U4083B
Low-Power Audio Amplifier for Telephone Applications
Description
The integrated circuit, U4083B, is a low power audio
amplifier for a telephone loudspeaker. It has differential
speaker outputs to maximize the output swing at low
supply voltages. There is no need for coupler capacitors.
The U4083B has an open loop gain of 80 dB whereas the
closed loop gain is adjusted with two external resistors. A
chip disable pin permits powering down and/or muting
the input signal.
Features
D
Wide operating voltage range: 2 to 16 V
D
Battery powered application due to low quiescent
supply current: 2.7 mA typical
D
Output Power, P
o
= 250 mW @ R
L
= 32
W
(speaker)
D
Low harmonic distortion (0.5% typical)
D
Wide range gain adjustable: 0 dB to 46 dB
D
Chip disable input to power down the integrated
circuit
Benefits
D
Low number of external components
D
Low current consumption
D
Low power down quiescent current
D
Drives a wide range of speaker loads
Block Diagram / Application Circuit
0.1
m
F
Input
Ci
1
m
F
75 k
W
Ri
3 k
W
Rf
4
Vi
FC1 3
C1
5
m
F
50 k
W
2
125 k
W
50 k
W
–
+
Amp.1
5
4 k
W
VO1
4 k
W
–
+
Amp.2
Bias
circuit
7 GND
Figure 1.
V
S
6
8
VO2
1
CD
C2 FC2
93 7781 e
Order Information
Extended Type Number
U4083B-AFP
U4083B-AFPG3
Package
SO8
SO8
Remarks
Taped and reeled
TELEFUNKEN Semiconductors
Rev. A2, 07-Apr-97
1 (11)
Preliminary Information
TEMIC [ TEMIC SEMICONDUCTORS ]
