16-channel audio DAC boasts high-performance at lower power
The 24-bit ADAU1966 16-channel audio D/A converter provides 118-dB 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.
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