CD8227 데이터 시트보기 (PDF) - Unspecified

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CD8227

LOW FREQUENCY POWER AMPLIFIER

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SUM

TEST CIRCUIT & BLOCK DIAGRAM

CD8227GP

*(1) This IC can be used without coupling capacitor (CIN),If volume slide noise occurred by

input offset voltage is undesirable, it needs to use the capacitor(CIN).

*(2) The condenser between the ④ pin and the GND(C11)is for reducing pop noise when the

power ON/OFF switch (SW1)is set to ON/OFF.

APPLICATION INFORMATION AND APPLICATION METHOD

1. ADJUSTMENT OF VOLTAGE GAIN

The voltage gain Gv is obtained as follows

by R1,R2 and Rf in Fig.1.

Gv=20log((Rf+R1+R2)/(Rf+R1))

When Rf=0 Gv=56.5dB(Typ.)

When Rf=120Ω Gv=45dB(Typ.)

By increasing Rf , reduction of Gv is possible ,

However, since the feedback

Fig 1.

increase is liable to produce oscillation , it is recommended to use this at 40dB or

over.

3/8

SUM

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