AD7903BRQZ

Overview

The AD7903BRQZ 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 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 12.0 mW at maximum speed. Key performance metrics include a Signal-to-Noise and Distortion Ratio (SINAD) of 93.5 dB at 1 kHz input frequency and a Total Harmonic Distortion (THD) of −112 dB. It features true differential analog inputs with a range of ±VREF and an external reference voltage capability between 2.4 V and 5.1 V.

Feature Summary

• Dual simultaneous sampling architecture for synchronized data acquisition
• True differential analog input range compatible with any input span via external reference
• Versatile serial interface supporting SPI, QSPI, MICROWIRE, and DSP modes
• Low power consumption scaling linearly with throughput

Applications

• Battery-powered equipment requiring low power operation
• Automated test equipment (ATE)
• Medical instrumentation
• Data acquisition systems
• Redundant measurement applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct package type and temperature rating. Confirm that the required voltage levels for VDDx and VIOx align with the system design specifications before procurement.

Selection Notes

Select this component when simultaneous sampling of two channels is required within a 16-bit resolution constraint. Ensure the application can accommodate the 20-lead QSOP package dimensions and provides adequate thermal management for the specified operating temperature range.

Part Context

This part belongs to the PulSAR ADC family from Analog Devices. It is pin-for-pin compatible with the AD7902, which offers pseudo-differential inputs instead of true differential inputs. Both devices share similar power profiles and interface requirements.

Replacement Considerations

The AD7902BRQZ is a confirmed pin-compatible substitute offering pseudo-differential inputs. Other family members like the AD7903ARQZ may differ in temperature grade or packaging variations.