1997-06-09 , E/IC-826/410

The TEA111x family is a new and growing range of bipolar speech/transmission ICs for wired feature phones, cordless base-stations and answering machines. Designed as a replacement for the world's best-selling speech/transmission (line interface) ICs, the TEA106x family, TEA111x ICs set new standards in EMC performance and integrated features. The current range, which is being exhibited at Asia Telecom '97 (Singapore, June 9 - 14) comprises six types - the TEA1110A, TEA1112/A, TEA1113 and the TEA1118/A - offering a choice of functions for a variety of applications.

"Speech-processing and transmission functions form the heart of a telephone set but are some of the most difficult to implement on a single IC," said Peter Biermans, Marketing Manager at Philips Semiconductors' Telecom Product Group in Caen, France. "As market leader, we've built on our strengths and integration know-how to meet new market requirements. The TEA111x's excellent EMC performance not only allows us to meet the most stringent future EMC regulations around the world, it also opens-up application areas such as digital cordless base stations, where EMC is critical. Also, these ICs protect phones from new interference 'hazards' such as digital mobile phones, RF lighting ballasts and wireless LANs."

A novel chip layout and on-chip filtering at critical points in the circuit are responsible for drastically reducing the TEA111x's susceptibility to interference from RF sources. The TEA1112, 12A and 13 were the first ICs in the range. They offer many new features including operation down to 1.6 V line voltages (allowing several phones to be used in parallel) and LED on-hook/off-hook indication. These ICs also have default settings for parameters such as microphone and receiver gain, AGC range etc., which can be modified by external components. This offers design FLEXibility and, because the default settings are usually acceptable, saves space, components and assembly costs. The ICs come in standard SO and DIP packages. In addition to the features of the TEA1112, the TEA1113 offers a dynamic limiter in the transmit channel to prevent distortion.

The TEA1118 and 18A are ideal for cordless phone base-stations, fax/answering machines and screen phones. They have transmit inputs capable of handling large signals (1 Vrms with 2% THD) and feature a low transmit gain. The TEA1118 provides all the speech-circuit functions required for DECT appliances while the TEA1118A also includes the DTMF dial-tone insertion and muting capabilities required in CT0/CT1 analog cordless phones. They come in SO-14 and in space-saving SSOP-16 packages.

The TEA1110A is the latest addition to the range. This low-voltage IC with dialler interface is a low-cost version of the TEA1112A. Available in a DIP14/SO14 package it provides a highly cost-effective solution for phones not requiring LED on/off-hook indication and microphone mute features.

TEA111x ICs are fabricated using a high-density bipolar process. Being highly integrated, they simplify and speed-up the design of new telephones. Moreover, fewer PCB iterations are required to achieve correct system EMC performance. To aid design-in, Philips Semiconductors offers evaluations boards (demo-kits) for all ICs in the range.