Features and Benefits

  • 14-bit resolution with no missing codes
  • Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
  • Low power dissipation
    15.5 mW at 2.5 MSPS, with external reference 
    28 mW at 2.5 MSPS, with internal reference
  • SNR
    84 dB, with on-chip reference 
    84.5 dB, with external reference
  • 4.096 V internal reference: typical drift of
    ±10 ppm/°C
  • INL: ±0.25 LSB typical, ±1.0 LSB maximum
  • Pseudo differential analog input voltage range
    0 V to VREF with VREF up to 5.0 V Allows use of any input range
  • No pipeline delay
  • Logic interface: 1.8 V/2.5 V/2.7 V
  • Serial interface: SPI-/QSPI-/MICROWIRE-/DSP-compatible
  • Ability to daisy-chain multiple ADCs with busy indicator
  • 20-lead, 4 mm × 4 mm LFCSP (QFN)

Product Details

The AD7944 is a 14-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 14-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7944 samples an analog input, IN+, between 0 V and VREF with respect to a ground sense, IN−. The AD7944 features a very high sampling rate turbo mode (TURBO high) and a reduced power normal mode (TURBO low) for low power applications where the power is scaled with the throughput.

In normal mode (TURBO low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provide an optional busy indicator. The serial interface is compatible with 1.8 V, 2.5 V, and 2.7 V supplies using the separate VIO supply.

The AD7944 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.


  • Battery-powered equipment
  • Communications
  • ATE
  • Data acquisition systems
  • Medical instruments

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 (1)

Tools & Simulations

Precision ADC Driver Tool

The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input

Precision ADC Driver Tool

IBIS Models

Product Recommendations

AD7944 Companion Parts

Recommended Driver Amplifiers

Recommended External References

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.

PCN-PDN Information

Sample & Buy

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Evaluation Boards

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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.