AD7902BRQZ

Overview

The AD7902BRQZ is a dual-channel, 16-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates from a single 2.5 V supply with a throughput rate of 1 MSPS per channel. The device features pseudo-differential analog inputs ranging from 0 V to the external reference voltage (VREF), which can be set between 2.4 V and 5.1 V. Power dissipation scales linearly with throughput, reaching 12.0 mW at maximum speed. It utilizes a serial peripheral interface (SPI) compatible with QSPI, MICROWIRE, and DSP standards, supporting daisy-chaining. The component is housed in a 20-lead QSOP package and functions within an industrial temperature range of −40°C to +125°C.

Feature Summary

• Dual-channel simultaneous sampling capability with no pipeline delay for immediate data availability.
• Low power consumption that scales linearly with throughput, enabling efficient battery-powered operation.
• Versatile serial interface supporting multiple modes including chip select and daisy-chain configurations.
• Pseudo-differential input architecture allowing flexible input ranges relative to the external reference.

Applications

• Battery-powered equipment requiring low power consumption
• Automated test equipment (ATE)
• Medical instrumentation
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure correct packaging and temperature grade. Confirm that the required logic voltage levels for the VIO pins are compatible with the host system interface before integration. Check for any recent revision updates that may affect pin compatibility or electrical specifications.

Selection Notes

Select this component when dual-channel 16-bit resolution and 1 MSPS throughput are required in a compact surface-mount package. Ensure the application supports an external reference voltage within the 2.4 V to 5.1 V range. Verify that the host microcontroller supports the required SPI timing parameters and interface modes for proper data retrieval.

Part Context

The AD7902 belongs to the PulSAR ADC family from Analog Devices, designed for high-speed, low-power applications. It is pin-for-pin compatible with the differential-input AD7903, facilitating design flexibility. The device integrates on-chip track-and-hold amplifiers and does not require an external conversion clock, simplifying system design.

Replacement Considerations

The AD7903 is a pin-compatible alternative offering differential inputs instead of pseudo-differential inputs while maintaining similar performance characteristics.