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| UA8229 Datasheet, PDF (7/9 Pages) Unisonic Technologies – LOW FREQUENCY POWER AMPLIFIER | |||
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UA8229
 APPLICATION INFORMATION
LINEAR INTEGRATED CIRCUIT
1. Adjustment of voltage gain
The voltage gain GV is obtained by R1, R2 and RF as below. By increasing RF, reduction of GV is possible. 40dB or
over in use is recommended.
RF + R1 + R2
GV = 20 log
RF+ R1
Sine oscillation is probable as a result of feedback in crease.
2. Input stage
The input circuit of this IC is as shown as below.
PNP TR: TR1 is provided in the input circuit so as to make its usage possible without the input coupling capacitor.
However, at Pin 10 and Pin 11 max 60 mV offset voltage is produced.
Fig.2 illustrate the input circuit of UTC UA8229. A offset voltage of 60mV max is possible. TR1 is featured to eliminate
the usage of coupling capacitor.
TR2
INPUT
10/11
CIN
TR1
30kƸ
13/14
GND
OUTPUT
30kƸ
TR3
2/4
To DRIVER
45Ƹ
To BIAS
NF
9/12
Rf
+ 47ÇF
FOR HSIP-14B PACKAGE
Fig. 2
TR2
INPUT
10/11
CIN
TR1
30kƸ
13/14
GND
OUTPUT
30kƸ
TR3
2/4
To DRIVER
45Ƹ
To BIAS
NF
9/12
Rf
+ 47ÇF
FOR HSIP-15A PACKAGE
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 9
QW-R107-033.C
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