SA7267

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.1

2006.05.25

Http: www.silan.com.cn

Page 9 of 11

APPLICATION SUGGEST

The recommended values of the external components shown are the Typical Application Circuit in Split

Supply:

COMPONENTS

RECOMMENDED

VALUE

PURPOSE

LARGER THAN

RECOMMENDED

VALUE

SMALLER THAN

RECOMMENDED

VALUE

R1

10K

Ω

Mute Circuit

Increase of Dz

Biasing Current

R2

15K

Ω

Mute Circuit

VMUTE/STBY

Shifted

Downward

VMUTE/STBY

Shifted

Upward

R3

18K

Ω

Mute Circuit

VMUTE/STBY

Shifted

Upward

VMUTE/STBY

Shifted

Downward

R4

15K

Ω

Mute Circuit

VMUTE/STBY

Shifted

Upward

VMUTE/STBY

Shifted

Downward

R5, R8

18K

Ω

Increase of Gain

R6, R9

560

Ω

Closed Loop Gain

Setting*

Decrease of Gain

R7, R10

4.7

Ω

Frequency

Stability

Danger of Oscillations

Danger of Oscillations

C1, C2

1

µF

Input DC

Decoupling

Higher Low Frequency

Cutoff

C3

1

µF

St-By/Mute Time

Constant

Larger On/Off Time

Smaller On/Off Time

C4, C6

1000

µF

Supply Bypass

Danger of Oscillations

C5, C7

0.1

µF

Supply Bypass

Danger of Oscillations

C8, C9

0.1

µF

Frequency

Stability

Dz

5.1V

Mute Circuit

Q1

BC107

Mute Circuit

* Closed loop gain has to be

25dB.