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 for AD7903
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
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