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AD8227ARZ-R7

Inst Amp, G=5-1000, 50uV Vos, 300uA Iq, SOIC-8

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Manufacturer Part：

AD8227ARZ-R7

Package：

SOIC-8 (4.9 x 3.9 x 1.5 mm, 1.27mm pitch)

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Description

Product Overview

The AD8227ARZ-R7 from Analog Devices is a low-cost instrumentation amplifier with single-resistor gain setting (5 to 1000), wide supply range, and SOIC-8 package.

Key Specifications

Type Low-Cost Wide Supply Range Instrumentation Amplifier
Gain Range 5 to 1000 (single external resistor)
Gain Formula G = 5 + (80 kOhm / RG)
Input Offset Voltage 50 uV (typical); 125 uV (max, B grade)
Input Offset Drift 0.4 uV/C (typical)
Input Bias Current 1.2 nA (typical)
CMRR 86 dB (min) @ G=5; 114 dB @ G=1000
Bandwidth 725 kHz @ G=5; 130 kHz @ G=100
Slew Rate 0.9 V/us @ G=5
Voltage Noise (RTI) 9.5 nV/sqrt(Hz) @ 1kHz (G=5)
Supply Voltage +/-1.7V to +/-18V (single 3.4V to 36V)
Supply Current 300 uA (typical)
Overvoltage Protection +/-20V (with 5kOhm external resistors)
Package SOIC-8 (R suffix)
Operating Temperature -40C to +85C (A grade)

Features

  • Gain set with single external resistor (5 to 1000)
  • 50uV typical input offset voltage
  • 1.2nA typical input bias current
  • 86dB min CMRR at G=5
  • 300uA typical supply current
  • Wide supply range: single 3.4V to 36V
  • Input protection to +/-20V beyond supplies
  • Over-temperature performance specified

Applications

  • Industrial process control
  • Medical instrumentation
  • Bridge transducer amplifiers
  • Current sensing

The AD8227ARZ-R7 from Analog Devices is a low-cost, low-power instrumentation amplifier with a single-resistor gain setting from 5 to 1000 in an SOIC-8 package. The R7 suffix indicates tape and reel packaging with 2500 units per reel. The minimum gain of 5 (compared to the AD620’s minimum gain of 1) allows the internal resistors to be optimized for lower power consumption (300uA typical supply current vs. AD620’s 1.3mA) and wider supply voltage range (single 3.4V to 36V vs. AD620’s +/-2.3V to +/-18V). The gain formula G = 5 + 80k/RG differs from the AD620’s G = 1 + 49.4k/RG, reflecting the different internal resistor values. The 50uV typical input offset voltage and 1.2nA typical input bias current provide precision performance for bridge and thermocouple applications. The 86dB minimum CMRR at G=5 is achieved through laser-trimmed internal resistors. The input structure provides overvoltage protection to +/-20V beyond the supply rails with 5kOhm external current-limiting resistors. The 9.5 nV/sqrt(Hz) input voltage noise at 1kHz is suitable for most industrial sensor applications.

The AD8227ARZ-R7 uses a three-op-amp instrumentation amplifier topology optimized for low power and wide supply range. The input stage consists of two amplifiers (A1, A2) with feedback through the internal 40kOhm resistors and the external gain resistor RG. The differential voltage across RG creates a current I = (V+IN – V-IN) / RG, which flows through the 40kOhm internal resistors, producing a preamplified differential voltage at the A1/A2 outputs. The gain is G = 5 + 80k/RG, where the minimum gain of 5 results from the internal resistor ratio when RG is infinite (open circuit). The output stage (A3) is a difference amplifier that converts the differential signal to a single-ended output. The internal thin-film resistors are laser-trimmed to achieve the 86dB minimum CMRR specification. The 300uA supply current is achieved by biasing the input and output amplifiers at lower currents than the AD620, trading bandwidth and slew rate for power savings. The input overvoltage protection uses internal ESD diodes that clamp the input voltage to the supply rails. When the input voltage exceeds the supply by more than a diode drop, current flows through the external 5kOhm resistors and the internal diodes to the supply, limiting the input current to safe levels. The wide 3.4V to 36V single-supply range allows operation from a single 5V or 24V supply without requiring a negative rail.

Pin Name Type Function
1 RG1 Input Gain resistor connection 1
2 -IN Input Inverting input (high impedance)
3 +IN Input Non-inverting input (high impedance)
4 -VS Power Negative supply (or GND for single-supply)
5 REF Input Output reference (usually GND)
6 OUTPUT Output Amplified output voltage
7 +VS Power Positive supply
8 RG2 Input Gain resistor connection 2
  • 4-20mA current loop receiver with AD8227 at G=5, 300uA Iq, and 3.4V minimum single-supply operation
  • Wheatstone bridge load cell amplifier with G=500, 50uV Vos, and 114dB CMRR for sub-millivolt signal extraction
  • Battery-powered portable thermocouple amplifier with +/-1.7V supply and 300uA current for 1000-hour operation from a coin cell
Manufacturer Part Number Package Notes
ADI AD8227BRZ-R7 SOIC-8 B grade, better offset spec
ADI AD620ARZ SOIC-8 Higher Iq, gain from 1, wider BW
TI INA333AIDR SOIC-8 Zero-drift, 350uA, lower Vos
ADI AD8422ARZ SOIC-8 Lower noise, higher precision
TI INA128UA SOIC-8 G=1-10000, similar to AD620
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Contact Information

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Service & Packaging

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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