LA8519M

Ordering number : ENN6471 Monolithic Linear IC LA8519M I/O Switch/Voice Signal-Processing IC for Cordless Telephones Overview The LA8519M is a cordless telephone base unit IC that provides I/O switching, voice signal processing, and other functions. It integrates, on a single chip, crosspoint switch, power amplifier, electronic volume and tone control, microphone amplifier, speech network, and other functions. Features Allows switching between two anti-sidetone networks (near terminal/far terminal) depending on the line current, and thus achieves excellent sidetone characteristics over a wide range of line currents. Built-in transmitter/receiver amplifier driver power supply switching circuit allows communication using extension without power from the telephone network. The receiver amplifier supports both ceramic receivers (BTL) and dynamic receiver (single). Built-in power amplifier (load: 8 to 32 Ω): VCC = 5 V, RL = 8 Ω, Pomax = 200 mW The power amplifier signal path includes an electronic volume control (7 steps of about 3.8 dB each) Includes a 10-input/9-output crosspoint switch that provides mixing functions for easy implementation of systems that support a diverse range of signal path switching functions. Functions Speech network block — Impedance matching, 2-wire/4-wire converter, line driver, BN circuit network switching circuit, transmitter amplifier, BTL receiver amplifier, DTMF input, key tone input, receiver volume level switching, and power su...