Analog Devices Inc. AD7902 Analog to Digital Converter

Analog Devices Inc. AD7902 Analog to Digital Converters are a dual 16-bit, successive approximation ADC that operates from a single power supply, VDDx, per ADC. It contains two low power, high speed, 16-bit sampling ADCs and a versatile serial port interface (SPI). On the CNVx rising edge, the AD7902 samples an analog input, IN+, in the range of 0 V to VREF with respect to a ground sense, IN−.

The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput. Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8V, 2.5V, 3V, or 5V logic, using the separate VIOx supplies.


  • 16-bit resolution with no missing codes
  • Throughput: 1MSPS
  • Low power dissipation
    • 7.0mW at 1MSPS (VDD1 and VDD2 only)
    • 12.0mW at 1MSPS (total)
    • 140μW at 10kSPS
  • INL: ±1.0 LSB typical, ±2.5 LSB maximum
  • SINAD: 91dB at 1kHz
  • THD: −105 dB at 1kHz
  • Pseudo-differential analog input range
    • 0V to VREF with VREF between 2.4V to 5.1V
    • Allows use of any input range
    • Easy to drive with the ADA4841-x
  • No pipeline delay
  • Single-supply 2.5V operation with 1.8V/2.5V/3V/5V logic interface
  • Serial port interface (SPI) QSPI/MICROWIRE/DSP compatible
  • 20-lead QSOP package
  • Wide operating temperature range: −40°C to +125°C


  • Battery-powered equipment
  • Communications
  • Automated test equipment (ATE)
  • Data acquisition
  • Medical instrumentation
  • Redundant measurement
  • Simultaneous sampling

Block Diagram

Analog Devices Inc. AD7902 Analog to Digital Converter


Publicado: 2014-04-21 | Actualizado: 2022-03-11