U4083B Datasheet, PDF (1/16 Pages) TEMIC Semiconductors – Low-Power Audio Amplifier for Telephone Applications

Features
• Wide Operating Voltage Range: 2V to 16V
• Low Current Consumption: 2.7 mA Typically
• Chip Disable Input to Power Down the Integrated Circuit
• Low Power-down Quiescent Current
• Drives a Wide Range of Speaker Loads
• Output Power P_o = 250 mW at R_L = 32Ω (Speaker)
• Low Harmonic Distortion (0.5% Typically)
• Wide Gain Range: 0 dB to 46 dB
Benefits
• Low Number of External Components
• Low Current Consumption
1. Description
The integrated circuit U4083B is a low-power audio amplifier for telephone loudspeak-
ers. 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 where the closed-loop gain is adjusted with two external resistors. A chip dis-
able pin permits powering down and/or muting the input signal.
Figure 1-1. Block Diagram
Low-power
Audio Amplifier
for Telephone
Applications
U4083B
Vi ⁴
FC3 ³
Amp1
4k
4k
6 _VS
5
VO1
50k
FC2 ²
125k
50k
U4083B
Amp2
8
VO2
1
Bias circuit CD
7
GND
Rev. 4655C–CORD–03/06