Analog Devices Inc. AD8208WHRZ

Overview

AD8208WHRZ from Analog Devices is a high-voltage, precision difference amplifier optimized for automotive-grade high-side current sensing in motor and solenoid controls. It delivers 20 V/V system gain, ±4 mV input offset over temperature, −2 V to +45 V common-mode input range at 5 V supply, and operates from −40°C to +150°C. Its integrated EMI filters and 80 dB minimum CMRR support robust diagnostics in noisy 12 V/24 V battery systems.

For engineers reviewing the AD8208WHRZ datasheet, AD8208WHRZ pinout, AD8208WHRZ application, or AD8208WHRZ equivalent, this page provides verified specifications, validated pin functions, automotive-qualified thermal performance, and real-world current-sensing implementation guidance - all aligned with Rev. C datasheet and WH-grade qualification.

Technical Context

The AD8208WHRZ implements a two-stage architecture: a precision preamplifier (A1) with 10 V/V gain and 100 kΩ output resistance, followed by a buffered stage (A2) with 2 V/V gain, yielding fixed 20 V/V composite gain when pins A1 and A2 are shorted. Its laser-trimmed resistor network achieves <0.01% ratio matching, enabling ≥80 dB dc-to-10 kHz CMRR despite wide common-mode swings.

Input attenuation (1/14) and internal 350 mV bias allow operation down to −2 V common-mode while maintaining rail-to-rail functionality. The externally accessible A1 output enables configurable low-pass filtering (1-pole or 2-pole) and gain adjustment via external resistors - critical for PWM-based motor control feedback loops requiring noise rejection and calibrated scaling.

Key Specifications

Pinout & Package

AD8208WHRZ is housed in an 8-lead SOIC_N package (JEDEC MS-012-AA), 5.00 mm × 4.00 mm body, 1.27 mm pitch, with gull-wing leads and coplanarity ≤0.10 mm. Pin 6 is NC (no connect); all other pins are electrically active per functional block diagram.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar difference amplifier applications.

Compared with INA240A1QDRQ1 and MAX40016ATA+T, AD8208WHRZ uniquely combines AEC-Q100 Grade 0 qualification, integrated EMI filters, and externally accessible A1 output - enabling single-chip solutions for automotive motor control with adaptive noise filtering and gain calibration.

Availability

AD8208WHRZ is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and battery protection systems requiring stable component supply across extended temperature and high-reliability lifecycle demands.

Supply support for AD8208WHRZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, and communications markets since 1965.

The AD8208 belongs to Analog Devices' precision current-sense amplifier product line, engineered specifically for automotive-grade high-side sensing in harsh environments with rapid common-mode transients and stringent EMC requirements.

FAQ

What is the maximum common-mode voltage AD8208WHRZ can survive without damage?

AD8208WHRZ survives −24 V to +80 V continuous common-mode voltage per Absolute Maximum Ratings (Table 2). This exceeds ISO 7637-2 Pulse 5a requirements for automotive battery systems and enables use in 48 V mild-hybrid architectures where load-dump transients reach +75 V. Operation remains functional within −2 V to +45 V at 5 V supply.

How does AD8208WHRZ achieve 80 dB CMRR with such wide common-mode range?

AD8208WHRZ achieves ≥80 dB CMRR through laser-trimmed resistor networks matching within 0.01%, combined with balanced 400 kΩ input impedance and internal 350 mV bias that keeps A1 inputs within supply rails. The 1/14 input attenuation reduces common-mode swing before amplification, while the dual-stage architecture isolates differential gain from common-mode errors.

Can AD8208WHRZ be used for low-side current sensing?

Yes, AD8208WHRZ supports low-side current sensing per Applications Information (Page 12). Its high CMRR rejects ground noise from shared return paths, and its −2 V common-mode capability accommodates shunt voltages below ground during inductive kickback. Performance matches high-side use with identical gain, offset, and bandwidth specs.

What is the purpose of the A1 and A2 pins on AD8208WHRZ?

Pin 3 (A1) is the preamplifier output with 100 kΩ series resistance; Pin 4 (A2) is the buffer input. Shorting them configures default 20 V/V gain. Leaving them open enables external RC filtering or resistor-based gain adjustment - allowing 1-pole/2-pole LPF design or gain scaling from 10 V/V to 50 V/V without additional components.

Is AD8208WHRZ pin-compatible with other grades like AD8208WBRZ?

Yes, AD8208WHRZ shares identical SOIC_N pinout and electrical behavior with AD8208WBRZ and AD8208WBRM, differing only in temperature grade (−40°C to +150°C vs. −40°C to +125°C) and quiescent current (3.0 mA vs. 2.7 mA at max temp). PCB layout and firmware require no changes when upgrading to WH grade for under-hood deployment.