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 = 20 log
When Rf=0, Gv=56dB(Typ.)
When Rf=82 , Gv=45dB(Typ.)
By increasing Rf, reduction of Gv is Possible.
However, since the feedback increase is liable to
produce oscillation, it is recommended to use this
at 40dB or over.
2. THERMAL SHUT-DOWN CIRCUIT
The thermal shut-down circuit is built in for the purpose of preventing the destruction
of IC due to the abnormal temperature rise when the heat radiation is insufficient.
The operation temperature is set at radiation Fin temperature 175 (Typ.)
At this temperature or over the bias is interrupted to prevent the destruction of IC.
3. INPUT STAGE
The input circuit of this IC is as shown in Fig. 2.
PNP TR:Q1 is provided in the input circuit so as
to make its usage possible without the input coupling
capacitor. However, at pins and , max 60mV
offset voltage is produced. Application after checking
volume slide noise is recommended.
For cutting the volume slide noise, insert the input
capacitor : CIN in series to interrupt the DC component.
1994. 10. 31
Revision No : 0