TEA1064A Datasheet | NXP Semiconductors

INTEGRATED CIRCUITS DATA SHEET TEA1064A Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting Product specification File under Integrated Circuits, IC03A March 1994 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting GENERAL DESCRIPTION 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. Features - Low DC line voltage; operates down to 1.8 V (excluding polarity guard) - Voltage regulator with low voltage drop and adjustable static resistance - DC line voltage adjustment facility - Provides a supply for external circuits in two options: unregulated supply, regulated line voltage; stabilized supply, line voltage varies with supply current - Dynamic limiting (speech-controlled) in transmit direction prevents distortion of line signal and sidetone - Symmetrical high-impedance inputs (64 kΩ) for dynamic, magnetic or piezo-electric microphones - Asymmetrical high-impedance input (32 kΩ) for electret microphones - DTMF signal input - Confidence tone in the earpiece during DTMF dialling - Mute input for disabling speech during pulse or DTMF dialling - Power-down input for improved performance during pulse dial or register recall (flash) - Receiving amplifier for magnetic, dynamic or piezo-electric earpieces - Large amplification setting ranges on microphone and earpiece amplifiers - Line loss...