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NJM2149

LOW VOLTAGE AUDIO POWER AMPLIFIER

Japan Radio Corporation  

NJM2149

LOW VOLTAGE AUDIO POWER AMPLIFIER

s GENERAL DESCRPTION

The NJM2149 is an audio power amplifier designed

for telephone applications.

No external coupling capacitors are required because

of the differential outputs. The closed loop gain is

adjusted by two external resistors, and a CD pin permit

powering down with muting the input signal.

The NJM2149 improves the tern noise reduction in

switching Power Down mode and external high band

noise reduction, compared with NJM2135.

It is suitable for portable telephone , wireless

telephone, button telephone, and other speaker

amplifier applications.

s PACKAGE OUTLENE

NJM2149D

NJM2149V

s FEATURES

qOperating Voltage

qOperating Current

qSupply Current in Power Down Mode

qOutput Power Exceeds250mW

qGain Range

qLoad Impedance

qBipolar Technology

qPackage Outline

+2 - +6V

2.2mA typ., at V+=3V

0.1µA typ

V+=6V,RL=32Ω

GVD=0-43dB,Voise Band

RL=8-200Ω

NJM2149RB1

DIP8,DMP8,SSOP8,VSP8,TVSP8

NJM2149M

NJM2149R

s PIN CONFIGURATION

-VIN 4

+VIN 3

V+

6

BIAS

#A

20kΩ

1 CD

5 VOUT1

PIN FUNCTION

1.CD

2.+VREF

3.+VIN

4.-VIN

5.VOUT1

6.V +

7.GND

8.VOUT2

+VREF 2

50kΩ

145kΩ

50kΩ

20kΩ

#B

7

GND

8 VOUT2

-1 -

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