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

7

〈VCC〉

VCC

• Power supply for anything other than REC + B.

BA7746S / BA7746FS

Circuit diagram

—

〈REC MUTE CTRL〉

• REC MUTE control.

8

• In REC MUTE mode, the recording amplifier

—

output is stopped.

• REC: L, REC MUTE: H.

• Do not leave open circuit.

〈OVER REC CTRL〉

• OVER REC control.

9

• In OVER REC mode, the recording current is set

—

to + 2dB (Typ.).

• Do not leave open circuit.

30k

MUTE REC

30k

OVER NORMAL

10

〈REC MIX IN〉

• Recording amplifier input.

REC: 2.9V

PB: 2.9V

10k

10k

〈REC NF〉

• Recording amplifier feedback.

11

• Connect the GND of a decoupling capacitor to

main GND (pin 16) to improve common-mode

distortion.

REC: 1.4V

PB: 0.5V

〈REC / PB CTRL〉

• REC / PB control pin.

12

• Use of an RC circuit time constant to slow the rise

of the control signal reduces noise spikes during

—

switching.

• Do not leave open circuit.

4

10.2k

240

1.04k

30k

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