The TEA1064A is a bipolar integrated circuit that performs all the speech and line interface functions required in fully electronic telephone sets. It performs electronic switching between dialling and speech and has a powerful DC supply for peripheral circuits. The IC operates at line voltages down to 1.8 V DC (with reduced performance) to facilitate the use of more telephone sets connected in parallel. The transmit signal on the line is dynamically limited (speech-controlled) to prevent distortion at high transmit levels of both the sending signal and the sidetone.
The TEA1064A is a bipolar integrated circuit designed to perform all speech and line interface functions required in fully electronic telephone sets. It handles electronic switching between dialling and speech and includes a powerful DC supply for peripheral circuits. The IC is capable of operating at line voltages as low as 1.8 V DC, facilitating the connection of multiple telephone sets in parallel. A key feature is the dynamic limiting of the transmit signal, which is speech-controlled to prevent distortion at high transmit levels for both the sending signal and sidetone.
| Operating ambient temperature range | -25 to +75 °C |
|---|---|
| Line current operating range (reduced performance) | 2 - 1 mA |
| Microphone amplifier gain range | 44 - 52 dB |
| Receiving amplifier gain range | 20 - 45 dB |
| Exchange supply voltage range | 36 - 60 V |
The IC operates at line voltages down to 1.8 V DC, though with reduced performance.
The IC supports dynamic, magnetic, or piezo-electric microphones via symmetrical high-impedance inputs, and electret microphones via an asymmetrical input.
It prevents distortion of the line signal and sidetone at high transmit levels by controlling the transmit signal dynamically.