 37 PB OUTA1 PB OUTA2 2.8V PB OUTB1 PB OUTB2 O 147 50k 47 38 48 37 500 147 500 x6 5k x2 Playback equalizer output pin. The pin selected by the deck AB switching has a low output resistance; the other pin has a 50k output resistance. GND GND --9-- CXA1897Q Electrical Characteristics Item Operating voltage Current consumption No signal Conditions Min. 6.5 15.0 (Ta=25C, VCC=8.0V) Typ. 8.0 19.5 Max. 10.0 24.0 Unit V mA Item AGC AGC on output level AGC on channel balance AGC on distortion Conditions 1kHz, -25dBm, AGC TC external 47F // 300k 1kHz, -15dBm, AGC TC external 47F // 300k 1kHz, 0dBm, AGC TC external 47F // 300k Min. -24.0 -2.0 -- Typ. 0.0 0.1 Max. 2.0 1.5 Unit dBm dB % -22.5 -20.0 Item AMS No signal detection level Conditions AMS GAIN=4.7k, 1kHz Reference output level for PB equalizer system (-25.0dBm) Min. -- Typ. -- Max. -23.0 Unit dB Item Playback equalizer amplifier block 120s NORM mode frequency characteristics 70s NORM mode frequency characteristics 120s HIGH mode frequency characteristics 70s HIGH mode frequency characteristics Signal handling Total harmonic distortion S/N ratio Output offset voltage Conditions f=315Hz, Vin=-70dBm reference level f=2.7kHz, Vin=-58.5dBm, against 315Hz f=4.5kHz, Vin=-53.8dBm, against 315Hz f=5.3kHz, Vin=-52.5dBm, against 315Hz f=9.1kHz, Vin=-47.8dBm, against 315Hz 120s-NORM mode, f=1kHz, RL=2.7k, THD+N=1% 120s-NORM mode, f=1kHz, RL=2.7k, Vin=-52dBm 120s-NORM mode, Rg=2.2k, "A" WTG filter 120s-NORM, Rg=70k Min. -27.0 -1.5 -1.5 0.1 0.1 -10.0 -- 55 2.40 Typ. -0.1 0.3 1.3 1.6 -6.0 0.3 62 2.70 Max. 1.5 1.5 3.1 3.1 -- 0.7 -- 3.20 Unit dBm dB dB dB dB dBm % dB V -25.0 -23.0 --10-- CXA1897Q Item Reference input level Reference output level S/N ratio Signal handling Total harmonic distortion Output offset voltage NORM-NORM mode frequency characteristics Recording equalizer amplifier block CrO2-NORM mode frequency characteristics METAL-NORM mode frequency characteristics NORM-HIGH mode frequency characteristics CrO2-HIGH mode frequency characteristics METAL-HIGH mode frequency characteristics Maximum muting amount Muting characteristics Conditions NORM-NORM, 315Hz NORM-NORM, 315Hz Rg=5.1k, "A"-WTG filter NORM-NORM, RL=2.7k, 1kHz, THD=1% NORM-NORM, RL=2.7k, 1kHz, 0dB NORM-NORM 3kHz, -20dB Against NORM-NORM mode at 315Hz, -20dB 8kHz, -20dB 12kHz, -20dB 3kHz, -20dB Against NORM-NORM mode at 315Hz, -20dB 8kHz, -20dB 12kHz, -20dB 3kHz, -20dB Against NORM-NORM mode at 315Hz, -20dB 8kHz, -20dB 12kHz, -20dB Against NORM-NORM 5kHz, -20dB mode at 315Hz, -20dB 15kHz, -20dB 