Features and Benefits

  • Four 2V rms Differential Inputs
  • On-chip phase-locked loop (PLL) for master clock
  • Low electromagnetic interference (EMI) design
  • 106 dB analog-to-digital converter (ADC) dynamic range
  • Total harmonic distortion + noise (THD + N): −95 dB
  • Selectable digital high-pass filter
  • 24 bit stereo ADC with 8 kHz to 192 kHz sample rates
  • I2C/SPI controllable for flexibility
  • Software-controllable clickless mute
  • Software power-down
  • Right-justified, left-justified, 
    I2S-justified, and TDM modes
  • Master and slave operation modes
  • 40-lead LFCSP package
  • Qualified for automotive applications
  • Digital volume control with autoramp function

Product Details

The ADAU1978 incorporates four high performance, analog-to-digital converters (ADCs) with 2 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 ADAU1978 uses only a single 3.3 V supply. The part internally generates the required digital DVDD supply. The low power architecture reduces the power consumption. The ADAU1978 is available in a 40-lead LFCSP package. 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.

Note that throughout this 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 system

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 (2)

Software & Systems Requirements

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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.