16-channel audio D/A converter provides high-performance audio at lower power

November 29, 2011 // By Paul Buckley
Analog Devices, Inc. has introduced a 16-channel audio D/A converter that is capable of improving audio system performance and reducing power consumption for professional, ‘prosumer’ and automotive audio equipment applications.

The 24-bit ADAU1966 16-channel audio D/A converter provides 118dB-SNR (signal-to-noise ratio) performance at 32-kHz to 192-kHz sampling rates.  The device’s 118-dB SNR performance is achieved with what the company claims is a lowest in class power consumption of less than 300 mW for 16-channel operation by running the digital portion of the ADAU1966 at a lower voltage. The digital supply can be generated on chip via a linear regulator allowing the ADAU1966 to operate off a single analog supply. Alternatively, the regulator can be bypassed and a separate 2.5-V to 3.3-V supply provided to the chip.

Operating the ADAU1966 with full-scale differential output voltage of 3 Vrms reduces the need f o r downstream gain and preserves a high SNR against electrically-coupled system noise. By using the ADAU1966 A/D converter’s on-board PLL (phase-locked loop) to derive the internal master clock from an external left/right clock, the ADAU1966 eliminates the need for a separate high frequency master clock and can be used with or without a bit clock .

The ADAU1966 is qualified for AEC-100 automotive applications and operates at a -40 to +105° C temperature range. It also features an SPI/I 2 C port which allows an external microcontroller to adjust volume and read the chip temperature to within +/-3°C.  

The ADAU1966 operates well in a system with a variety of ADI’s SigmaDSP digital audio processors including the ADAU1442, ADAU1445, ADAU1446 and AD1940 .  The device can also be used along with ADI’s SHARC floating-point DSP products and the Blackfin 16/32-bit line of embedded processors.

Availability and Pricing

Samples of the ADAU1966 are available now and the device is in full production.  The ADAU1966 is packaged in a 80-lead LQFP.  The device is priced at $6.51 each per 1,000.

Visit Analog Devices at www.analog.com