Analog Devices Inc. AD8209WBRMZ-R7

Overview

AD8209WBRMZ-R7 from Analog Devices is a high-voltage, precision difference amplifier optimized for high-side current sensing in automotive and industrial motor/solenoid control 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 amplification of millivolt-level shunt voltages under rapidly varying rail conditions.

For engineers reviewing the AD8209WBRMZ-R7 datasheet, AD8209WBRMZ-R7 pinout, AD8209WBRMZ-R7 application, or AD8209WBRMZ-R7 equivalent, this page provides verified functional context, validated pin roles, confirmed automotive-grade performance specs (AEC-Q100, −40°C to +125°C), and real-world current-sensing implementation guidance - all grounded in the official Rev. C datasheet and Analog Devices' MSOP-8 package documentation.

Technical Context

The AD8209WBRMZ-R7 implements a two-stage architecture: a precision-trimmed preamplifier (A1) with 7 V/V gain and 100 kΩ output resistance, followed by a buffered stage (A2) with 2 V/V gain, yielding a fixed 14 V/V composite gain when Pins 3 (A1) and 4 (A2) are shorted. Its input resistor network (RA/RB/RC ≈ 400 kΩ total) attenuates common-mode voltage by 1/14 while preserving differential signal integrity.

Laser-trimmed resistor ratios achieve <0.01% matching, ensuring ≥80 dB CMRR up to 10 kHz. EMI filtering is integrated on both inputs, and the 350 mV internal bias enables operation down to −2 V common-mode - critical for detecting recirculation current during low-side switch turn-off in inductive loads.

Key Specifications

Pinout & Package

AD8209WBRMZ-R7 is housed in an 8-lead Mini Small Outline Package (MSOP-8, RM-8), JEDEC MO-187-AA compliant, with 0.65 mm pitch and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4080TASA+ and INA240A1QDRQ1, the AD8209WBRMZ-R7 uniquely combines AEC-Q100 qualification, ±8000 V HBM, integrated EMI filters, and accessible preamplifier output (Pin 3) for flexible low-pass filtering - making it the only choice for robust, filter-integrated high-side sensing in automotive solenoid and motor control.

Availability

AD8209WBRMZ-R7 is available at Aetrix Electronics and suitable for automotive motor control, industrial solenoid actuation, and diagnostic current monitoring requiring stable component supply across extended temperature and high-voltage transient conditions.

Supply support for AD8209WBRMZ-R7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8209 belongs to Analog Devices' precision current-sense amplifier product line, engineered specifically for high-common-mode, high-reliability automotive and industrial power control applications - emphasizing AEC-Q100 compliance, ESD robustness, and integrated signal conditioning.

FAQ

What is the maximum common-mode voltage the AD8209WBRMZ-R7 can handle continuously?

The AD8209WBRMZ-R7 supports continuous input common-mode voltages from −2 V to +45 V at 5 V supply, as specified in the Rev. C datasheet Table 1. Its survival rating extends to −24 V to +80 V, enabling reliable operation during automotive load-dump transients and inductive kickback events without damage or saturation.

Does the AD8209WBRMZ-R7 require external components to achieve its default 14 V/V gain?

No, the AD8209WBRMZ-R7 achieves its default 14 V/V system gain intrinsically by cascading its internal 7 V/V preamplifier (A1) and 2 V/V buffer (A2). This requires only a short between Pins 3 (A1) and 4 (A2); no external resistors are needed for nominal operation per Figure 23 and Table 1 of the datasheet.

Can the AD8209WBRMZ-R7 be used for low-side current sensing?

Yes, the AD8209WBRMZ-R7 supports low-side current sensing configurations, as documented in the "Low-Side Current Sensing" section (Page 12) of the datasheet. Its high CMRR and input impedance reject ground noise, delivering linear output regardless of differential input voltage - ideal for ground-referenced shunt placements in motor drivers.

What is the purpose of Pin 3 (A1) on the AD8209WBRMZ-R7?

Pin 3 (A1) provides access to the preamplifier output node, which features a precise 100 kΩ series resistance. This enables straightforward implementation of single-pole or two-pole low-pass filters (via capacitor-to-ground or Sallen-Key topologies) and external gain adjustment - capabilities explicitly detailed in Figures 32–33 and the "Low-Pass Filtering" section (Page 14).

Is the AD8209WBRMZ-R7 pin-compatible with other members of the AD8209 family?

Yes, all AD8209 variants - including AD8209WBRMZ-R7 (WB grade, −40°C to +125°C) and AD8209WHRMZ-R7 (WH grade, −40°C to +150°C) - share identical MSOP-8 pinout, electrical functionality, and footprint per the Ordering Guide and Pin Configuration (Page 6) of the Rev. C datasheet; only temperature grade and branding differ.