AD7863BR-3

Overview

The AD7863BR-3 is a dual-channel, 14-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single 5 V supply and features simultaneous sampling and conversion at a throughput rate of 175 kSPS with a conversion time of 5.2 μs. The device includes two track-and-hold amplifiers, an internal 2.5 V reference, and a high-speed parallel interface. It supports four analog input channels grouped into two channels (A and B), selectable via the A0 pin. The AD7863-3 variant provides a bipolar input voltage range of ±2.5 V and offers overvoltage protection up to ±7 V.

Feature Summary

• Simultaneous sampling and conversion of two independent channels preserves relative phase information between signals.
• Integrated internal 2.5 V reference allows for simplified system design without external components.
• High-speed parallel interface enables direct connection to microprocessors and digital signal processors.
• Automatic power-down mode reduces power consumption significantly during idle periods.

Applications

• Vector motor control systems requiring precise phase measurement.
• Battery-powered or portable applications benefiting from low power operation.
• Industrial data acquisition systems utilizing standard ±2.5 V signal ranges.

Procurement Notes

Verify the specific suffix 'B' indicates the commercial temperature grade (-40°C to +85°C) as defined in the datasheet specifications table. Confirm package availability matches the required SOIC_W or SSOP form factor. Ensure ordering documentation references the correct input range variant '-3' for ±2.5 V operation. Cross-reference manufacturer part numbers against distributor listings to confirm authenticity and revision status.

Selection Notes

Select the AD7863BR-3 when a dual-channel 14-bit resolution with simultaneous sampling is required for ±2.5 V input signals. This component is suitable for designs needing a 5 V single-supply operation and a parallel interface. Consider the 175 kSPS throughput limit and 5.2 μs conversion time for timing constraints. Evaluate the internal reference accuracy against application requirements before opting for external reference solutions.

Part Context

The AD7863 series serves as a 14-bit lead-compatible upgrade to the AD7862 family. It utilizes Analog Devices' LC2MOS process, combining precision bipolar circuits with low-power CMOS logic. The BR-3 designation specifically denotes the B-grade temperature performance within the -3 input range configuration, distinguishing it from the A-grade and other voltage variants like the AD7863-10 or AD7863-2.

Replacement Considerations

The AD7863AR-3Z is a verified equivalent part number offering identical electrical characteristics and functionality. Both parts share the same pinout, specifications, and operational modes. Verify that the replacement part meets the required temperature range and package type for the specific application environment.