ADAU1472

The ADAU1472 is a high quality SigmaDSP^® digital audio processor with a large internal memory, enabling efficient audio source separation, far field voice capture, speech processing, deep learning, and advanced audio signal processing. The processor combines the highly optimized Cadence^® Tensilica^® HiFi^® 4 audio/voice processor with custom Analog Devices, Inc., instruction extensions for math acceleration, and a flexible input and output architecture. The HiFi 4 processor supports four 32-bit × 32-bit multiplier accumulators (MACs) per cycle with 72-bit accumulators, dual 64-bit memory load, and a native Institute of Electrical and Electronics Engineers (IEEE) single precision, floating-point multiplier.

The ADAU1472 processor offers performance up to 270.336 MHz, supports low latency, sample by sample audio processing, and block by block processing paradigms in parallel. The integer phase-locked loop (PLL) and flexible clock generator hardware can generate up to 15 audio sample rates simultaneously (8 kHz to 192 kHz). These clock generators, along with the on-board asynchronous sample rate converters (ASRCs) and flexible hardware audio routing matrix, greatly simplify the design of complex audio systems.

The HiFi 4 digital signal processor (DSP) core has 480 kB of L1 memory running at the DSP core clock rate, which consists of 256 kB data random access memory (RAM), 64 kB instruction RAM, 128 kB data cache, and 32 kB instruction cache, along with 2 MB of L2 system static random access memory (SRAM) running at one half of the DSP core clock rate. The processor also supports up to 2 GB of external flash memory to enable the storage of large data tables and self boot code.

Dual on-chip power domains allow low power operation, including the capability of routing audio through a flexible audio routing matrix with IOVDD as the only active supply. The configurable voice detection hardware can detect human speech onset while operating in a low power state and can generate both internal DSP and external wake-up signals.

The ADAU1472 interfaces with a wide range of analog-to-digital converters (ADCs), digital-to-analog converters (DACs), digital audio devices, amplifiers, and control circuitry due to its highly configurable serial ports, Sony/Philips digital interface format (S/PDIF) interfaces, and multipurpose input/output pins. The device can also directly interface with up to 14 pulse density modulated (PDM) output microphones due to integrated decimation filters specifically designed for that purpose. The PDM outputs with integrated interpolation filters provide direct connectivity to PDM input Class D amplifiers.

The processor has two serial peripheral interface (SPI) bus master control ports that allow the device to communicate with multiple SPI-compatible devices including support for single, dual, and quad input/output operation. In addition, the SPI flash port allows direct memory mapped read access with minimal central processing unit (CPU) overhead and standalone self boot operation.

The combined high performance DSP core, large RAM, and small footprint make the ADAU1472 an ideal replacement for large, general-purpose DSPs that consume more power for the same processing load.

Applications

• Far field voice interface devices
• Audio source separation
• Embedded deep learning for audio
• Commercial and professional audio processing