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 ...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

    Features

    • 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

    Diagrams

    AD7690 Diagram
    Functional Block Diagram for AD7690

    Specifications

    Resolution (Bits) 18bit
    T-Put Rate 400kSPS
    # Chan 1
    Supply V Single(+5)
    Pwr Diss (max) 20mW
    Interface Ser,SPI
    Ain Range (2Vref) p-p
    SNR (dB) 101.5dB
    Pkg Type CSP,SOP

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    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD7690 18 400KSPS 1 20mW
    AD7982 18 1MSPS 1 8.6mW
    AD7984 18 1.33MSPS 1 14mW
    AD7980 16 1MSPS 1 10mW
    AD7983 16 1.33MSPS 1 12mW
    AD7946 14 500KSPS 1 19mW
    AD7276 12 3MSPS 1 19.8mW