STK404-200-E

No. A1491-10/11

DC Offset Detector Circuit

DC offset protection is activated if VDC(+) or VDC(-)

≈0.5V (typ) is applied to DC (#8). The HIC shuts down and the

state of the error pin switches from high to low. The (open collector output) latch mode is cleared by setting the pin to

the ground level.

Set the protection level with the voltage dividing resistors R1 and R2 and determine the time constant value of C so that

the IC will not malfunction when generating the audio signals.

Sample Application Circuit

* Please refer to “13.Application circuit” about recommended Value.

Error Indicator (Open Collector)

The state of the ERROR pin (#2) switches from high to low (open collector output) when a protection circuit is

activated.

ERROR

+V (to +VCC)

H: Normal condition

L: Error

STK404-200-E

13

12

11

10

9

8

7

6

5

4

3

2

1

ERROR

OC

-Pre

-VCC +VCC

OUT+

OUT-

+Pre

SUB

/GND

IN

NF

ST

BY

DC

error (max) 20mA

Output to speaker

STK404-200-E

13

12

11

10

9

8

7

6

5

4

3

2

1

ERROR

OC

-Pre

-VCC +VCC

OUT+

OUT-

+Pre

SUB

/GND

IN

NF

ST

BY

DC

R1

R2

C