4

Video ICs

BA7746S / BA7746FS

—

8—

9—

10

REC: 2.9V

PB: 2.9V

11

REC: 1.4V

PB: 0.5V

12

—

Pin No.

Pin name, function and remarks

Voltage

Circuit diagram

•

Power supply for anything other than REC + B.

〈REC MUTE CTRL〉

•

REC MUTE control.

•

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.

•

In OVER REC mode, the recording current is set

to + 2dB (Typ.).

•

Do not leave open circuit.

〈REC MIX IN〉

•

Recording amplifier input.

〈REC NF〉

•

Recording amplifier feedback.

•

Connect the GND of a decoupling capacitor to

main GND (pin 16) to improve common-mode

distortion.

〈REC / PB CTRL〉

•

REC / PB control pin.

•

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.

MUTE

REC

30k

OVER NORMAL

30k

10k

10k

10.2k

240

1.04k

30k