BA7755A 参数 Datasheet PDF下载

Video ICs

High-voltage audio head selection

switch

BA7755A / BA7755AF

The standard audio circuits of video cassette recorders and the recording circuits of tape decks use AC bias record-

ing to record the audio signal onto the tape. This bias voltage is some tens of volts, and a high-capacity bias-side

switch is required to electronically switch the head when in playback or record mode.

The BA7755A and BA7755AF are high-voltage switching ICs designed to switch voltages as high as ± 65V

DC

or

AC120V

P-P

(f = 70Hz).

Two control systems, one for current control, and one for voltage control are provided, so the ICs can be used in cir-

cuits that employ either method.

By combining the BA7755A or BA7755AF with the BA7751ALS recording / playback amplifier, it is possible to con-

struct a compact recording / playback audio circuit. In addition, the BA7755A and BA7755AF are an excellent choice

for a wide variety of other high-voltage switching applications.

•

Applications recorders and tape decks

Video cassette

•

Features

1) High withstanding voltage ( ± 65V

DC

(Min.),

AC120V

P-P

(Min.), f = 70Hz).

2) Circuits for either current control or voltage control

are provided on the chip.

3) Compact SIP 5pin or SOP 8pin package.

•

Block diagram

BA7755A

1

V

CC

2

SW

3

4

5

GND CTRL2 CTRL1

BA7755AF

CTRL1

8

7

6

5

N.C.

N.C.

N.C.

1

2

3

4

V

CC

HEAD GND CTRL2

SWITCH

1