NJM2149
-1 -
LOW VOLTAGE AUDIO POWER AMPLIFIER
■
■■
■ GENERAL DESCRPTION ■ PACKAGE OUTLENE
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.
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■■
■ FEATURES
●Operating Voltage +2 - +6V
●Operating Current 2.2mA typ., at V
+
=3V
●Supply Current in Power Down Mode 0.1µA typ
●Output Power Exceeds250mW V
+
=6V,R
L
=32Ω
●Gain Range GVD=0-43dB,Voise Band
●Load Impedance R
L
=8-200Ω
●Bipolar Technology
●Package Outline DIP8,DMP8,SSOP8,VSP8,TVSP8
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■■
■ PIN CONFIGURATION
BIAS 1
2
3
4
8
5
6
7
-V
IN
+V
IN
+V
REF
V
OUT
1
CD
GND
V
+
V
OUT
2
#A
#B
20kΩ
20kΩ
145kΩ
50kΩ
50kΩ
PIN FUNCTION
1.CD
2.+V
REF
3.+V
IN
4.-V
IN
5.V
OUT
1
6.V
+
7.GND
8.V
OUT
2
NJM2149D NJM2149M
NJM2149V NJM2149R
NJM2149RB1
