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.
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 VO.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | U4083 |
TEMIC Semiconductors |
Low-Power Audio Amplifier for Telephone Applications | |
2 | U4080B |
TEMIC Semiconductors |
Voice-Switched Circuit for Handsfree Operation | |
3 | U4082B |
Unisonic Technologies |
VOICE SWITCHED SPEAKER-PHONE CIRCUIT | |
4 | U4087B |
TEMIC Semiconductors |
Low Voltage Voice Switch Interface Circuit | |
5 | U401 |
Calogic LLC |
Dual N-Channel JFET Switch | |
6 | U401 |
Siliconix |
N-Channel JFETs | |
7 | U402 |
Calogic LLC |
Dual N-Channel JFET Switch | |
8 | U402 |
Siliconix |
N-Channel JFETs | |
9 | U403 |
Calogic LLC |
Dual N-Channel JFET Switch | |
10 | U403 |
Siliconix |
N-Channel JFETs | |
11 | U4030B |
TEMIC Semiconductors |
Telephone Speech Circuit | |
12 | U404 |
Calogic LLC |
Dual N-Channel JFET Switch |