This is a technical specification of TEA1067, which is a low voltage telephone transmission circuit
The Philips TEA1067 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 operations. The device is capable of operating down to a DC line voltage of 1.6 V (with reduced performance), facilitating the parallel use of multiple telephone sets.
| Line voltage (normal operation) | 3.65 - 4.15 V |
|---|---|
| Line current operating range | 11 - 140 mA |
| Internal supply current (power down input LOW) | 0 - 1.35 mA |
| Supply voltage for peripherals (MUTE HIGH) | 2.2 - 2.4 V |
| Microphone amplifier gain range | 44 - 52 dB |
| Receiving amplifier gain range | 20 - 45 dB |
| Line loss compensation gain control range | 5.5 - 6.3 dB |
| Exchange supply voltage range | 36 - 60 V |
The circuit can operate down to a DC line voltage of 1.6 V, though this results in reduced performance.
The device supports dynamic, magnetic, piezoelectric, and electret microphones.
When MUTE is HIGH, the DTMF input is enabled and the microphone and receiving amplifier inputs are inhibited.