TEA1112A Overview
TEA1112A are bipolar integrated circuits that perform all speech and line interface functions required in fully electronic telephone sets. They perform electronic switching between speech and dialling. The ICs operate at a line voltage down to 1.6 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel.
TEA1112A Key Features
- Low DC line voltage; operates down to 1.6 V (excluding polarity guard)
- Voltage regulator with adjustable DC voltage
- Provides a supply for external circuits
- Symmetrical high impedance inputs (64 kΩ) for dynamic, magnetic or piezo-electric microphones
- Asymmetrical high impedance input (32 kΩ) for electret microphones
- DTMF input with confidence tone
- Mute input for pulse or DTMF dialling (MUTE for TEA1112 and MUTE for TEA1112A)
- Receiving amplifier for dynamic, magnetic or piezo-electric earpieces
- AGC line loss pensation for microphone and earpiece amplifiers
- LED on-hook/off-hook status indication