AD7903BRQZ-RL7

Overview

The AD7903BRQZ-RL7 is a dual-channel, 16-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 2.5 V supply and supports a throughput of up to 1 MSPS per channel with simultaneous sampling capability. The device features true differential analog inputs with a range of ±VREF or 0 V to VREF, where VREF can be set between 2.4 V and 5.1 V. Total power dissipation at 1 MSPS is 12.0 mW, scaling down to 140 µW at 10 kSPS. It utilizes an SPI-compatible serial interface compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic levels via separate VIO supplies. The component is housed in a 20-lead QSOP package and is specified for operation over a temperature range of −40°C to +125°C.

Feature Summary

• Dual-channel architecture enabling simultaneous sampling of two independent differential signals without pipeline delay.
• Low-power consumption design that scales linearly with throughput, supporting battery-powered applications.
• Versatile serial interface allowing daisy-chaining of multiple devices on a single bus with optional busy indicator functionality.
• Flexible input range configuration accommodating various signal amplitudes through external reference voltage selection.

Applications

• Battery-powered equipment requiring low power consumption
• Automated test equipment (ATE)
• Medical instrumentation systems
• Redundant measurement architectures

Procurement Notes

Verify the specific ordering suffix RL7 confirms reel packaging when sourcing components. Ensure the digital interface voltage (VIO) matches the host system logic levels, as performance specifications are tied to defined VDD and VIO ranges. Confirm the operating temperature grade aligns with the industrial specification limits provided in the datasheet.

Selection Notes

Select this component when simultaneous sampling of two channels is required within a 16-bit resolution constraint. Consider the AD7902 if pseudo-differential inputs are sufficient, as it offers pin-for-pin compatibility. Evaluate the ADA4941-1 driver amplifier if the source impedance requires buffering to maintain AC accuracy specifications at high frequencies.

Part Context

The AD7903 belongs to the PulSAR ADC family from Analog Devices, designed for high-speed, low-power data acquisition. It shares the same package and pinout as the AD7902 but differs in input architecture, offering true differential inputs instead of pseudo-differential. This distinction allows for better common-mode rejection in noisy environments compared to its counterpart.

Replacement Considerations

The AD7902BRQZ-RL7 is a pin-for-pin compatible alternative offering pseudo-differential inputs. For higher resolution requirements, consider the AD7980 series. For lower speed applications, the AD768x series may provide suitable options.