9

Video ICs

BA7180AS / BA7180AFS

Control system logic table

(1) DFF IN (pin 1)

• Playback input selection (head switching)

Control pin

Control voltage

H

L

0.0 ~ 1.2

DFF IN

Function

Selected playback input

Channel 1 (PRE IN1)

Channel 2 (PRE IN2)

(2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15)

• Controls recording AGC detector block operation.

Control pin

HON

L

OFF

0.0 ~ 1.2

Function

AGC detector

H SYNC

Control voltage

(3) PB / EE / REC CTRL (BA7180AS: pin 11, BA7180AFS: pin 10)

• Playback / recording mute / recording mode switching

Control pin

Mode

H

PB

ON

ON

OFF

OFF

M

OFF

OFF

ON

ON

L

REC

OFF

OFF

OFF

ON

PB / EE / REC

2.2 ~ 2.8

0.0 ~ 1.2

Function

PRE AMP

AT ENVE

REC MUTE

REC AMP

REC MUTE

Ω resistor.

Control voltage

N.C. pins can be connected to GND.