Earpiece amp runs off 2V supply

Geneva, September 26, 2003 - STMicroelectronics (NYSE: STM) has introduced a pair of compact mono audio amplifiers for driving 16 to 32 Ohm speakers and ear-pieces in cellular and cordless phones, personal digital assistants and other portable appliances.

The TS419 and TS421 are available in space-saving MiniSO-8 and DFN8 packages. The parts will operate from a supply of just 2V and draw a maximum of 2.5mA. Standby current consumption can be as little as 10nA. Standby mode can be active high for the TS419 or active low for the TS421.

The parts can be ordered with an external gain configuration or with fixed gain of 6, 12, 18 dB (reducing the need for external components). The parts also have On/Off click reduction circuitry.

With a Vcc of 5V the parts offer a typical output power of 295mW into 16 Ohm, at a total harmonic distortion plus noise (THD + N) figure of 1% maximum. With a 32 Ohm load, output power is 207mW.

With a Vcc of 3.3V the parts offer a typical output power of 113mW into 16 Ohm, at a total harmonic distortion plus noise (THD + N) figure of 1% maximum. With a 32 Ohm load, output power is 81mW.

The signal to noise ratio for the parts is typically 98dB(A) with a 5V supply. The power supply rejection ratio (PSRR) figure typically 56dB at 1kHz, with the inputs grounded.

Further information on these devices is available at: www.st.com/stdlinear

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2002, the Company's net revenues were $6.32 billion and net earnings were $429.4 million. Further information on ST can be found at http://www.st.com.