AD7902BRQZ-RL7

Overview

The AD7902BRQZ-RL7 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 analog supply and supports digital logic interfaces ranging from 1.8 V to 5 V. The device achieves a throughput of 1 MSPS with a total power dissipation of 12 mW at full speed. Key performance metrics include a signal-to-noise ratio of 91.5 dB and a total harmonic distortion of -105 dB at 1 kHz input frequency. It features pseudo-differential inputs, an external reference range of 2.4 V to 5.1 V, and is housed in a 20-lead QSOP package.

Feature Summary

• Dual-channel architecture enabling simultaneous sampling of two independent analog signals.
• Low-power SAR design with power consumption scaling linearly with throughput.
• Versatile serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols.
• No pipeline delay allows immediate availability of conversion results.

Applications

• Battery-powered equipment
• Automated test equipment (ATE)
• Medical instrumentation
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix RL7 confirms the reel packaging format required for automated assembly processes. Ensure the component matches the BRQZ designation for the specified temperature range and package type. Cross-reference the manufacturer part number with official distributor catalogs to confirm current availability status and compliance with relevant environmental directives before finalizing procurement orders.

Selection Notes

Select this component when simultaneous sampling of two channels is required within a low-power constraint. Verify that the host system supports the necessary serial clock rates for the chosen operating voltage. Ensure the external reference voltage falls within the 2.4 V to 5.1 V range to maintain specified accuracy. Consider the 20-lead QSOP footprint during PCB layout to accommodate the required decoupling capacitors near the reference pins.

Part Context

This part belongs to the PulSAR ADC family, characterized by high precision and low power consumption. It serves as a dual-channel variant within the broader AD7902 series, offering pin-for-pin compatibility with differential input versions like the AD7903. The device integrates on-chip track-and-hold circuits, simplifying driver amplifier requirements for high-speed applications.

Replacement Considerations

The AD7903BRQZ-RL7 is a pin-compatible alternative featuring differential inputs instead of pseudo-differential inputs. Other members of the PulSAR family may offer different resolutions or channel counts but require verification of electrical compatibility and software interface alignment.