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  2. A/D Converters (ADC)
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  5. AD7986


Alternative Parts

Overview

Features and Benefits

  • 18-bit resolution with no missing codes
  • Throughput: 2 MSPS (TURBO = high), 1.5 MSPS (TURBO = low)
  • Low power dissipation
    • 15 mW at 2 MSPS, with external reference
    • 26 mW at 2 MSPS with internal reference
  • INL: ±1 LSB typical, ±2.5 LSB maximum
  • SNR
    • 95.5 dB, with on-chip reference
    • 97.0 dB, with external reference
  • 4.096 V internal reference: typical drift of 10 ppm/°C
  • True differential analog input voltage range: ±VREF
    • 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 AD7986 is an 18-bit, 2 MSPS successive approximation, analog-to-digital converter (ADC). It contains a low power, high speed, 18-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 AD7986 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. It features a very high sampling rate turbo mode (TURBO = high) and a reduced power normal mode (TURBO = low) for low power applications where the power is scaled with the throughput.

In normal mode (TURBO = low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisychain 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 using the separate VIO supply.

The AD7986 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.

Applications

  • Battery-powered equipment
  • Data acquisition systems
  • Medical instruments
  • Seismic data acquisition systems

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

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

Product Recommendations

AD7986 Companion Parts

Recommended Digital Isolators

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

Recommended External Voltage References

  • For low drift, low noise, low power: ADR4550.
  • For low drift, low noise and low dropout: ADR445.
  • For driving the voltage reference input: AD8031, AD8655.
  • For low drift, low noise and high current output applications: ADR435.

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
AD7986BCPZ Material Declaration Reliability Data 20-Lead LFCSP (4mm x 4mm w/ EP)
AD7986BCPZ-RL7 Material Declaration Reliability Data 20-Lead LFCSP (4mm x 4mm w/ EP)
Wafer Fabrication Data

PCN-PDN Information

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Sample & Buy


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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.