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TEA1064A Datasheet(PDF) 2 Page - NXP Semiconductors |
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TEA1064A Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 36 page March 1994 2 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting TEA1064A 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 compensation (line current dependent) for microphone and earpiece amplifiers (not used for DTMF amplifier) • Gain control curve adaptable to exchange supply • Automatic disabling of the DTMF amplifier in extremely-low voltage conditions • Microphone MUTE function available with switch PACKAGE OUTLINES Notes 1. SOT146-1; 1998 Jun 18. 2. SOT163-1; 1998 Jun 18. TEA1064A :20-lead DIL; plastic (SOT146).(1) TEA1064AT:20-lead mini-pack; plastic (SO20; SOT163A).(2) |
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