ADAU1451 Datasheet

• Qualified for automotive applications
• Fully programmable audio DSP for enhanced sound processing
• Features SigmaStudio, a proprietary graphical programming tool for the development of custom signal flows
• Up to 294.912 MHz, 32-bit SigmaDSP core at 1.2 V
  Up to 6144 SIMD instructions per sample at 48 kHz
  Up to 40 kWords of parameter/data RAM
  Up to 800 ms digital audio delay pool at 48 kHz
• Integer PLL and flexible clock generators
• Integrated die temperature sensor
• Audio input/output and routing
  4 serial input ports, 4 serial output ports
  48-channel, 32-bit digital input/output up to a sample rate of 192 kHz
  Flexible configuration for TDM, I²S, left and right justified formats, and PCM
  Up to 8 stereo ASRCs from 1:8 up to 7.75:1 ratio and 139 dB DNR
  Stereo S/PDIF input and output
  Four PDM microphone input channels
  Multichannel, byte addressable, TDM serial ports
• Clock oscillator for generating master clock from crystal

• Automotive audio processing
  Head units
  Navigation systems
  Rear seat entertainment systems
  DSP amplifiers (sound system amplifiers)
• Commercial and professional audio processing
• Consumer audio processing

The ADAU1451 are automotive qualified audio processors that far exceed the digital signal processing capabilities of earlier SigmaDSP^® devices. The restructured hardware architecture is optimized for efficient audio processing. The audio processing algorithms are realized in sample-by-sample and block-by-block paradigms that can both be executed simultaneously in a signal processing flow created using the graphical programming tool, SigmaStudio^™. The restructured digital signal processor (DSP) core architecture enables some types of audio processing algorithms to be executed using significantly fewer instructions than were required on previous SigmaDSP generations, leading to vastly improved code efficiency.

The 1.2 V, 32-bit DSP core can run at frequencies of up to 294.912 MHz and execute up to 6144 instructions per sample at the standard sample rate of 48 kHz. However, in addition to industry-standard rates, a wide range of sample rates are available. The integer PLL and flexible clock generator hardware can generate up to 15 audio sample rates simultaneously. These clock generators, along with the on-board asynchronous sample rate converters (ASRCs) and a flexible hardware audio routing matrix, make the ADAU1451 ideal audio hubs that greatly simplify the design of complex multirate audio systems.

The ADAU1451 interface with a wide range of analog-to-digital converters (ADCs), digital-to-analog converters (DACs), digital audio devices, amplifiers, and control circuitry, due to their highly configurable serial ports, S/PDIF interfaces (on the ADAU1451), and multipurpose input/output pins. The devices can also directly interface with pulse density modulation (PDM) output microelectromechanical (MEMS) microphones, due to integrated decimation filters specifically designed for that purpose.

Independent slave and master I²C/serial peripheral interface (SPI) control ports allow the ADAU1451 not only to be programmed and configured by an external master device, but also to act as masters that can program and configure external slave devices directly. This flexibility, combined with self boot functionality, enables the design of standalone systems that do not require any external input to operate.

The power efficient DSP core executes full programs, consumes only a few hundred milliwatts (mW) of power, and can run at a maximum program load while consuming less than a watt, even in worst case temperatures exceeding 100°C. This relatively low power consumption and small footprint make the ADAU1451 ideal replacements for large, general-purpose DSPs that consume more power at the same processing load.

Differences between the ADAU1451

The five variants of this device are differentiated by memory, DSP core frequency, availability of S/PDIF interfaces, ASRC configuration, and temperature range.