AD7863BRZ-3

Overview

The AD7863BRZ-3 is a dual-channel, 14-bit successive approximation analog-to-digital converter (ADC) operating from a single 5 V supply. It features simultaneous sampling and conversion at a throughput rate of 175 kSPS with a conversion time of 5.2 μs. The device includes four analog inputs grouped into two channels, selectable via the A0 pin, and supports an input voltage range of ±2.5 V. Key specifications include a typical signal-to-noise ratio of 78 dB, 70 mW power consumption in normal mode, and an internal 2.5 V reference. It utilizes a high-speed parallel interface and offers overvoltage protection up to ±7 V.

Feature Summary

• Simultaneous sampling and conversion on two channels preserves relative phase information between signals.
• Integrated track-and-hold amplifiers acquire input signals to full accuracy within 0.5 μs.
• Internal 2.5 V reference allows for simplified system design without external components.
• Automatic power-down mode reduces power consumption significantly during idle periods.

Applications

• Vector motor control systems requiring precise phase data.
• Portable battery-powered instrumentation due to low power operation.
• Industrial data acquisition systems utilizing standard ±2.5 V signal ranges.

Procurement Notes

Verify the specific suffix -3 indicates the ±2.5 V input range variant when ordering. Confirm package availability matches the required SOIC_W or SSOP form factor. Ensure compatibility with the host microprocessor's parallel interface timing requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring matched aperture delay between channels to maintain phase integrity. Compare the 175 kSPS throughput against system bandwidth needs. Consider the ±2.5 V input range suitability versus other variants like the AD7863-10 if higher voltage swings are present.

Part Context

The AD7863 serves as a 14-bit upgrade to the 12-bit AD7862 while maintaining lead compatibility. It belongs to Analog Devices' family of high-speed, low-power ADCs designed for precision applications. The BRZ-3 designation specifies the industrial temperature range and the specific bipolar input voltage configuration.

Replacement Considerations

The AD7862 is a compatible 12-bit predecessor with identical pinout but lower resolution. For direct replacement, verify that the 14-bit resolution and ±2.5 V input range of the AD7863 meet the system requirements previously handled by the older model.