Description

The AD8227ARMZ is a low cost, wide supply range instrumentation amplifier designed for use with a variety of signal voltages. It requires only one external resistor to set any gain between 5 and 1000. Its wide input range and rail-to-rail output allow the signal to make full use of the supply rails and can go below the negative supply, which is useful for amplifying small signals near ground without requiring dual supplies.

This model can operate on supplies ranging from ±1.5 V to ±18 V (2.2 V to 36 V single supply) and its inputs are designed to connect to real-world sensors. The device has a robust input range and can handle voltages beyond the rails. With a ±5 V supply, the part is guaranteed to withstand ±35 V at the input with no damage. The AD8227 allows for open wire detection as minimum and maximum input bias currents are specified.

With its MSOP package and 125°C temperature rating, the AD8227ARMZ is ideal for multichannel, space-constrained applications and can thrive in tightly packed, zero airflow designs.

Specifications and features

• Gain set with 1 external resistor
• Gain range: 5 to 1000
• Input voltage goes below ground
• Inputs protected beyond supplies
• Very wide power supply range
• Single supply: 2.2 V to 36 V
• Dual supply: ±1.5 V to ±18 V
• Bandwidth (G = 5): 250 kHz
• CMRR (G = 5): 100 dB minimum (B Grade)
• Input noise: 24 nV/√Hz
• Typical supply current: 350 μA
• Specified temperature: −40°C to +125°C
• 8-lead SOIC and MSOP packages

Application Scenarios

The AD8227ARMZ is commonly used in:

• Industrial process controls
• Bridge amplifiers
• Medical instrumentation
• Portable data acquisition
• Multichannel systems

Comparison

• Requires only one external resistor for gain setting
• Can handle voltages beyond the rails
• Can operate on a wide range of power supplies
• Compact and highly temperature-resistant design

• Input noise is relatively high at 24 nV/√Hz
• CMRR (Common-Mode Rejection Ratio) is 100dB minimum only at a gain of 5 and decreases with other gains