AD8218BCPZ-WP

Overview

The AD8218BCPZ-WP is a high-voltage, high-resolution current shunt amplifier featuring ZeroDrift technology for bidirectional current sensing. It provides a fixed gain of 20 V/V with a maximum gain error of ±0.35% across the operating temperature range. The device supports a common-mode voltage range from 4 V to 80 V and includes a buffered output compatible with standard analog-to-digital converters. Key electrical specifications include a typical offset drift of ±100 nV/°C, a typical input offset voltage of ±50 µV, and a typical DC common-mode rejection ratio (CMRR) of 110 dB.

Feature Summary

• ZeroDrift architecture ensures low offset drift and high precision over wide temperature ranges
• Bidirectional measurement capability allows accurate monitoring of current flow in both directions
• High common-mode voltage operation supports direct connection to high-side shunts in elevated potential environments

Applications

• High-side current sensing in industrial systems
• 48 V telecommunications power distribution
• Base station power management and bias control
• Bidirectional motor control circuits
• Precision high-voltage current sources

Procurement Notes

Verify the specific suffix WP indicates military-grade qualification or enhanced reliability standards as defined by Analog Devices. Confirm package type LFCSP-WD matches board layout requirements. Ensure supply chain sources provide valid traceability documentation for qualified parts. Cross-reference datasheet revision B specifications against final design constraints.

Selection Notes

Select this component when high accuracy is required in high-common-mode voltage applications. The ZeroDrift feature minimizes calibration needs compared to standard amplifiers. The fixed 20 V/V gain simplifies signal conditioning for ADC interfaces. Consider thermal performance and PCB layout for shunt resistor placement to maintain measurement integrity.

Part Context

This part belongs to the AD8218 family of current sense amplifiers. It shares core functionality with variants like AD8218BRMZ but differs in package and qualification level. The family is designed for robust performance in demanding industrial and telecom environments requiring precise current monitoring.

Replacement Considerations

Direct substitutes within the same family include AD8218BCPZ-RL and AD8218BRMZ-RL. Verify that alternative packages accommodate existing footprint constraints. Ensure functional equivalence regarding gain, common-mode range, and output buffering before substitution.