SC9153A 查看數據表（PDF） - Silan Microelectronics

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SC9153A

ELECTRONIC VOLUME CONTROLLER

Silan Microelectronics 

Silan

Semiconductors

SC9153A

DESCRIPTION OF OPERATION

1. SETTING OF ATTENUATION

On the SC9153A, attenuation can be increased/decreased according to the stae of U/D terminal ”H” or “L”

level ) by actuating the build-in oscillator. The attenuation is automatically set at the -40dB positions when power is

applied.

Power

Supply

U/D

OSC

-40dB

-34dB

-36dB

-38dB

-32dB

-30dB

When the UP key is pressed after power ON,

the U/D terminal is place in the UP state at “H”

level, and the oscillator is actuated. When the

DOWN key is pressed, the U/D terminal is kept

at “L” level as long as the Down key is pressed,

and the oscillator is actuated in the down state

and therefore, attenuation is decreased.

Oscillation frequency is decided by Cx and Rx.

Fosc=1/(0.7*Rx*Cx) (Hz) (Rs>3Rx)

VDD

16

Cx

Rs

OSC

9

Rx

Rx=33kΩ

U/D

10

Cx=4.7µF

Rs=100kΩ

UP

Down

2.2µF

Vss

2.ATTENUATION DISPLAY OUTPUT

The SC9153A is provided with DC current output terminal for displaying attenuation. With 0dB ~ ∝ divided in to

13steps, current of approx 100µA/step is transmitted.

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0 2000.12.31

4

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