SM7153 データシートの表示（PDF） - Samhop Mircroelectronics

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SM7153

ELECTRONIC VOLUME CONTROLLER

Samhop Mircroelectronics 

三合微科股份有限公司

SM7153

SAMHOP Microelectronics Corp. ELECTRONIC VOLUME

CONTROLLER

FUNCTION DESCRIPTION

(1) Setting Of Attenuation

After power on, attenuation is automatically set at -40dB.

POWER SUPPLY

U/D

OSC

-30dB

-32dB

-34dB

-36dB

-38dB

-40dB

Figure 1

When the UP key is pressed after power ON, the U/D terminal is placed in the up state at

' H ' level, and the oscillator is actuated.

When the DOWN key is pressed, t

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 Cx * Rx

(Hz) (Rs≧3Rx)

VDD

RS

UP

CX

OSC

osc

RX

U/D

DWOM

+

RX=33 KΩ

- 2.2uF CX=4.7µF

RS=100 KΩ

VSS

Figure 2

Page 3

V.1.0

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