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Introducing the AD7902 and AD7903 PulSAR analog-to-digital converters (ADC) from Analog Devices

Meter-on-a-Chip

The AD7902 and AD7903 devices are dual 16-bit, successive approximation, analog-to-digital converters (ADC) that operates from a single power supply, VDDx, per ADC. They contain two low power, high speed, 16-bit sampling ADCs and a versatile serial port interface (SPI).

The AD7902 has a pseudo differential analog input range which samples the analog input IN+ in the range of 0 V to VREF with respect to a ground sense IN−. The AD7903 has a true differential analog input range which samples the voltage difference between the INx+ and INx− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF.

On both devices the externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx and the power scales linearly with throughput. The AD7902/3 devices offer 16-bit resolution with no missing codes and throughput of 1 Million Samples Per Second (MSPS).

Functional block diagram for AD7902
Functional Block Diagram

Functional block diagram for AD7903 Functional Block Diagram

Free sample   
Features
  • 16-bit resolution with no missing codes
  • Throughput: 1 MSPS
  • Low power dissipation
  • INL: ±1.0 LSB typical, ±2.5 LSB maximum (AD7902)
  • INL: ±0.5 LSB typical, ±2.0 LSB maximum (AD7903)
  • SINAD: 91 dB (AD7902) 93.5 dB (AD7903) at 1 kHz
  • THD: -105 dB (AD7902) −112 dB (AD7903) at 1 kHz
  • Pseudo (AD7902) or True (AD7903) differential analog input range
  • 0 V to VREF with VREF between 2.4 V to 5.1 V
  • No pipeline delay
  • Single-supply 2.5 V 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
Application notes User Guides Datasheets

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. The devices are compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIOx supplies.

The AD7902/3 devices are both available in a 20-lead QSOP package with operating temperature range from −40°C to +125°C and can be used in a wide range of applications including

  • Battery-powered equipment
  • Communications
  • Automated test equipment (ATE)
  • Data acquisition
  • Medical instrumentation
  • Redundant measurement
  • Simultaneous sampling
Anglia are offering customers a FREE Evaluation kit for the AD7902 and AD7903 PulSAR Analog to Digital Converters, to register your interest please fill in the form below.

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FREE samples for UK and Ireland customers only, subject to availability.

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