16-Channel 118 dB SNR Differential Output, 192 kHz, 24-Bit DAC

The ADAU1966 is a high performance, single-chip DAC that provides 16 digital-to-analog converters (DACs) with differential output using the Analog Devices, Inc., patented multibit sigma-delta (Σ-Δ) architecture. An SPI/I2 C port is included, allowing a microcontroller to adjust volume and many other parameters. The ADAU1966 operates from 2.5 V digital, 5 V analog and 3.3 V or 5 V input/output supplies. A linear regulator is included to generate the digital supply voltage from the analog supply voltage. The ADAU1966 is available in an 80-lead LQFP package.

The ADAU1966 is designed for low EMI. This consideration is apparent in both the system and circuit design architectures. By using the on-board PLL to derive the internal master clock from an external LRCLK, the ADAU1966 can eliminate the need for a separate high frequency master clock and can be used with or without a bit clock. The DACs are designed using the latest Analog Devices continuous time architectures to further minimize EMI. By using 2.5 V digital supplies, power consumption is minimized, and the digital waveforms are a smaller amplitude, further reducing emissions.

Applications

* Automotive audio systems

* Home theater systems

* Digital audio effects processors

* 118 dB DAC dynamic range and SNR

* −98 dB THD + N

* Differential voltage DAC output

* 2.5 V digital, 5 V analog and 3.3 V or 5 V I/O supplies

* 521 mW total (32.6 mW/channel) quiescent power

* PLL generated or direct MCLK master clock

* Low EMI design

* Linear regulator driver to generate digital supply

* Supports 24-bit and 32 kHz to 192 kHz sample rates

* Low propagation 192 kHz sample rate mode

* Log volume control with autoramp function

* Temperature sensor with digital readout ±3°C accuracy

* SPI and I2C controllable for flexibility

* See data sheet for additional features