TEMIC Semiconductors U4090B
U4090B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line.| Part No. | U4090B |
|---|---|
| Datasheet | U4090B Download |
| Manufacturer |  TEMIC Semiconductors |
| Description | Monolithic Integrated Feature Phone Circuit |
| Buy | Stock & Price |
DESCRIPTION
The µc controlled telephone circuit An integrated voice switch with loudspeaker amplifier allows loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits.FEATURES
D D D D D D D D D D D D D D D DC characteristic adjustable Transmit and receive gain adjustable Symmetrical input of microphone amplifier Anti-clipping in transmit direction Automatic line loss compensation Symmetrical output of earpiece amplifier Built-in ear protection DTMF and MUTE input Adjustable sidetone suppression independent of sending and receiving amplification Speech circuit with two sidetone networks Built-in line detection circuit Integrated amplifier for loudhearing operation Anti-clipping for loudspeaker amplifier Improved acoustical feedback suppression Power down D Voice switch D Tone ringer interface with dc/dc converter D Zero crossing...
