Features and Benefits

  • Four 4.5 V rms (typical) differential inputs
  • On-chip phase-locked loop (PLL) for master clock
  • Low electromagnetic interference (EMI) design
  • 109 dB (typical) analog-to-digital converter (ADC) dynamic range
  • Total harmonic distortion + noise (THD + N): −95 dB (typical)
  • Selectable digital high-pass filter
  • 24-bit stereo ADC with 8 kHz to 192 kHz sample rates
  • Digital volume control with autoramp function
  • I2C/SPI controllable for flexibility
  • Software-controllable clickless mute
  • Software power-down
  • Right justified, left justified, I2S, and TDM modes
  • Master and slave operation modes
  • 40-lead LFCSP
  • Qualified for automotive applications

Product Details

The ADAU1979 incorporates four high performance, analog-to-digital converters (ADCs) with 4.5 V rms capable ac-coupled inputs. The ADCs use a multibit sigma-delta (Σ-Δ) architecture with continuous time front end for low EMI. An I2C/serial peripheral interface (SPI) control port is included that allows a microcontroller to adjust volume and many other parameters. The ADAU1979 uses only a single 3.3 V supply. The device internally generates the required digital DVDD supply. The low power architecture reduces the power consumption. The on-chip PLL can derive the master clock from an external clock input or frame clock (sample rate clock). When fed with the frame clock, it eliminates the need for a separate high frequency master clock in the system. The ADAU1979 is available in a 40-lead LFCSP package.

Note that throughout the data sheet, multifunction pins, such as SCL/CCLK, are referred to either by the entire pin name or by a single function of the pin, for example, CCLK, when only that function is relevant.


  • Automotive audio systems
  • Active noise cancellation systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (4)

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.