TA8251AHQ

2004-09-28

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

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

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

threshold voltage of pin(2) is set at about 3V (typ.), and

the power supply current is about 100µA (typ.) at the

stand−by state.

Stand

−By

Power

On

Off

0~2

Off

On

Adjustage of stand−by SW

microcomputer, the switching relay can be omitted.

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

switching