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| Video ICs Switchless REC / PB amplifier for standard audio signal processing BA7757BK The BA7757BK contains a playback equalizer amplifier, an REC / PB switch, a line amplifier, an ALC circuit with built-in detector, a recording amplifier, an analog switch for input switching, and a logic control circuit for independent switching of REC / EE, PR / EE, line mute and input. The IC is easy to interface with control systems, and features low noise during mode switching and at power on / off. The line amplifier and recording amplifire are directly connected internally, allowing construction of a high-performance audio signal processing circuit for VCRs using a minimum number of external components. *Features switches for audio signal processing 1) All necessary are built-in. * MIC / LINE input selector switch. * EP / SP equalizer selector switch. * Built-in head switch on the playback side of the head for head switching for REC / PB, and a headswitch driver terminal provided on the recording side. * EE / PB and EE / REC selector switches (compatibility with after-recording mode (AFR) is possible). * Line muting switch. 2) All control functions are independent, so interfacing with the control system is simple. 3) Amplifiers required for audio recording and playback are provided on the IC. 4) Excellent S / N and distortion specifications through use of high-level ALC VR. 5) The ALC level is set using a external resistor, and variation due to temperature is extremely low. 6) Built-in ripple filter gives excellent ripple rejection. 7) Low noise generation when power is switched on and off, and during control system switching. 8) The line output can directly drive earphone. 9) Few external parts required. 10) Available in a QFP32 package, for high-density mounting. 11) Low power consumption. 1 Video ICs BA7757BK *Block diagram LINE / MIC INPUT CTRL FREQ. COMPENSATION INPUT SW OUT LINE IN MIC IN PB IN GND 24 23 22 21 20 19 18 17 INPUT SW EP SW 25 16 EP SW PB NF 26 PB 120k GND 15 EP / SP CTRL FILTER 27 14 REC NFB SP SW 28 BIAS 13 EE / REC CTRL VCC 29 Vreg REC 12 REC OUT PB OUT 30 39.2dB - 24.4dB 11 EE / PB CTRL LINE REC IN 31 R 10 LINE BF 9 HEAD SW CTRL P LINE PB IN 32 LINE OUT BIAS ALC 1 BIAS 1 (VCC / 2) 2 LINE NFB 3 N.C. 4 BIAS 2 5 ALC FILTER 6 AGC VR CTRL 7 ALC LEVEL 8 MUTE CTRL 2 Video ICs BA7757BK *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 8.01 4002 - 10 ~ + 65 - 55 ~ + 125 Unit V mW C C 1 When IC is stand alone. 2 Reduced by 4mW for each increase in Ta of 1C over 25C. *Recommended operating conditions Parameter Power supply voltage Symbol VCC Min. 4.0 Typ. -- Max. 6.0 Unit V *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, and f = 1kHz) Parameter Quiescent current (SP mode) Quiescent current (EP mode) Symbol IqSP IqEP Min. -- -- Typ. 7.0 8.0 Max. 9.8 11.2 Unit mA mA Conditions No signal, EE and SP mode No signal, EE and EP mode LINE IN ~ LINE OUT, VIN = - 25dBV1 DISTN = 1%1 VIN = - 15dBV VIN = - 15dBV1 Line amplifier (LINE IN ~ LINE OUT) Distortion Maximum output level ALC level ALC distortion DISTNEE VOmL VOA DISTNA -- 0.75 - 6.8 -- 0.06 1.1 -5 0.08 0.2 -- - 3.2 0.2 % Vrms dBV % Recording amplifier (LINE IN ~ REC OUT) Gain Distortion Maximum output level GVR DISTNR VOmR 39.1 -- 0.85 40.8 0.06 1.2 42.5 0.2 -- dB % Vrms VIN = - 25dBV, input attenuation conversion VIN = - 25dBV1 DISTN = 1%1 Input switch (MIC IN ~ SW OUT) Gain Distortion Input resistance Maximum output level GVSW DISTNSW ZINM VOmsw - 0.5 -- -- 0.85 0 0.002 75 1.2 -- 0.1 -- -- dB % k Vrms DISTN = 1%1 VIN = - 14dBV VIN = - 14dBV1 1 Measured at BW = 0.4 to 30kHz. 3 Video ICs BA7757BK *Measurement circuit PB IN INPUT SW CTRL INPUT SW OUT LINE IN MIC IN 6.2k 62k 10k 1k 1k 0.47 24 23 22 21 20 INPUT SW ON Gvope + 220 33 25 26 330k 0.01 + 120k PB 27 14 + 33 12k 28 5.6k BIAS 13 1 100 + Vreg 30 - 24.4dB 11 + VCC 29 + LINE (REC) IN PB OUT & LINE (PB) IN 1 56k 5.6k 56k 1 31 + R 39.2dB 10 LINE BF 9 A 10 + P 32 1 + 5.6k BIAS ALC 1 33 + 2 + 3 NP 22 N.C. 4 5 47 1M + ON ALC OFF FADE OUT / FADE IN CTRL Fig. 1 4 + + + + 470p 4.7 1 0.47 220p 18 17 19 16 15 4.7 2.7k 51k EP / SP CTRL ON GVOREC EE / REC CTRL REC OUT 10k EE / PB CTRL REC 12 VCC LINE OUT 10k 100 ON RL 100 6 22k 7 8 10k MUTE CTRL Units R: C: F Video ICs BA7757BK *Application example AUDIO HEAD INPUT SW CTRL LINE IN 1k TP TP 0.47 + + MIC IN 1k AC BIAS OSC 0.47 220p 18 17 24 23 22 21 20 19 INPUT SW 25 120k PB 27 BIAS 14 EE / REC CTRL 33 28 13 + + 16 EP / SP CTRL 26 15 Vreg 30 + - 24.4dB 39.2dB 11 31 + R P 10 + LINE BF 9 + VCC 29 REC 12 EE / PB CTRL VCC LINE OUT 32 BIAS ALC 4 5 6 22k 47 10k 7 8 1 33 + + 2 3 NP N.C. 22 1M + FADE OUT / FADE IN CTRL MUTE CTRL Fig. 2 Units R: C: F *External dimensions (Units: mm) 9.0 0.3 7.0 0.2 24 9.0 0.3 7.0 0.2 25 32 1 1.45 0.1 0.05 8 17 16 9 0.4 0.15 0.1 0.15 0.8 0.4 0.1 QFP32 5 |
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