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 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 (1)

Tools & Simulations

IBIS Models

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.

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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.