BA7746FS datasheet(3/12 Pages) ROHM

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Video ICs

BA7746S / BA7746FS

•Pin descriptions

REC: 0.9V

PB: 0V

3—

4—

REC: 3.6V

PB: 1.9V

REC: 2.0V

PB: 2.0V

VCC

—

(RL: 1.8k

Ω)

Pin No.

Circuit diagram

Pin name, function and remarks

Voltage

〈VCC REC + B〉

•

Power supply for REC + B.

•

Connect to VCC (pin 7).

〈REC TC〉

•

REC + B time constant.

•

Use to adjust the REC + B rise time using the C

value. The value of the built-in resistor is 20k

Ω.

•

The effect of current spikes when recording is

started is reduced

〈HSWP IN〉

•

Pulse input for head switching.

•

ch1: H, ch2: L

〈EP / SP CTRL〉

•

EP / SP mode control.

•

In EP mode, the playback amplifier gain is set to

+ 5dB (Typ.).

•

EP: H, SP: L

•

Do not leave open circuit

〈PRE OUT〉

•

Playback amplifier output.

•

Open emitter output.

•

When there is a chance of oscillation due to

capacitive load, reduce the output current, or

connect a resistor in series (approx. 390

Ω).

•

Avoid capacitive coupling with the playback input

〈VCA CTRL (PRE MUTE)〉

•

VCA control.

•

When the terminal is open (a C is required), the

playback amplifier gain is set to the Typ. value.

•

The PRE MUTE function is made possible by

connection of a mute H signal to this

through a diode

20k

REC

24k

40k

MUTE H

580

30k

20k

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