TEA1111A Description
The TEA1111A is a bipolar integrated circuit that performs all speech and line interface functions required in fully electronic telephone sets. It performs electronic switching between speech and dialling. The IC operates at a line voltage down to 1.5 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel.
TEA1111A Key Features
- Low DC line voltage; operates down to 1.5 V (excluding voltage drop across external polarity guard)
- Line voltage regulator with adjustable DC voltage
- Speech mode
- Ringer mode
- Trickle mode
- Microphone amplifier with symmetrical high impedance inputs
- DTMF amplifier with confidence tone on earpiece
- Earpiece amplifier with adjustable gain and volume control
- MUTE input for pulse or DTMF dialling
- AGC line loss pensation for microphone and earpiece
TEA1111A Applications
- Line powered telephone sets with LCD module