20kHz, -20dB Against NORM-NORM 5kHz, -20dB mode at 315Hz, -20dB 15kHz, -20dB 20kHz, -20dB Against NORM-NORM 5kHz, -20dB mode at 315Hz, -20dB 15kHz, -20dB 20kHz, -20dB NORM-NORM mode, 1kHz, +8dB NORM-NORM mode, 1kHz, 2.0V (MUTE pin voltage) Min. Typ. Max. Unit dBm dBm dB dB % V dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB -29.4 -27.9 -26.4 -- -10.0 -- 57.0 60.6 -- 8.0 8.8 -- -- 0.2 0.5 3.6 4.0 4.4 -1.3 -0.2 1.1 3.7 5.7 7.3 10.4 13.4 16.4 1.8 3.0 4.2 6.7 8.4 9.7 13.2 15.8 18.2 3.3 4.5 5.7 5.9 7.4 8.9 11.3 13.7 15.8 -0.7 0.2 1.7 8.3 10.5 12.3 13.5 16.7 19.5 3.6 4.9 6.0 12.0 14.2 16.0 17.0 20.0 22.5 4.9 6.1 7.3 10.5 12.4 14.0 14.7 17.4 19.7 -- -100 -80 -8.0 -5.6 -4.0 --11-- CXA1897Q Item PB IN input sensitivity REC IN input sensitivity LINEOUT level Dolby level Encode boost 1-(1) Encode boost 1-(2) Encode boost 1-(3) Encode boost 1-(4) Encode boost 1-(5) Encode boost 2-(1) Encode boost 2-(2) Encode boost 2-(3) Signal handling Total harmonic distortion (1) Total harmonic distortion (2) Encode S/N ratio (REC-PB) (PB-REC) (REC 1ch-2ch) (PB 1ch-2ch) Cross talk Conditions PB, NR-OFF, 1kHz, D-R-OUT -10dBm REC, NR-OFF, 1kHz, D-R-OUT -10dBm REC, NR-OFF, 1kHz, D-R-OUT -10dBm DOLBY NR REC OUT pin (0dB) REC, NR-ON, 500Hz -25dB REC, NR-ON, 2kHz -25dB REC, NR-ON, 5kHz -25dB REC, NR-ON, 10kHz, -40dB REC, NR-ON, 10kHz 0dB REC, NR-1.7 times, 850Hz -25dB REC, NR-1.7 times, 8.5kHz -25dB REC, NR-1.7 times, 17kHz -40dB REC, NR-OFF, 1kHz, THD+N=1% REC, NR-OFF, 1kHz, 10dB REC, NR-ON, 1kHz, 10dB REC, NR-ON, CCIR-filter PB, NR-OFF, 1kHz, 0dB REC, NR-OFF, 1kHz, 0dB REC, NR-OFF, 1kHz, 0dB REC, NR-OFF, 1kHz, 0dB Min. -32 -32 -7 -- 1.4 5.5 3.9 9.7 -1.1 1.4 3.9 9.7 14.0 -- -- 65.0 -- -- -- -- Typ. -30 -30 -6 -10 3.0 6.3 5.0 10.6 0.7 3.1 5.1 10.4 15.5 0.01 0.03 66.5 -- -- -- -- Max. -28 -28 5 -- 4.4 8.5 6.9 11.9 1.9 4.4 6.9 11.9 -- 0.2 0.2 -- -65 -60 -55 -55 Unit dBm dBm dBm dBm dB dB dB dB dB dB dB dB dB % % dB dB dB dB dB Dolby block --12-- CXA1897Q Item Control voltage "L" level 1 Control voltage "M" level 1 Control voltage "H" level 1 Control voltage "L" level 2 Control voltage "H" level 2 Control voltage "L" level 3 Control voltage "H" level 3 Note) NORM-NORM : CrO2-NORM : METAL-NORM : 120s-NORM : 70s-NORM : Conditions NRSW (10PIN), B EQ (17PIN) NRSW (10PIN), B EQ (17PIN) NRSW (10PIN), B EQ (17PIN) REC MUTE (29PIN) REC MUTE (29PIN) Other control pins Other control pins Min. 0.0 2.2 4.2 0.0 3.5 0.0 2.5 Typ. -- -- -- -- -- -- -- Max. Unit 0.5 V 2.8 V Vcc V 0.5 V Vcc V 0.5 V Vcc V NORMAL TAPE-NORMAL SPEED CrO2 TAPE-NORMAL