The TEA1110A is a low voltage versatile telephone transmission circuit with dialler interface.
The TEA1110A is a bipolar integrated circuit that provides all speech and line‑interface functions for fully electronic telephone sets, including line‑voltage regulation, microphone and receiving amplifiers, DTMF handling, mute control, and automatic gain control. It operates from a line voltage as low as 1.6 V DC and supplies peripheral circuits via its internal regulator.
The document details the IC's pin configuration, electrical characteristics, typical application circuits, and anti‑sidetone network. It also lists ordering information for DIP14, SO14, and bare‑die packages, and provides reference data for designers of line‑powered telephones, cordless phones, fax machines, and answering machines.
| Minimum line voltage | 1.6 V DC |
|---|---|
| Typical supply voltage (Vcc) | 3.35 V |
| Line current range | 1 – 140 mA |
| Receiving amplifier gain | 33 dB (typ) |
| DTMF amplifier gain | 25.3 dB |
The IC can operate with a line voltage as low as 1.6 V DC (excluding the voltage drop of the external polarity guard).
When MUTE is LOW, the DTMF input is enabled and the microphone and receiving amplifiers are disabled; when MUTE is HIGH, the microphone and receiving amplifiers are enabled and the DTMF input is disabled.