AD7631:  18-Bit, 250 kSPS, Differential Programmable Input PulSAR® ADC

The AD7631 is an 18-bit, charge redistribution, successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high ...More

AD7631:  18-Bit, 250 kSPS, Differential Programmable Input PulSAR® ADC

Product Description

The AD7631 is an 18-bit, charge redistribution, successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high voltage process. The device is configured through hardware or via a dedicated write-only serial configuration port for input range and operating mode. The AD7631 contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. A falling edge on CNVST samples the fully differential analog inputs on IN+ and IN−. The AD7631 features four different analog input ranges. Power is scaled linearly with throughput. Operation is specified from −40°C to +85°C.

Applications

  • Process controls
  • High speed data acquisition
  • Digital signal processing
  • Spectrum analysis ATE

    • Data Sheet, Rev. 0, 2/07

    Features

    • Multiple pins/software-programmable input ranges
      +5 V (10 V p-p), +10 V (20 V p-p),
      ±5 V (20 V p-p), ±10 V (40 V p-p)
    • Pins or serial SPI®-compatible input ranges/mode selection
    • Throughput: 250 kSPS
    • INL: ±1.5 LSB typical, ±2.5 LSB maximum (±9.5 ppm of FSR)
    • 18-bit resolution with no missing codes
    • Dynamic range: 102.5 dB
    • SNR: 101 dB @ 2 kHz
    • THD: −112 dB @ 2 kHz
    • iCMOS® process technology
    • 5 V internal reference: typical drift 3 ppm/°C; TEMP output
    • No pipeline delay (SAR architecture)
    • Parallel (18-/16-/8-bit bus) and serial 5 V/3.3 V interface

    Diagrams

    AD7631 Diagram
    Functional Block Diagram for AD7631

    Specifications

    Resolution (Bits) 18bit
    T-Put Rate 250kSPS
    # Chan 1
    Supply V Multi(±15, +5)
    Pwr Diss 120mW
    Interface Par,Ser,SPI
    Ain Range 10V p-p,20 V p-p,40 V p-p
    SNR (dB) 100dB
    Pkg Type CSP,QFP

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    Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
    AD7631 18 250KSPS 1 120mW
    AD7641 18 2MSPS 1 92mW
    AD7643 18 1.25MSPS 1 80mW
    AD7982 18 1MSPS 1 8.6mW
    AD7984 18 1.33MSPS 1 14mW
    AD7679 18 570KSPS 1 103mW
    AD7690 18 400KSPS 1 20mW
    AD7610 16 250KSPS 1 110mW
    AD7621 16 3MSPS 1 86mW
    AD7622 16 2MSPS 1 85mW
    AD7623 16 1.33MSPS 1 55mW
    Pricing, Packaging & Availability

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    Model
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    Status
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    • Pre-Release: The model has not been released to general production, but samples may be available.
    • Production: The model is currently being produced, and generally available for purchase and sampling.
    • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
    • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
    Package Description
    The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

    For detailed drawings and chemical composition please consult our  Package Site

    Pin Count
    Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
    Price
    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.

    Production Availability
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    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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