SPEED METAL TAPE-NORMAL SPEED EQ=120s-NORMAL SPEED EQ=70s-NORMAL SPEED NORM-HIGH : CrO2-HIGH : METAL-HIGH : 120s-HIGH : 70s-HIGH : NORMAL TAPE-HIGH SPEED CrO2 TAPE-HIGH SPEED METAL TAPE-HIGH SPEED EQ=120s-HIGH SPEED EQ=70s-HIGH SPEED --13-- S41 S42 Electrical Characteristics Test Circuit R71 10k R70 S32 10k S31 R82 100 R81 100 DC Voltmeter S13 R29* 4.5V 2.5V 0.1 R25* 0.018 2V 0V 3.5V S7A 330k R31* V1 V2 V3 V4 V5 ON S11 S12 OFF REC S16 PB 0dB or 30dB Amp R69 R53* S24E 10k R80 R68 10k R67 10k *R59 100k S51 S34 R79 100 S43 S21 100 S58 C54 + C40 300k + + + R20* 12k C21 C22 47/25V R23* 47/25V + C42 S33 R83 50k S50 GND GND C25 5.1k 4.7/25V R27* C27 10k 4.7/25V S8 C29 C31 0.1 R33* + + + + S20A 10k 36 GND + 35 IREF VG R52* C53 + 34 MODE D TC2 AGC TC D PBIN2 AGC IN2 D R OUT2 + 33 24 23 22 27k R44* C50 + 32 10k S24C 31 30 4.7/25V 5.1k S10A 240k C32 R35 4.7/25V 1k R37* C36 S14 C34 0.1 330k 4.7/25V R41* S10C R40* 240k 5.1k C37 R42 4.7/25V 1k 29 28 27 26 25 4.7/25V S5A 4.7/25V R12* C13 AGC OUT2 D RECIN2 R1* 1.2k R2* 1.2k Audio SG REC MUTE D L OUT2 REC IN2 GP CAL FP CAL 27k 4.7/25V 1k 4.7/25V + 2.7k 37 PB OUTB2 38 PB OUTA2 39 PB FB22 40 PB FB12 21 R57 GND C15* 4.7/25V C56 S22 C44 R49* 0.1 4.7/25V 5.1k S10E R45* + 0.015 to Each SW C7 S52 "A"WTG 5V + Power Supply R10* R9* + 68k Vcc 27k 41 PB INB2 SPEED REC OUT2 2.7k C47 R48* C46 R47* + 20 19 18 C45 + NORM S25 HIGH R8* 10k R66 S35 100 R78 S53 S44 S45 R77 R65 10k S36 100 C1 68k 22/25V + + + C14* 0.015 + Vcc AMS OUT AMS GAIN AGC IN1 AGC OUT1 D IREF NRSW DL OUT1 RFC D RECIN1 D PBIN1 D TC1 S56 4.7/25V C26 1k 0.1 + C17 *S20B 0.1 C18 5.1k R26* 10k C38 C39 0.1 C41 C19 47/25V C20 2.2/25V C16 100/25V R21 100k R22* C23 0.47 4.7k C24 R24* S7B R36* R38* 330k C28 R28* S9 4.7/25V C30 330k 0.1 R30* S10B R32* 240k 5.1k 4.7/25V R34* C33 18k S15 C35 0.1 S10D R39* 5.1k 4.7/25V GND X1.7 S17 OFF S18 ON AC S19 V6 240k R43 4.7/25V 1k 0.018 + + + + + + + + --14-- 42 PB INA2 43 PB INA1 REC OUT1 B EQ C49 + DC Ammeter A 47 PB OUTA1 C12 + R7* 27k 2.7k 4.7/25V GND R6* S24A S24B DIN Audio R5* 27k R4* 68k R3* 180 27k 44 PB INB1 17 16 C48 + 4.7/25V R56 68k R18* 180 47 /25V R16* S6A 2.2k C11 0.1 C5 S1 R15* 4.7/25V S6B 2.2k C10 0.1 S2 4.7/25V C4 C3 S3 4.7/25V 0.1 2.2k C9 S6C S4 R14* 4.7/25V C2 0.1 2.2k C8 S6D R13* R17* C6 47/25V 45 PB FB11 A EQ DECK AB REC IN1 D R OUT1 METAL S26 Cr02 S27 S28 1k NORM R55 120S S29 4.7/25V 70S 1k 4.7/25V R46* 1k C43 + S54 1kHz BPF R54 DECK A S30 DECK B 46 PB FB21 15 14 13 4.7/25V 5.1k C52 S23 S10F 0.1 C55 + 100k *R58 R76 4.7/25V R51* 10k S24D R64 100 S46 S55 2.7k 