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Stereo codecs tout ultralow power consumption

Dallas&#8212With the focus on extended battery run-times and optimizing the noise/power consumption tradeoff, Texas Instruments says its PCM3793 and PCM3794 stereo audio codecs for portable consumer applications (digital still cameras and media players) are the industry's lowest-power devices of their kind. The PCM3793 further increases power efficiency with its integrated Class-D power amplifier stage, which can deliver 700 mW per channel into an 8-ohm load (the PCM3794, without speaker outputs, provides manufacturers with the flexibility to use an external amplifier). The codecs consume just 7 mW in playback; signal-to-noise ratio (SNR) is 93 dB.

“With exceptionally low playback power and integrated features in the PCM379x codecs, TI has struck the optimal balance of power and performance that our customers require,” said Greg Davis, high performance portable audio marketing manager, Texas Instruments. “For instance, it's exciting that we can help enable features, such as zooming while recording video on a digital still camera. Additionally, these devices integrate equalization and audio effects that can be helpful for portable media players.”

The PCM379x features a notch filter (without which users need to disable the zooming function during video recording to cut system noise on the audio track) with programmable center frequencies. Its tone control provides bass, treble, and mid-range equalization effects to allow the listener to maximize audio performance (for the type of music for example, classical versus jazz). A 3-D enhancement feature essentially extends the actual speaker-to-speaker distance for a “wide-stereo” effect.

An on-chip, digital audio processor keeps signal processing in the digital domain. The codecs can be operated with just one power supply, unlike others that require an additional supply for analog and digital circuitry. An integrated capacitor-less headphone driver reduces external component count while also improving bass frequency response.

PCM379x audio codecs support standard interfaces for audio (I2 S, L-R justified, DSP) and control (I2 C, SPI), as well as multiple single-ended and differential inputs and outputs (six inputs for both, with five outputs for the PCM3793 and three for the PCM3794). Inputs are selectable, and outputs can be mixed for varied applications.



The PCM379x family complements the company's portfolio of analog and DSP products for the portable audio signal chain, including the Digital Audio platform of DSPs, audio data converters, clocks, Class-D audio power amplifiers and cap-free headphone amplifiers.
Click here for the Audio Solutions Guide.

Click here for additional information on the PCM379x. The PCM3793 and PCM3794, both in a 32-pin,5-by-5 mm QFN, are sampling now and are expected to be in production this month. Pricing for the PCM3793 is $4.50 and the PCM3794 is $4.25 each, both in quantities of 1,000 units. A turnkey evaluation module, scheduled for availability next month, will include a PC-based interface for easily programming PCM379x devices.

Texas Instruments , 1-800-477-8924, www.ti.com

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