BA7746S 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA7746S

VCR Hi-Fi audio signal REC / PB amplifier

ROHM Semiconductor 

Video ICs

Pin No.

Pin name, function and remarks

Voltage

〈PRE GND〉

• GND for the HEAD AMP.

19

• Use this terminal for the pin 17 to pin 21 GND

connections to improve the noise characteristics.

• Connect this pin to the main GND (pin 16).

GND

〈PRE IN ch2〉

• Inputl for the playback amplifier (ch2).

The low-frequency cutoff characteristics can be

adjusted with the value of the input coupling

REC: 0V

20

capacitor.

PB: 0.7V

• The frequency characteristics can be adjusted so

that it is flat with the L value of the rotary

transformer, and the external capacitor C (100pF

etc.).

〈PRE AC-FB ch2〉

21

• AC feedback for the playback amplifier (ch2).

• The high-frequency characteristics of the playback

REC: 0V

PB: 0.8V

amplifier can be adjusted with the R value.

BA7746S / BA7746FS

Circuit diagram

—

4k

21

13k

20

〈N.C.〉

22

• Unused.

—

—

• Connect to 〈MAIN GND〉 to improve the

interchannel matching.

〈REC + B ch2〉

• REC + B (ch2).

23

• Open emitter output circuit.

REC: 4.1V

PB: 0V

• Turns on and off in accordance with the REC / PB

control signal.

〈REC + B ch1〉

• REC + B (ch1).

24

• Open emitter output circuit.

REC: 4.1V

PB: 0V

• Turns on and off in accordance with the REC / PB

control signal.

∗ The values given above are design values, they are not ratings and are not guaranteed.

6

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