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AD7643:  18-Bit, 1.25 MSPS PulSAR® A/D Converter

The AD7643 is an 18-bit, 1.25 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part 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. The part has no latency and can ...More

AD7643:  18-Bit, 1.25 MSPS PulSAR® A/D Converter

Product Description

The AD7643 is an 18-bit, 1.25 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part 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. The part has no latency and can be used in asynchronous rate applications. The AD7643 is hardware factory calibrated and tested to ensure ac parameters, such as signal-to-noise ratio (SNR), in addition to the more traditional dc parameters of gain, offset, and linearity. The AD7643 is available in Pb-free only packages with operation specified from −40°C to +85°C.

Product Highlights

  1. Fast Throughput. The AD7643 is a 1.25MSPS, charge redistribution, 18-bit SAR ADC.
  2. Superior Linearity. The AD7643 has no missing 18-bit code.
  3. Internal Reference. The AD7643 has a 2.048 V internal reference with a typical drift of ±10 ppm/°C and an on-chip TEMP sensor.
  4. Single-Supply Operation. The AD7643 operates from a 2.5 V single supply.
  5. Serial or Parallel Interface. Versatile parallel (18-, 16-, or 8-bit bus) or 2-wire serial interface arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.

Applications
  • Medical instruments
  • High speed data acquisition/high dynamic data acquisition
  • Digital signal processing
  • Spectrum analysis
  • Instrumentation
  • Communications
  • ATE

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • Throughput: 1.25 MSPS
    • INL: ±2 LSB typical, ±3 LSB max; ±8 ppm of full scale
    • 18-bit resolution with no missing codes
    • Dynamic range: 95.5 dB
    • SNR: 93.5 dB typical @ 20 kHz (VREF = 2.5 V)
    • THD: −112 dB typical @ 20 kHz (VREF = 2.5 V)
    • No pipeline delay (SAR architecture)
    • 2.048 V internal reference: typ drift 10 ppm/°C; TEMP output
    • Differential input range: ±VREF
      (VREF up to 2.5 V)
    • Parallel (18-, 16-, or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface
    • SPI®/QSPI™/MICROWIRE™/DSP compatible
    • Single 2.5 V supply operation
    • Resolution (Bits): 18bit
    • T-Put Rate: 1.25MSPS
    • # Chan: 1
    • Supply V: Single(+2.5)
    • Pwr Diss: 80mW
    • Interface: Byte,Par,Ser,SPI
    • Ain Range: (2Vref) p-p
    • SNR (dB): 93.5dB
    • Pkg Type: CSP,QFP

    Functional Block Diagram for AD7643

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    Pricing, Packaging & Availability

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    • Pre-Release: The model has not been released to general production, but samples may be available.
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    Package Description
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    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
    This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
    Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

    RoHS Compliant
    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.

    View PCN
    This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement 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.