TA8252H

2002-10-30

3

Caution And Application Method

(description is made only on the single channel.)

1. Voltage gain adjustment

This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can't adjusted, but it makes the

device a space and total costs saver.

Therefore, the total voltage gain is decided by expression below.

2. Stand-by SW function (pin(2))

By means of controlling pin(2) (stand-by terminal) to high

and low, the power supply can be set to on and off.

and the power supply current is about 2µA (typ.) at the

stand-by state.

Stand

-by

Power

On

Off

0~1.5

Off

On

3~6

Adjustage of stand-by SW

(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for

switching

+

−

+

−

+

−

(Fig.1) Block diagram

Amp. 2B

Amp. 2A

Amp. 1

Input

2

10kΩ

Power

ON

OFF

(Fig.2) With pin(2) set to High,

Power is turned ON

to Bias

cutting circuit