Low power codecs extend battery life

Dallas — Texas Instruments' family of low-noise, stereo codecs with power consumption as low as 14 milliwatts (mW) promise to extend the battery run-time of portable applications like cellular handsets, MP3 players with record functionality and digital still cameras.

The TLV320AIC3x family of 16-, 20-, 24-, and 32-bit stereo audio codecs consume as little as one-third the power of similar devices, said Greg Davis, portable audio marketing manager in TI's high performance analog business. The devices' extensive register-based power control enables stereo 48-kHz playback as low as 14 mW from a 3.3-V analog supply, he said.

The digital-to-analog (D/A) converter provides a signal-to-noise ratio (SNR) of 100 dB. In addition, the TLV320AIC33 and the TLV320AIC31 offer differential inputs, which cancel noise that normally enters the analog-to-digital (A/D) converter, Davis said.

The stereo audio D/A converter includes programmable digital filtering so that designers can easily add 3D spatial enhancement; bass, treble and midrange effects; and speaker equalization and de-emphasis, according to Davis. The devices also provide muxing capability among as many as 10 input pins and 10 output pins, as well as fully-programmable mixing capability with volume control. A programmable phase-locked loop (PLL) supports the standard audio rates from a wide range of clocks, from 512 kHz to 50 MHz, and it reduces cost and eases design by eliminating the external crystal, Davis said.

The TLV320AIC31, TLV320AIC32 and TLV320AIC33 are available today. The TLV320AIC31/32 comes in a 5 x 5 mm, 32-pin QFN package and the TLV320AIC33 is packaged in a 5 x 5 mm 80 ball MicroStar Junior BGA. Suggested resale pricing in 1,000-unit quantities is $3.45 each for the AIC31 and AIC32 and $3.95 for the AIC33. Click here for the TI data sheets.

Texas Instruments Inc. , 1-800-477-8924,

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