Stereo Audio Codecs Hold Down Power

A pair of 24-bit stereo audio codecs offers designers of portable audio electronics an opportunity to achieve longer battery life without compromising audio quality. The ADAU1361 achieves a signal-to-noise (SNR) ratio of greater than 100 dB while dissipating less than 5 mW in stereo playback mode. The ADAU1761 audio codec adds a SigmaDSP digital audio processor for customizing the end user’s audio experience. The ADAU1361 and ADAU1761 audio codecs include stereo audio ADCs and DACs that support sample rates from 8 kHz to 96 kHz, and a digital volume control. The analog input stage supports a stereo line input, a stereo analog microphone interface, and a circuit to supply the microphone bias voltage. The analog output stage includes two differential and three single-ended outputs, allowing for the direct connection of stereo headphones, an earpiece, and other output transducers. AC-coupled or “capless” configurations are supported for the headphone interface. The differential line outputs can interface to a broad portfolio of ADI’s Class-D power amplifiers. The ADAU1361 and ADAU1761 are sampling now and will be available in production quantities in November. The ADAU1361 and the ADAU1761 are housed in 5-mm × 5-mm, 32-lead QFN (quad flat no-lead) packages and are pin- and footprint-compatible. The ADAU1361 is priced at $2.88 each in 1,000-unit quantities. The ADAU1761 is priced at $3.91 each in similar quantities. ANALOG DEVICES INC., Norwood, MA. (781) 329-4700.