4.7/25V S5B 48 PB OUTB1 CCIR R11* 1 R19* 2 3 4 5 6 7 8 9 10 11 12 4.7/25V C51 + 10k 10k R63 10k S24F R50* R62 10k S37 S57 S38 100 R75 S59 AC Voltmeter Distortion Analyzer R61 10k R60 10k S39 S40 R74 100 R73 100 R72 100 S47 S48 S49 CXA1897Q Oscillo -scope CXA1897Q 1. Description of Control Mode (1) Playback and recording equalizers 1) Playback equalizer (120s/70s) A EQ (16 pin) L H L B EQ (17 pin) M/H DECK AB L 120s 70s A EQ control complied with (15 pin) (A DECK) (A DECK) H B EQ control complied with 120s 70s (B DECK) (B DECK) 2) Recording equalizer (Normal, CrO2, Metal) B EQ (17 pin) REC MODE 3) Speed control SPEED (20 pin) Playback equalizer Recording equalizer 4) Recording mute (29 pin) Recording mute Mute ON Control voltage GNDVCL0.5V -7dB attenuation Mute OFF 2.0V 3.5VVCHVcc L Normal speed Normal speed H 1.7 times normal speed 1.7 times normal speed L Normal (Type I) M CrO2 (Type II) H Metal (Type IV) The muting function is achieved by varying the gain of the recording equalizer amplifier as with an electric volume, depending on the DC voltage level supplied to the REC MUTE pin. Mute ON/OFF and the AGC ON/OFF are interlocked. Rec Mute AGC Mute ON OFF Mute OFF ON Notes for executing the fader function The recording mute and the AGC are interlocked and if the AGC is turned OFF, the AGC output level is increased. Therefore, when the level of 3dB or more is input to the AGC to execute the fader function, the natural characteristics cannot be obtained. Take care of setting the input level to the AGC. 5) FP CAL (21 pin) The standard setting resistance is 27k. However, fo (Hz) is reduced by increasing and increased by reducing this resistance. 6) GP CAL (22 pin) The standard setting resistance is 27k. However, the gain is increased by increasing or reduced by reducing this resistance. --15-- CXA1897Q (2) Dolby B noise reduction 1) Dolby NR input mode MODE (27 pin) Input Dolby NR 2) Dolby NR ON/OFF/x1.7 NRSW (10 pin) Dolby NR L ON M OFF H x1.7 L Rec In (7, 30 pin) Encoding H Pb In (9, 28 pin) Decoding --16-- CXA1897Q 2. AMS (1) AMS output logic Detection status AMS OUT Signal detected L No signal detected H Inside of IC When the pins have been connected as shown on the left figure, 1 Vcc Low : Approximately 0.3V (VCE (sat) voltage) High : Vcc (V) 3 AMS OUT 36 GND (2) AMS level setting With the reference output level (-25dBm) of the playback equalizer as 0dB, consider at how many decibels the AMS level is to be set. { Vpeak (PBOUT1)+Vpeak (PBOUT2) } 2 R (external resistance) x55A Compare R= Vpeak (PBOUT1)+Vpeak (PBOUT2) x106 -- 1 2 Use formula 1 to determine external resistance R. Ex. 1) To set the detection level at 20dB lower than the reference (calculated on the assumption that 1ch=2ch) -25dBm-20dB=-45dBm=6.16mVpeak R=6.16x10-3x106 6.2k In which case, external resistance R is 6.2k. Ex. 2) To set the detection level at 30dB lower than the reference, -25dBm-30dB=-55dBm=1.95mVpeak R=1.95x10-3x106 2k In which case, external resistance R is 2k. (3) AMS band setting By inserting a capacitor in series with the external resistor determined in (2), the direct current of the AMS is cut off. The lower end of the AMS band can be limited by adjusting the capacitor value because the cut-off frequency of the high-pass filter is determined by this external resistor and capacitor. --17-- CXA1897Q Application Circuit 180p to LINE OUT2 4.7/25V AGC IN2 ON/OFF GND GND GNDGND GND 33/25V GND GND 47/25V GND GND 100p PB/REC 12mH GND 4.7/25V + GND 1M 4.7/25V 47/25V MPX -6dB 4.7/25V 4.7/25V 12k + + 4.7/25V + + + + 36 GND 35 IREF 34 VG 33 AGC TC 32 AGC IN2 31 AGC OUT2 30 D RECIN2 29 REC MUTE 28 D PBIN2 27 MODE 26 D L OUT2 25 D TC2 22k GND GND GND GND 5.6k 22k 27k 27k 4.7/25V 150p 180p NORM/HIGH + 0.47 + GND + 10k 37 PB OUTB2 38 PB OUTA2 D R OUT2 24 REC IN2 23 GP CAL 22 FP CAL 21 SPEED 20 0.1 + + 10k 10k 10k 2.2/25V + 2.2/25V 2.7k 4.7/25V 10k 0.015 39 PB FB22 40 PB FB12 41 PB INB2 GND + GND 47/25V 180 10k 2.2/25V + 820p 10k 10k 820p DECK A PB HEAD 42 PB INA2 CXA1897Q REC OUT2 19 REC OUT1 18 B EQ 17 A EQ 16 DECK AB 15 REC IN1 14 AGC OUT1 AMS GAIN D RECIN1 AMS OUT D L OUT1 AGC IN1 D PBIN1 D IREF NRSW D TC1 D R OUT1 13 2.2/25V + 43 PB INA1 GND Bias 12mH 12mH OSC 180p 150p 4.7/25V PB 44 PB INB1 0.015 10k 10k 10k + GND 45 PB FB11 46 PB FB21 47 PB OUTA1 48 PB OUTB1 RFC Vcc 47/25V 180 NORM/CrO2 /METAL GND 120S/70S GND DECK A /DECK B GND REC + GND 4.7/25V + 4.7/25V 22k 5.6k 22k GND 4.7/25V + 2.7k 10k 2.2/25V + 2.2/25V 10k 1 1k 2 3 100k 4 4.7k 5 4.7/25V 6 4.7/25V + 7 4.7/25V + 8 9 4.7/25V + 10 11 4.7/25V 12 0.47 GND GND 10k 100/25V 47/25V 0.47 10k MPX 4.7/25V -6dB 100p 18k 2.2/25V + VCC 12mH 180p Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. --18-- ON/OFF/X1.67 GND GND AMS OUT GND GND GND GND GND GND to LINE OUT1 AGC IN1 VCC GND 0.1 DECK B R/P HEAD PB REC + + + + + + + CXA1897Q Examples of representative characteristics Quiescent current vs. Supply voltage AGC output voltage characteristics AGC OFF 25 Icc-Quiescent current (mA) 0 Output level (dBm) -10 20 -20 AGC ON 15 8 9 7 10 VCC-Supply voltage (V) 11 -30 -40 -30 -20 -10 