1998-06-17 , E/IC-1015/41
Product News From Philips Semiconductors

Both the contrast and viewing angle of liquid crystal displays depend on the provision of a highly stable supply voltage, yet in phone-line powered telephones this is difficult to achieve because of the wide variations that occur in telephone line conditions. With the introduction of the  TEA1114A Speech/Transmission IC, Philips Semiconductors provides a fully integrated solution to this problem - by incorporating a high-performance voltage stabilizer into this innovative new telephone IC. The TEA1114A's stabilized supply generator not only ensures consistent LCD performance, it is also capable of delivering more than enough current to drive Philips Semiconductors' latest generation of 3.3-volt telecom oriented TELX microcontrollers. Another new feature of the TEA1114A is a gain boost facility on the earpiece amplifier.

"The introduction of the TEA1114A indicates Philips Semiconductors' on-going commitment to producing ICs that continually improve telephone performance," said product marketing manager Muriel Gombaud. "Based around our world-beating speech/transmission circuit design, these ICs will further strengthen our number-one position in the telephone IC market," she added.

The output of this new IC's on-chip voltage stabilizer follows the line voltage up to 3.3 V, at which point it regulates the output voltage at this level for output currents as high as 3 mA. Continuous stabilization of the output under all normal ringing, dialling and speech transmission conditions eliminates LCD display disturbances and ensures continuous operation of connected microcontrollers and peripherals.

The speech/transmission circuit in the TEA1114A includes all the features for which Philips Semiconductors' telephone ICs have become famous. These include low line voltage modes that allow several telephones to be operated in parallel on the same line, automatic line-loss compensation, adjustable DC and AC set impedance and superior EMC performance. In addition, the TEA1114A features a variable gain earpiece amplifier with gain boost facilities, on-chip microphone and DTMF amplifiers, a muting input and automatic confidence tone insertion. On-chip default settings for all amplifier gains and voltage levels mean that very few external components are required in the majority of telephones.

The TEA1114A is manufactured in an advanced bipolar process at Philips Semiconductors' facility in Caen, France, and can be supplied in a 16-pin DIP or space-saving 16-lead small-outline package. In volumes of 100k or more pieces the TEA1114A sells for around US$ 0.55.

Philips Semiconductors, a division of Philips Electronics NV, headquartered in Eindhoven, The Netherlands, is the ninth largest semiconductor supplier in the world and the third largest supplier of discretes in the world. Philips Semiconductors' innovations in digital audio, video, and mobile technology position the company as a leader in the consumer, multimedia and wireless communications markets. Sales offices are located in all major markets around the world and are supported by systems labs.