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AD8231

ADIAD8231

MPN: AD8231ACPZ-R7
Analog Devices Inc.
Instrumentation Amplifier 1 Circuit Rail-to-Rail 16-LFCSP (4x4)
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Overview

The AD8231 is a zero-drift, rail-to-rail instrumentation amplifier featuring digitally programmable gains from 1 to 128 in binary steps. It operates on a single supply from 3V to 5V and includes an uncommitted operational amplifier for additional signal conditioning tasks such as filtering or buffering. The device is qualified for automotive applications and maintains high performance across a wide temperature range of -40 to 125 degrees Celsius.

Why Choose This Part

The AD8231 eliminates the need for external gain-setting resistors, ensuring high gain accuracy and excellent common-mode rejection. Its zero-drift architecture provides a maximum offset voltage of 50 microvolts, while the integrated auxiliary op-amp saves PCB space in complex signal chains.

Applications

Pressure Sensor Interface
Precisely amplifies bridge-based pressure sensor signals in industrial environments where low offset and drift are critical.
Data Acquisition Systems
Acts as a front-end for ADCs, using its programmable gain to maximize dynamic range for various input signal levels.
Automotive ECU Sensing
Monitors current and voltage in automotive electronic control units, utilizing its AEC-Q100 qualification and rail-to-rail capability.
Medical Instrumentation
The 250pA input bias current and high CMRR make it suitable for low-frequency biopotential measurements.

Key Specifications

Slew Rate 1.1V/us
Output Type Rail-to-Rail
Mounting Type Surface Mount
Amplifier Type Instrumentation
Package / Case 16-WQFN Exposed Pad, CSP
Current - Supply 4mA
Number of Circuits 1
Current - Input Bias 250 pA
Operating Temperature -40degC ~ 125degC
Gain Bandwidth Product 7 MHz
Voltage - Input Offset 4 uV
Supplier Device Package 16-LFCSP (4x4)
Current - Output / Channel 70 mA
Voltage - Supply Span (Max) 5 V
Voltage - Supply Span (Min) 3 V

Getting Started

For evaluation, utilize the AD8231-EVALZ board which allows for quick testing of gain settings and performance. Digital gain control pins can be tied directly to a microcontroller GPIO or hard-wired to logic levels for fixed-gain applications.

Also Consider

AD8250 ADIAnalog Devices Inc. - Provides much higher bandwidth and faster settling times for high-speed data acquisition applications.