9

Video ICs

BA7746S / BA7746FS

(1) REC / PB control

Switch between REC and PB using pin 12.

REC / PB

H

REC

ON

OFF

ON

OFF

L

PB

OFF

ON

OFF

ON

REC + B SW

REC AMP

PRE AMP

HEAD SW (P)

Mode

Control pin

Function

(2) OVER REC control

Control for OVER REC (current emphasis) is done using pin 9.

When in OVER REC mode, the gain setting is recording

amplifier AGC level + 1.9dB.

H

L—

OVER REC

OVER REC

Mode

Function

REC AGC Level

Control pin

(3) REC MUTE control

Control for REC MUTE when recording is done using pin 8.

REC MUTE

REC AMP

H

REC MUTE

OFF

L—

ON

Mode

Control pin

Function

(4) EP / SP control

EP / SP control during playback is done using pin 4. When

EP is selected, the gain of the playback amplifier is increased

by 5dB over its normal setting.

EP / SP

H

EP

Typ. + 5dB

L

SP

Typ.

Mode

Function

PRE AMP gain

Control pin