ADAU1978:  Quad ADC (2V Input)

Product Details

Product Status:Recommended for New Designs

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


  • 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
  • Digital volume control with autoramp function
  • 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

Functional Block Diagram for ADAU1978

Similar Products

  • ADAU1977: Quad ADC with Diagnostics ( 10V Input)
  • ADAU1979: Quad ADC (4.5V Input)

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADAU1977 Sound CODEC Linux Driver (Wiki Site) Device Drivers HTML

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ADAU1978 Model Options
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADUSB2EBZ Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADUSB2EBZ Status: Production USB Interface $80.00 Yes -

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.

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