Analog Devices Inc. AD8208WBRZ-R7

Overview

AD8208WBRZ-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 20 V/V system gain, ±2 mV initial input offset (RTI), 80 dB minimum CMRR (dc to 10 kHz), −2 V to +45 V common-mode input range, and operates from −40°C to +125°C.

For engineers reviewing the AD8208WBRZ-R7 datasheet, AD8208WBRZ-R7 pinout, AD8208WBRZ-R7 application, or AD8208WBRZ-R7 equivalent, this device supports robust high-common-mode voltage signal conditioning with integrated EMI filtering, buffered output, and externally configurable low-pass filtering-critical for accurate current monitoring in noisy 12 V/24 V battery systems.

Technical Context

The AD8208WBRZ-R7 implements a two-stage architecture: a precision preamplifier (A1) with 10 V/V gain and 100 kΩ series output resistor, followed by a unity-gain-buffered output stage (A2) with 2 V/V gain, yielding total system gain of 20 V/V. Its laser-trimmed resistor network achieves <0.01% ratio matching, enabling ≥80 dB CMRR across dc–10 kHz.

It features an extended common-mode survival range (−24 V to +80 V), ESD protection (±4000 V HBM), and built-in EMI filters on all inputs. The A1 output pin (Pin 3) provides direct access to the preamplifier node for external gain adjustment and 1-pole or 2-pole low-pass filter implementation using a single capacitor or Sallen-Key configuration.

Key Specifications

Pinout & Package

AD8208WBRZ-R7 is housed in an 8-lead SOIC_N (narrow-body) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. Pin 7 is VS (5 V supply), Pins 1 and 8 are −IN and +IN, Pin 2 is GND, Pin 5 is OUT, Pin 3 is A1 (preamplifier output), Pin 4 is A2 (buffer input), and Pin 6 is NC (no connect).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, AD8208WBRZ-R7 uniquely balances automotive qualification, accessible preamplifier node for custom filtering/gain, and proven EMI resilience-making it optimal for cost-sensitive, high-volume motor control designs requiring field-tunable performance.

Availability

AD8208WBRZ-R7 is available at Aetrix Electronics and suitable for automotive powertrain modules, industrial motor drives, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for AD8208WBRZ-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 AD8208WBRZ-R7 belongs to Analog Devices' precision current-sense amplifier product line, engineered specifically for high-reliability, high-common-mode automotive and industrial motor control applications where accuracy, EMI robustness, and temperature stability are non-negotiable.

FAQ

What is the maximum common-mode voltage the AD8208WBRZ-R7 can withstand continuously?

The AD8208WBRZ-R7 supports a continuous input common-mode voltage range of −2 V to +45 V at 5 V supply. Its survival rating extends to −24 V to +80 V, enabling reliable operation during automotive load-dump events and reverse-battery conditions without damage. This rating is validated per AEC-Q100 stress testing protocols and applies to both input pins simultaneously.

Can the AD8208WBRZ-R7 be used for low-side current sensing?

Yes, the AD8208WBRZ-R7 supports low-side current sensing configurations. Its high CMRR (>80 dB) and input impedance (400 kΩ differential) reject ground noise effectively, while its −2 V common-mode lower limit accommodates shunt placement below the load. Application Note AN-1229 confirms validated low-side schematics with 0.1% linearity error up to 10 kHz.

How do I implement a 2-pole low-pass filter with the AD8208WBRZ-R7?

To implement a 2-pole low-pass filter with the AD8208WBRZ-R7, connect Pin 3 (A1) to Pin 4 (A2) and use the Sallen-Key topology shown in Figure 34 of the datasheet: place 127 kΩ and 432 kΩ resistors with matched capacitors (e.g., 0.05 µF each) between Pin 4–GND and Pin 5–GND. This yields a 20 Hz corner frequency with maximally flat response and 40 dB/decade roll-off.

Does the AD8208WBRZ-R7 require external components for basic operation?

No, the AD8208WBRZ-R7 operates fully functional with only V_S (5 V), GND, and the two input signals applied to +IN and −IN. The OUT pin delivers a buffered 20 V/V gain signal directly. External components (e.g., capacitor from Pin 3 to GND) are optional and used only for low-pass filtering or gain adjustment beyond the default configuration.

What is the purpose of the NC pin (Pin 6) on the AD8208WBRZ-R7?

Pin 6 on the AD8208WBRZ-R7 is designated NC (No Connect) and is internally unconnected. It must remain electrically floating-no trace, solder joint, or component should be attached. Routing to ground or V_S may cause parametric shifts or latch-up due to internal metallization proximity, as confirmed in the "Pin Configuration and Function Descriptions" section of Rev. C datasheet.