Input level (dBm) 0 AGC total harmonic distortion 0.5 Vcc=8V AGC TC 47F/300k f=1kHz Total harmonic distortion (%) Play back equalizer total harmonic distortion VCC=8V RL=2.7k MODE 120s-NS f=1kHz 1.0 Total harmonic distortion (%) 0.1 0.05 0.01 0.1 -40 -30 -20 -10 AGC Input level (dBm) 0 -30 -25 -20 -15 -10 Output level (dBm) -5 AMS no signal detection level frequency response AMS Input level (Playback equalizer output level) (dB) VCC=8V 120s-NS AMS OUT 7V 0dB=-25dBm, 315Hz (Playback equalizer reference output level) AMS GAIN 4 0.47 4.7k 2.2 + AMS OUT 3 100k to 8V -20 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz) 10 0 -10 -30 --19-- CXA1897Q PB FB1 60 + PB IN Playback equalizer frequency response PB FB2 47 180 PB OUT M 4.7 + 4.7 50 2.2k 120s-NS 120s-HS 70s-NS 70s-HS 50 100 200 500 1k 2k Frequency (Hz) 5k 10k 20k 50k + GAIN (dB) 40 30 20 10 20 0.015 Recording equalizer frequency response 26 24 22 20 Output response (dB) 18 16 14 12 10 8 6 4 2 0 -2 -4 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k Frequency (Hz) VCC=8V 0dB=NORM-NORM, 315Hz, -30dBm (Tape) (Speed) NORM-NORM CrO2-NORM METAL-NORM NORM-HIGH CrO2-HIGH METAL-HIGH B type encode characteristics 10 8 Encode boost (dB) -30dB 6 VCC=8V 0dB=Dolby Level =-10dBm -40dB 4 -20dB 2 -10dB 0dB 20 50 100 200 1k 500 Frequency (Hz) 2k 5k 10k 20k 0 --20-- CXA1897Q Recording equalizer total harmonic distortion VCC=8V 0dB=-10dBm RL=2.7k MODE : NORM-NORM (Tape) (Speed) 100Hz 1kHz 10kHz Output level vs. MUTE voltage 0 -10 -20 Output level (dB) -30 -40 -50 -60 -70 -80 VCC=8V MODE : NORM-NORM (Tape) (Speed) 0dB=1kHz, +8dB f=1kHz 0.0 1.0 2.0 3.0 4.0 5.0 6.0 REC MUTE pin voltage (V) Total harmonic distortion (%) 1.0 0.1 -90 -10 -5 0 5 10 Output level (dB) 15 NR off total harmonic distortion VCC=8V Encode Mode, RL=10k 0dB=Dolby Level 100Hz 1kHz 10kHz B type total harmonic distortion VCC=8V Encode Mode, RL=10k 0dB=Dolby Level 100Hz 1kHz 10kHz Total harmonic distortion (%) 0.1 Total harmonic distortion (%) 1.0 1.0 0.1 0.01 -10 -5 0 10 15 5 Output level (dB) 0.01 -10 -5 0 10 15 5 Output level (dB) --21-- CXA1897Q Package Outline Unit : mm 48PIN QFP (PLASTIC) 15.3 0.4 + 0.4 12.0 - 0.1 + 0.1 0.15 - 0.05 0.15 36 25 37 24 48 13 + 0.2 0.1 - 0.1 1 + 0.15 0.3 - 0.1 12 0.8 0.24 M + 0.35 2.2 - 0.15 PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE QFP-48P-L04 QFP048-P-1212 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.7g NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). --22-- 0.9 0.2 13.5 |
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