Low power stereo audio codecs

4 March 2009 Analogue, Mixed Signal, LSI

Analog Devices recently extended its line of audio processing solutions with a pair of codecs (coder/decoders) for high-performance portable audio electronics that deliver longer battery life without compromising audio quality. The ADAU1361 and ADAU1761 24-bit audio codecs are ideally suited for wireless handsets, portable media players, portable navigation devices, digital still cameras and other mobile audio and telephony applications.

The ADAU1361 achieves greater than 100 dB signal-to-noise ratio (SNR), while dissipating less than 5 mW in stereo playback mode. The ADAU1761 adds a SigmaDSP digital audio processor for customising the end user’s audio experience. ADI’s SigmaStudio graphical design tool allows the combination and integration of ADI’s algorithm suite, customer developed algorithms, and/or branded third-party audio algorithms.

Both codecs include stereo audio ADCs (analog-to-digital converters) and DACs (digital-to-analog converters) 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. It also supports the new standard in high-performance, low-noise digital microphones.

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 serial control bus supports the I²C or SPI protocols, while the serial audio bus is programmable for I²S, left/right justified or TDM modes. A programmable PLL supports flexible clock generation for all standard rates and available master clocks from 8 MHz to 27 MHz.

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