TEA1112

INTEGRATED CIRCUITS DATA SHEET TEA1112; TEA1112A Low voltage versatile telephone transmission circuits with dialler interface Product specification Supersedes data of 1996 Feb 16 File under Integrated Circuits, IC03 1997 Mar 26 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuits with dialler interface FEATURES Low DC line voltage; operates down to 1.6 V (excluding polarity guard) Voltage regulator with adjustable DC voltage Provides a supply for external circuits Symmetrical high impedance inputs (64 kΩ) for dynamic, magnetic or piezo-electric microphones Asymmetrical high impedance input (32 kΩ) for electret microphones DTMF input with confidence tone Mute input for pulse or DTMF dialling (MUTE for TEA1112 and MUTE for TEA1112A) Receiving amplifier for dynamic, magnetic or piezo-electric earpieces AGC line loss compensation for microphone and earpiece amplifiers LED on-hook/off-hook status indication Microphone mute function (MMUTE for TEA1112 and MMUTE for TEA1112A). APPLICATION TEA1112; TEA1112A Line powered telephone sets, cordless telephones, fax machines and answering machines. GENERAL DESCRIPTION The TEA1112; TEA1112A are bipolar integrated circuits that perform all speech and line interface functions required in fully electronic telephone sets. They perform electronic switching between speech and dialling. The ICs operate at a line voltage down to 1.6 V DC (with reduced performance) to facilit...