8

Video ICs

BA7796FS

LINE

ALC

0dB

BIAS

OSC

EQ

REC AMP

REC / EE

CTRL

REC + B

EQ CTRL

LINE OUT

+ 28dB

TUNER IN

LINE IN1

PB / EE CTRL

LINE IN2

MUTE CTRL

12

11

10

9

8

7

6

5

4

3

2

1

24

23

22

21

20

19

18

17

16

15

14

13

INPUT SW CTRL

ATT

– 8dB

ATT

– 8dB

ATT

– 8dB

C [F]

Units: R [

Ω]

Fig. 3

(1) Mute signal

Apply the mute signal shown below at power on and

off.

If the muting time is short, a “pop” sound will be audi-

ble, particularly when the power is switched on.

The mute signal must also be applied when switching

PB, LINE1,LINE2 and TUNER.

(2) Recording control

Do not switch the PB and REC modes on together.

This will cause erroneous operation.

(3) Line output

The line output can drive a load resistance of up to

2k

Ω.

Some types of load can result in local oscillation (eg.

large capacitive loads that draw large current), so cau-

tion is required. In particular, when there is a possibility

that the line output will be connected to a shielded

cable, or line cable, connect a resistor of about 1k

Ω in

series with the output so that the capacitive load is not

directly coupled to the IC output terminal.

(H)

(H)

Vcc

MUTE CTRL

LINE OUT

2 sec. Min.