SC9235S 데이터 시트보기 (PDF) - Silan Microelectronics

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SC9235S

ELECTRONIC VOLUME

Silan Microelectronics 

Silan

Semiconductors

2. VOLUME UP, DOWN CONTROL CIRCUIT

Volume up, down control is executed by UP , DN key input.

* The 1 step / 1 push volume is controlled by "L" level of UP , DN key.

* If UP , DN key is input "L" continuously, volume level is changed continuously.

* Timing of key input

UP / DN INPUT

VOLUME LEVEL

t

T

a

(fOSC=20Hz)

Note: t : Prevent time for chattering  2.2h1/fosc(110ms)

T: Switching time to automatic mode  10h1/fosc(500ms)

a : Up,Down speed  2h1/fosc(100ms)

foscCx•Rx(Hz) : Rx=12~220k¡

SC9235

3. DC OUTPUT CIRCUIT FOR VOLUME LEVEL

DC output for volume level meter is internally connected to D−A converter (R/2R type).

8 stage output voltage which is corresponded to volume level is generated.

Because output impedance ≈ 22kΩ (typ.) is high, If input impedance of next setting level meter IC is low,

set to Buffer.

Equivalence circuit

2R

DC-OUT

R

2R

2R R

R

R≈22kΩ

* Volume step and Output voltage

Step Attenuation(dB) Output Voltage(V)

0~3

0~6

7/ 8 VDD

4~7

8 ~ 14

6/ 8 VDD

8 ~ 11

16 ~ 22

5/ 8 VDD

12 ~ 15

24 ~ 30

4/ 8 VDD

16 ~ 19

32 ~ 38

3/ 8 VDD

20 ~ 23

40 ~ 50

2/ 8 VDD

24 ~ 27

54 ~ 66

1/ 8 VDD

28 ~ 31

70 ~ ∞

0

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0 2000.12.31

5

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