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AD7687:  250 kSPS 16-BIT Differential PulSAR® A/D Converter in µSOIC/QFN

The AD7687 is a 16-bit, 250 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single power supply, VDD between 2.3 V to 5.5 V. It contains a very low power high-speed 16-bit sampling ADC with no missing codes, an internal conversion clock and a versatile serial interface port. The part also contains a low noise, wide bandwidth, very short ...More

AD7687:  250 kSPS 16-BIT Differential PulSAR® A/D Converter in µSOIC/QFN

Product Description

The AD7687 is a 16-bit, 250 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single power supply, VDD between 2.3 V to 5.5 V. It contains a very low power high-speed 16-bit sampling ADC with no missing codes, an internal conversion clock and a versatile serial interface port. The part also contains a low noise, wide bandwidth, very short aperture delay track/hold circuit. On the CNV rising edge, it samples the voltage difference between IN+ and IN- pins. The voltages on these pins usually swing in opposite phase between 0 V to REF. The reference voltage REF is applied externally and can be set up to the supply voltage.

Its power scales linearly with throughput.

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 provides an optional Busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V or 5 V logic using the separate supply VIO.

The AD7687 is housed in a 10-lead µSOIC or 10-lead QFN (Chip Scale package) with operation specified from –40°C to +85°C.

Applications

  • Battery Powered Equipment
  • Medical instruments
  • Mobile communications
  • Personal digital assistants
  • Data Acquisition
  • Instrumentation
  • Medical Instruments
  • Process Control

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    • 16 Bits Resolution with No Missing 16-Bit Codes
    • Throughput: 250 kSPS
    • INL: ±0.4 LSB Typ, ±1.5 LSB Max
    • S/(N+D): 95 dB @ 20 kHz
    • Power Dissipation:
      1.35 mW @ 2.5V/100 kSPS
      1.4 µW @ 2.5 V/100 SPS
    • True Differential Analog input range: ±VREF 0 V to VREF with VREF up to VDD on Both Inputs
    • No Pipeline Delay
    • Single Supply Operation 2.3 V to 5.5 V with 1.8V to 5 V Logic Interface
    • Multiple ADCs Daisy Chain, with BUSY Indicator
    • Serial Interface SPI/QSPI/Wire/DSP compatible
    • µSOIC Package (µSO8 Size) and 3 mm by 3 mm QFN (LFCSP) (SOT23 size)
    • Pin-to-Pin compatible with the AD7685, AD7686, AD7688
    • Resolution (Bits): 16bit
    • T-Put Rate: 250kSPS
    • # Chan: 1
    • Supply V: Single(+2.3 to +5.5),Single(+2.5),Single(+3),Single(+3.3),Single(+5)
    • Pwr Diss: 12.5mW
    • Interface: Ser,SPI
    • Ain Range: (2Vref) p-p
    • SNR (dB): 95.5dB
    • Pkg Type: CSP,SOP

    Functional Block Diagram for AD7687

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