TEA1099H

The TEA1099H is an analog bipolar circuit dedicated for telephone applications. It includes a line interface, handset (HS) microphone and earpiece amplifiers, handsfree (HF) microphone and loudspeaker amplifiers, some specific auxiliary Inputs/Outputs (I/Os) and an analog multiplexer to enable the right transmit and/or receive channels.The multiplexer is controlled by a logic circuit which decodes four logic inputs provided by a microcontroller.Thirteen different application modes have been defined and can be accessed by selecting the right logic inputs.

An application mode is a special combination of transmit and receive channels required by telephone applications.This IC can be supplied by the line and/or by the mains if available (in a cordless telephone or an answering machine for example). It provides a 3.35 V supply for a microcontroller or dialler and a 2.0 V filtered voltage supply for an electret  microphone. The IC is designed to facilitate the use of the loudspeaker amplifier during ringing phase.