UA1029 View Datasheet(PDF) - Unisonic Technologies

Part Name

Description

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UA1029

LOW FREQUENCY POWER AMPLIFIER

Unisonic Technologies 

UA1029

„ 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.

INPUT

10/11

Rf

R1

9/12

+ CNF

45Ω

47μF

+

AMP

-

R2

30kΩ

OUTPUT

2/4

Fig.1

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 UA1029. A offset voltage of 60mV max is possible. TR1 is featured to

eliminate the usage of coupling capacitor.

OUTPUT

INPUT

TR2

TR3

30kΩ

2/4

10/11

CIN

TR1

30kΩ

13/14

GND

To DRIVER

45Ω

To BIAS

NF

9/12

Rf

+ 47μF

Fig. 2

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5

QW-R107-033.B

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