Stereo Headphone Amplifier suits portable applications.
Press Release Summary:
Manufactured in 1.8 x 2.3 mm flip-chip package, TS4975 has I2C bus control interface that enables 14-step volume control from +18 to -34 dB. Product delivers up to 40 mW per channel continuous average power into 16 Ω loads on 3.3 V power supply and allows phantom ground output configuration to eliminate capacitors required for single-ended designs. Along with 9 operating modes, amp features pop and click noise-reduction circuitry to eliminate turn-on/off noise.
Original Press Release:
Bus-Controlled Stereo Headphone Amplifier from STMicroelectronics Ideal for Portable Applications
High-quality, low power amplifier is controlled through serial I2C bus to minimize external components
Geneva, September 28, 2005 - STMicroelectronics (NYSE: STM), a world leader in mobile phone audio solutions, has introduced a compact stereo headphone driver chip with an I2C bus control interface intended for portable applications such as mobile phones equipped with FM radio that need quality audio output and minimum additional components. The TS4975 amplifier can deliver up to 40mW per channel continuous average power into 16-ohm loads on a 3.3V power supply; its I2C interface enables a 14-step volume control range from 18dB to -34dB.
The tiny 1.8 x 2.3mm flip-chip package is ideal for space-critical applications, and the TS4975 also allows a phantom ground output configuration to eliminate the bulky capacitors required for single-ended designs. It features ultra-low standby current of 0.6-microamps and can operate on power supplies between 2.5 to 5.5V. Pop and click noise-reduction circuitry eliminates turn-on and turn-off noise.
Nine operating modes, which include various combinations of input and output switching, plus independent channel shutdown, are also controlled through the I2C interface. The device is intended for cellular phones, PDAs, laptop computers and portable audio products, where space for both electronics and for manual controls is limited and control is achieved more easily through the MCU.
Output power capability into a 16-ohm load ranges from 21mW on a 2.5V supply to 102mW on 5V supply, at THD+N (Total Harmonic Distortion plus Noise) of 1%. The TS4975 is characterized for the -40 to +85 degree C temperature range, and is available now in a 12-bump flip-chip package. The TS4975 is priced at $1.20 in quantities of 5000 pieces.
Further information is also 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 2004, the Company's net revenues were $8.76 billion and net earnings were $601 million. Further information on ST can be found at www.st.com.
