SA1469TN

Pin No.

Symbol

I/O

Description

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

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

○

PIN23 < 0.7V

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..

4)

When the voltage of the mute pin is above 2V, the mute circuit is stopped and the output circuit is operated

normally.

5)

If the chip temperature rises above 175

°C, then the TSD (Thermal Shutdown) circuit is activated and the

output circuit is muted.

6)

When the voltage of PIN23<0.7V ,the output circuit will be muted.

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.2

2008.07.23

Http://www.silan.com.cn

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