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Analog Devices Inc. AD7687 16-Bit PulSAR® Differential ADCs

Analog Devices AD7687 16-Bit PulSAR® Differential ADCs are charge redistribution, successive approximation ADCs operating from a single power supply, VDD, between 2.3V to 5.5V. AD7687 includes a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. AD7687 also provides a low noise, wide bandwidth, short aperture delay track-and-hold circuit. The SPI-compatible serial interface offers designers the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and an optional busy indicator. AD7687 is compatible with 1.8V, 2.5V, 3V, or 5V logic using a separate supply (VIO). The reference voltage, VREF, is applied externally and is set up to be the supply voltage. AD7687 power scales linearly with the throughput. Available in a 10-lead MSOP or a 10-lead LFCSP package, AD7687 is specified for operation from −40°C to +85°C. The AD7687 ADCs are well-suited for battery-powered equipment, data acquisition, instrumentation, medical instruments, and process controls.

Features

  • 16-bit resolution with no missing codes
  • Throughput: 250kSPS
  • INL: ±0.4LSB typ, ±1.5LSB max. (±23ppm of FSR)
  • Dynamic range: 96.5dB
  • S/(N + D): 95.5dB at 20kHz
  • THD: −118dB at 20kHz
  • True differential analog input range
    • ±VREF
    • 0V to VREF with VREF up to VDD on both inputs
  • No pipeline delay
  • Single-supply 2.3V to 5.5V operation with 1.8V/2.5V/3V/5V logic interface
  • Proprietary serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP-compatible1
  • Daisy-chain multiple ADCs and BUSY indicator
  • Power dissipation
    • 1.35mW at 2.5 V/100kSPS, 4mW at 5 V/100kSPS, and
    • 1.4μW at 2.5V/100 SPS
  • Standby current: 1nA
  • 10-lead MSOP (MSOP-8 size) and
  • 3mm × 3mm LFCSP (SOT-23 size)
  • Pin-for-pin compatible with AD7685, AD7686, and AD7688

Applications

  • Battery-powered equipment
  • Data acquisitions
  • Instrumentation
  • Medical instruments
  • Process controls

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Published: 2015-04-06 | Updated: 2022-03-11