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Audio chip adds headphone, loudspeaker to portables

Posted: 09 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? TS4956? driver? power amplifiers? amps?

STMicro's TS4956 headphone and loudspeaker chip

STMicroelectronics has introduced a compact stereo headphone and loudspeaker driver chip, with a flexible I?C bus control interface, which is intended for mobile phones, PDAs and laptop computers. The new TS4956, in a Pb-free 2.5-by-2.4mm flip-chip package, can drive up to 38mW per channel continuous average power into 16-ohm headphone loads, or 450mW into 8-ohm loudspeaker loads, when operating on a 3.3V power supply.

Mobile phone designers are moving away from traditional audio power amplifiers to more complex integrated audio solutions, ST said, and the TS4956 provides such a system by offering three dedicated outputs in a single chip: one stereo headphone drive, one stereo loudspeaker output and one mono line for a handsfree set.

Designed for space-critical applications, the new device minimizes the number of external components required by providing I?C selection of eight different operating modes, including a stereo loudspeaker option, and 32-step -34dB to 12dB digital volume control. It features an ultralow standby current of 0.5?A, with just 10nA shutdown current, and can operate on power supplies from 2.7V to 5.5V. Pop and click noise-reduction circuitry eliminates turn-on and turn-off noise.

The headphone outputs are power limited, by monitoring the output voltage and current in the phantom ground configuration, to minimize the chance of users' hearing damage. In addition, the device itself is protected by an over-temperature shutdown mechanism activated at 150C. Operating temperature range is -40C to 85C.

The TS4956 is available in an 18-bump flip-chip package, priced at $1.10 in quantities of 1,000 pieces.




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