DESCRIPTION
The UTC TEA1062/1062A is a bipolar integrated circuit performing all speech and line interface function, required in the fully electronic telephone sets. It performs electronic switching between dialing speech. The circuit is able to operate down to D.C. line voltage of 1.6V (with reduced performance) to facilitate the use of more telephone sets in parallel. 

FEATURES
* Low d.c. line voltage; operates down to 1.6V
   (excluding polarity guard).
* Voltage regulator with adjustment static resistance.
* Provides supply with limited current for external
   circuitry.
* Symmetrical high-impedance inputs (64kΩ)for
   dynamic, magnetic or piezoelectric microphones.
* Asymmetrical high-impedance inputs (32kΩ)for
   electret microphones.
* DTMF signal input with confidence tone.
* Mute input for pulse or DTMF dialing.
* Receivering amplifier for several types of earphones.
* Large amplification setting range on microphone
   and earpiece amplifiers.
* Line loss compensation facility , line current
   depedant (microphone and earpiece amplifiers).
* Gain control adaptable to exchange supply.
* Possibility to adjust the d.c. line voltage.