Low-Power Audio Amplifier for Telephone Applications
U4083B
Low-Power Audio Amplifier for Telephone Applications
Description
The integrated circuit, U4083B, is a low power a...
Description
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, Po = 250 mW @ RL = 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
0.1mF Input Ci 1mF 75 k W Ri 3 kW Rf 4 Vi FC1 3 C1 5mF 50 k W 2 125 kW 50 k W – + Amp.1 5 4 kW VO1 4 kW – + 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
U4083B
Pin Description
CD 1 8 VO2 GND VS VO1
94 8022
FC2 FC1 Vi
2
7
3
6
4
Figure 2. Pinning
5
Pin 1 2 3 4 5 6 7 8
Symbol CD FC2 FC1 V...
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