SA1469XH

(Continued)

Pin No.

Symbol

I/O

Description

9

IN2B

I

Drive input

10

IN2A

I

Drive input

11

OUT2B

O

Drive output

12

OUT2A

O

Drive output

13

GND

--

Ground

14

OPOUT

O

Opamp output

15

OPIN (-)

I

Opamp input (-)

16

OPIN (+)

I

Opamp input (+)

17

OUT3A

O

Drive output

18

OUT3B

O

Drive output

19

IN3A

I

Drive input

20

IN3B

I

Drive input

21

--

Supply voltage

22

--

Supply voltage

23

VREF

I

2.5V bias voltage

24

IN4B

I

Drive input

25

IN4A

I

Drive input

26

OUT4B

O

Drive output

27

OUT4A

O

Drive output

28

GND

--

Ground

FUNCTIONAL DESCRIPTION

1. MUTE

Function

Mute

Operation conditions

Thermal shutdown

○

T≥175

°C

External muting

○

V(mute)≤ 1.4V or open

1)

The circuit is muted during thermal shutdown and during the mute-on state.In each case, only the drivers are

muted.

2)

During mute ,the output pins remain at the internal bias voltage, roughly (Vcc-Vf)/2.

3)

When the mute pin # 7 is open or the voltage of the mute pin # 7 is below 0.5V, the mute circuit is activated

so that the output circuit will be muted.

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.4

2008.07.23

Http://www.silan.com.cn

Page 4 of 11