AD7902

Dual Pseudo Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP
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Product Details

The AD7902 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 port interface (SPI). On the CNVx rising edge, the AD7902 samples an analog input,  IN+ in the range of 0 V to VREF with respect to a ground sense, IN−. 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 AD7902 is available in a 20-lead QSOP package with operation specified from −40°C to +125°C.

APPLICATIONS

  • 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-AD7902 Circuit Diagram

Product Details

The EVAL-AD7902SDZ is an evaluation board designed to demonstrate the low power AD7902 performance and to provide an easy to understand interface for a variety of system applications. The AD7902 is a dual pseudo differential 16-bit, 1 MSPS PulSAR® ADC. A full description of the AD7902 is available in the AD7902 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, J10, J14, 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


Features
  • Full featured evaluation board for the AD7902
  • Versatile analog signal conditioning circuitry
  • On-board reference, reference buffers, and ADC drivers
  • System demonstration board compatible (EVAL-SDP-CB1Z)
  • PC software for control and data analysis of time and frequency domain

Tools & Simulations

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Product Recommendations

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AD7902 Companion parts

Recommended Digital Isolators

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

Recommended External Voltage References

  • 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 a low noise, high accuracy 2.5V reference , we recommend the ADR431 or the ADR4525 .
  • For driving the voltage reference input , we recommend the AD8031, 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.

AD7902 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Discussions

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AD7902 Discussions

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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.


Price Table Help

 
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.