Dual Differential 16-Bit, 1 MSPS PulSAR 12.0 mW in QSOP

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Product Details

The AD7903 is a dual 16-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDDx, per ADC. It contains two low power, high speed, 16-bit sampling ADCs and a versatile serial interface port. On the CNVx rising edge, the AD7903 samples the voltage difference between the INx+ and INx− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput.

Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIOx supplies.

The AD7903 is available in a 20-lead QSOP package with operation specified from −40°C to +125°C.


  • Battery-powered equipment
  • Communications
  • Automated test equipment (ATE)
  • Data acquisition
  • Medical instrumentation
  • Redundant measurement
  • Simultaneous sampling

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits


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EVAL-AD7903 Circuit Diagram

Product Details

The EVAL-AD7903SDZ is an evaluation board designed to demonstrate the low power AD7903 performance and to provide an easy to understand interface for a variety of system applications. The AD7903 is a dual differential 16-bit, 1 MSPS PulSAR® ADC. A full description of the AD7903 is available in the AD7903 data sheet and should be consulted when using this evaluation board.

The evaluation board is ideal for use with the Analog Devices, Inc., system demonstration platform (SDP) board, EVAL-SDP-CB1Z. The evaluation board interfaces to the SDP board via a 120-pin connector. SMA Connectors J6, J7, J10, and J15 are provided to connect a low noise analog signal source.

The user PC software executable controls the evaluation board over the USB through the SDP board, EVAL-SDP-CB1Z.

On-board components include the following:

ADR435: high precision, buffered band gap 5.0 V reference

AD8031: reference buffer

ADA4841-1: signal conditioning circuit with op amps

ADP7104 and ADP2301: regulators to derive necessary voltage levels on board

Tools & Simulations

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Reference Designs


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CN0374 Circuit Diagram

Product Recommendations

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AD7903 Companion parts

Recommended Digital Isolators

  • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation , we recommend the ADUM3401 .
  • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V) , we recommend the ADUM3481 .
  • For SPI Interface, lowest power, 2.5 kVrms isolation , we recommend the ADUM1401 .
  • For SPI Interface, low power, 5.0 kVrms isolation , we recommend the ADUM4401 .

Recommended External Voltage References

  • For a low noise, high accuracy 2.5V reference , we recommend the ADR431 or the ADR4525 .
  • For a low noise, high accuracy 5V reference , we recommend the ADR435 or the ADR4550 .
  • For a low noise, high accuracy 3V reference , we recommend the ADR433 or the ADR4533 .
  • For driving the voltage reference input , we recommend the AD8031 or the AD8605 .

Recommended Driver Amplifiers

Design Resources

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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.

AD7903 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



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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.

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Evaluation Boards Pricing displayed is based on 1-piece.
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.