Alternative Parts

  • AD4000
    AD4000

    Throughput up to 2Msps , Lower power, Ease-of-Use features, Smaller package, and Reduced System Complexity

  • AD4004
    AD4004

    Throughput up to 1Msps, Ease-of-Use features, and Reduced System Complexity

Overview

Features and Benefits

  • 16-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
  • INL: ±0.7 LSB typical, ±1.5 LSB maximum
  • SNR
    • 88.5 dB, with on-chip reference
    • 90 dB, with external reference
  • 4.096 V internal reference: typical drift of ±10 ppm/°C
  • Pseudo differential analog input voltage range
    • 0 V to VREF with VREF up to 5.0 V
    • Allows use of any input range
  • See data sheet for additional features

Product Details

The AD7985 is a 16-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 16-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 AD7985 samples an analog input, IN+, between 0 V and REF with respect to a ground sense, IN−. The AD7985 features a very high sampling rate turbo mode (TURBO is high) and a reduced power normal mode (TURBO is low) for low power applications where the power is scaled with the throughput.

In normal mode (TURBO is 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. It is compatible with 1.8 V, 2.5 V, and 2.7 V supplies using the separate VIO supply.

The AD7985 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.

Applications

  • 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

IBIS Models

Reference Designs (1)

Product Recommendations

AD7985 Companion Parts

Recommended Digital Isolators

  • 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, enhanced system-level ESD performance, 2.5 kVrms isolation: ADUM3401.
  • 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.

PCN-PDN Information

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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.