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AD7690:  18-Bit, 1.5 LSB INL, 400 kSPS PulSAR® Differential ADC in MSOP/QFN

The AD7690 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN− pins. The voltages on these pins ...More

AD7690:  18-Bit, 1.5 LSB INL, 400 kSPS PulSAR® Differential ADC in MSOP/QFN

Product Description

The AD7690 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN− pins. The voltages on these pins swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.

The power of the AD7690 scales linearly with the 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 VIO supply.

The AD7690 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.

Applications

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

    • Data Sheet, Rev. A, 3/07

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    • 18-bit resolution with no missing codes
    • Throughput: 400 kSPS
    • INL: ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR)
    • Dynamic range: 102 dB @ 400 kSPS
    • Oversampled dynamic range: 125 dB @ 1 kSPS
    • Noise-free code resolution: 20 bits @ 1 kSPS
    • Effective resolution: 22.7 bits @ 1 kSPS
    • SINAD: 101.5 dB @ 1 kHz
    • THD: −125 dB @ 1 kHz
    • True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs
    • No pipeline delay
    • Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
    • Resolution (Bits): 18bit
    • T-Put Rate: 400kSPS
    • # Chan: 1
    • Supply V: Single(+5)
    • Pwr Diss: 20mW
    • Interface: Ser,SPI
    • Ain Range: (2Vref) p-p
    • SNR (dB): 101.5dB
    • Pkg Type: CSP,SOP

    Functional Block Diagram for AD7690

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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.