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AD8251ARMZ

ADIAD8251ARMZ

Analog Devices Inc.
Instrumentation Amplifier 1 Circuit 10-MSOP
Active1,335 in stock
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Overview

The AD8251ARMZ is a digitally programmable gain instrumentation amplifier (PGIA) that offers gains of 1, 2, 4, and 8 via a parallel interface. It features a high slew rate of 30V/us and a wide 10 MHz bandwidth, making it suitable for high-speed data acquisition systems. With a low input offset voltage of 70 uV and a 5 nA input bias current, it maintains high precision across its gain settings.

Why Choose This Part

The AD8251 provides exceptional speed for an instrumentation amplifier, featuring a 30V/us slew rate and fast settling time. Its ability to change gains digitally without external resistors simplifies PCB layout and improves system accuracy by eliminating gain-setting resistor tolerances. The wide supply range of 10V to 30V allows for large common-mode voltage swings in industrial environments.

Applications

Data Acquisition Systems
Used as a front-end buffer to scale varying signal levels for high-speed ADCs.
Industrial Process Control
Interfacing with bridge sensors and transducers where variable gain is required for different measurement ranges.
Automated Test Equipment
Dynamic signal conditioning in ATE environments requiring rapid gain switching and high throughput.
Medical Instrumentation
Precision amplification for diagnostic equipment where high CMRR and low offset are critical.

Key Specifications

Slew Rate 30V/us
Mounting Type Surface Mount
-3db Bandwidth 10 MHz
Amplifier Type Instrumentation
Package / Case 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Current - Supply 4.1mA
Number of Circuits 1
Current - Input Bias 5 nA
Operating Temperature -40degC ~ 85degC
Voltage - Input Offset 70 uV
Supplier Device Package 10-MSOP
Current - Output / Channel 37 mA
Voltage - Supply Span (Max) 30 V
Voltage - Supply Span (Min) 10 V

Getting Started

When designing with the AD8251, ensure high-frequency decoupling capacitors are placed as close to the supply pins as possible to maintain stability during high-speed transients. The digital gain pins (A0, A1) are TTL/CMOS compatible and can be driven directly by a microcontroller or FPGA. For prototyping, the AD8251-EVALZ evaluation board provides a pre-configured layout to test gain switching performance and signal integrity.

Also Consider

AD8250ARMZ ADIAnalog Devices Inc. - Offers different gain steps of 1, 2, 5, and 10 for applications requiring decimal-based scaling.
AD8253ARMZ ADIAnalog Devices Inc. - Features higher gain settings of 1, 10, 100, and 1000 for extremely low-level signal conditioning.