Analog Devices Inc. AD8209WHRMZ

Overview

AD8209WHRMZ from Analog Devices is a high-voltage, AEC-Q100-qualified precision difference amplifier designed for high-side current sensing in automotive powertrain and chassis systems. It delivers 14 V/V system gain, ±1 mV input offset (RTI), 80 dB minimum CMRR (dc to 10 kHz), and operates from −2 V to +45 V common-mode voltage at 5 V supply - enabling accurate shunt-based current monitoring in 12 V/24 V battery-referenced motor control circuits.

For engineers reviewing the AD8209WHRMZ datasheet, AD8209WHRMZ pinout, AD8209WHRMZ application, or AD8209WHRMZ equivalent, this device is selected for robust high-common-mode-voltage signal conditioning where automotive-grade temperature range (−40°C to +150°C), EMI filtering, and ±8000 V HBM ESD protection are mandatory design requirements.

Technical Context

The AD8209WHRMZ implements a two-stage architecture: a precision-trimmed preamplifier (A1) with 7 V/V gain and buffered output at Pin 3, followed by a unity-gain-configurable buffer (A2) with 2 V/V default gain. Its laser-trimmed resistor network achieves <0.01% ratio matching, enabling 80 dB CMRR across dc–10 kHz while surviving −24 V to +80 V input common-mode transients.

It integrates three on-chip EMI filters (on IN+, IN−, and A1 pins), supports external low-pass filtering via the accessible 100 kΩ A1 output resistor, and features internal 350 mV biasing to enable operation down to −2 V common-mode - critical for detecting recirculation current during low-side switch turn-off in solenoid drivers.

Key Specifications

Pinout & Package

AD8209WHRMZ is housed in an 8-lead MSOP (RM-8) package per JEDEC MO-187-AA, with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX40016ATA+T and INA240A1QDRQ1, AD8209WHRMZ uniquely combines AEC-Q100 Grade 0 qualification, integrated EMI filters, and stable 80 dB CMRR up to 10 kHz - making it the only option qualified for safety-critical, high-noise automotive motor control without external filtering components.

Availability

AD8209WHRMZ is available at Aetrix Electronics and suitable for automotive powertrain control, electric power steering (EPS), and transmission solenoid management requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD8209WHRMZ 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 AD8209 belongs to Analog Devices' precision current sensing amplifier product line, engineered specifically for AEC-Q100-compliant high-side and high-rail current monitoring in harsh automotive environments.

FAQ

What is the maximum common-mode voltage AD8209WHRMZ can survive continuously?

AD8209WHRMZ survives −24 V to +80 V continuous input common-mode voltage per Absolute Maximum Ratings. This exceeds ISO 7637-2 Pulse 5a (load dump) and Pulse 5b (reverse battery) test levels, enabling direct connection to 24 V truck battery rails without external protection circuitry. The operating range remains −2 V to +45 V at 5 V supply.

Does AD8209WHRMZ require external components to achieve its specified 14 V/V gain?

No. AD8209WHRMZ achieves 14 V/V system gain by default when Pin 3 (A1 output) is shorted to Pin 4 (A2 input), leveraging its internal 7 V/V preamplifier and 2 V/V buffer stages. No external resistors are needed for nominal gain - only for gain adjustment (lower or higher than 14 V/V) or low-pass filtering.

How does the AD8209WHRMZ handle EMI in high-noise automotive environments?

AD8209WHRMZ integrates three on-chip EMI filters - one each on IN+, IN−, and A1 pins - optimized to suppress >100 MHz RF interference from ignition systems and motor commutation. These filters eliminate need for external ferrite beads or RC networks while maintaining full dc–80 kHz signal bandwidth.

Can AD8209WHRMZ be used for low-side current sensing?

Yes. AD8209WHRMZ supports low-side current sensing configurations where the shunt is placed between load and ground. Its high CMRR (>80 dB) rejects ground noise, and its 360 kΩ differential input impedance minimizes loading effects - delivering high linearity and accuracy even with noisy ground returns in chassis-mounted systems.

What is the purpose of the 100 kΩ resistor accessible at Pin 3 (A1)?

The 100 kΩ resistor at Pin 3 (A1) provides direct access to the preamplifier output, enabling user-configurable low-pass filtering (single-pole or two-pole) and gain adjustment. Connecting a capacitor from Pin 3 to GND forms a single-pole filter; adding external resistors allows gain scaling below or above 14 V/V without degrading bandwidth or introducing additional noise sources.