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Headphone driver IC designed for space-constraint portable apps

Posted: 03 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? ts4975? amplifier?

Compact stereo headphone driver chip

STMicroelectronics introduced a compact stereo headphone driver chip with an I?C 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 new TS4975 amplifier can deliver up to 40mW per channel continuous average power into 16? loads on a 3.3V power supply, while its I?C interface enables a 14-step volume control range from 18dB to -34dB.

The TS4975 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?A 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 I?C 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 microcontroller.

Output power capability into a 16? load ranges from 21mW on a 2.5V supply to 102mW on 5V supply, at THD+N (Total Harmonic Distortion plus Noise) of 1 percent. The TS4975 is characterized for the -40C to 85C temperature range, and is available in a 12-bump flip-chip package.

The TS4975 is priced at $1.20 in quantities of 5,000 pieces.

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