1. Products
  2. A/D Converters (ADC)
  3. Precision A/D Converters
  4. Simultaneous Sampling A/D Converters
  5. AD7903


Overview

Features and Benefits

  • 16-bit resolution with no missing codes
  • Throughput: 1 MSPS
  • Low power dissipation
    7.0 mW at 1 MSPS (VDD1 and VDD2 only)
    12.0 mW at 1 MSPS (total)
    140 µW at 10 kSPS
  • INL: ±0.5 LSB typical, ±2.0 LSB maximum
  • True differential analog input range: ±VREF
    0 V to VREF with VREF between 2.4 V to 5.1 V
    Allows use of any input range
    Easy to drive with the ADA4941-1
  • SINAD: 93.5 dB at 1 kHz
  • THD: −112 dB at 1 kHz
  • No pipeline delay
  • Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
  • Serial interface SPI/QSPI/MICROWIRE/DSP compatible
  • 20-lead QSOP package
  • Wide operating temperature range: −40°C to +125°C

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.

APPLICATIONS

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

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)

Documentation & Resources

  • View All (14)
  • Data Sheet (1)
  • Application Note (3)
  • User Guide (1)
  • Product Highlight (2)
  • Tutorial (2)
  • Product Selection Guide (1)
  • Circuit Note (1)
  • Technical Article (3)
  • 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 Model

    Reference Designs (1)

    Product Recommendations

    AD7903 Companion Parts

    Recommended Digital Isolators

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

    Recommended External Voltage References

    Recommended Driver Amplifiers

    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.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD7903BRQZ Material Declaration Reliability Data 20-Lead QSOP
    AD7903BRQZ-RL7 Material Declaration Reliability Data 20-Lead QSOP
    Wafer Fabrication Data

    Sample & Buy


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    Sampling


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    Price Table Help

     

    Evaluation Boards

    Pricing displayed is based on 1-piece.

    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    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.