Instrumentation Amplifiers

Instrumentation amplifiers are a type of precision gain block, a differential amplifier (a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage common to the two inputs). Instrumentation Amplifiers are also known as in-amps.

Common applications are:

• Test & Measurement Industrial Devices
• Data Acquisition Devices
• Medical Devices
• Any noisy environment where large common-mode signals are present

How do instrumentation amplifiers work?

An instrumentation amplifier measures small signals in a noisy environment. The noise generally is "common-mode noise" (the difference between the noise-free common mode voltage and the actual common mode voltage). An instrumentation amplifier uses its common-mode rejection to distinguish the noise from the signal of interest.

What are the instrumentation amplifiers used for?

Instrumentation amplifiers are needed in nearly every field of electronics, particularly in the test and measurement industry. They can be used as a voltage follower, selective inversion circuit, a current-to-voltage converter, active rectifier, integrator, a variety of filters, and a voltage comparator.

Unlike instrumentation amplifiers (In Amp), operational amplifiers (Op Amp) are high-gain voltage amplifying devices with a differential input.

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Description Price Power Supply Type Package Type Mounting Type Typical Single Supply Voltage Pin Count Typical Dual Supply Voltage Rail to Rail Maximum Input Offset Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Input Resistance Minimum CMRR Typical Gain Bandwidth Product Maximum Supply Current
RS Stock No. 111-2200
Mfr. Part No.AD623ANZ
£3.695
Each (In a Tube of 50)
Units
Dual, Single PDIP Through Hole 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.2mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 523-8575
Mfr. Part No.AD623ANZ
£4.84
Each
Units
Dual, Single PDIP Through Hole 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.2mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 786-1017
Mfr. Part No.MAX31855KASA+
£5.05
Each
Units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
RS Stock No. 165-9491
Mfr. Part No.MAX31855KASA+
£3.989
Each (In a Tube of 100)
Units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
RS Stock No. 522-9717
Mfr. Part No.AD620ANZ
£9.04
Each
Units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 1MHz -
RS Stock No. 111-1132
Mfr. Part No.AD620ANZ
£7.419
Each (In a Tube of 50)
Units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V - 0.125mV -40 °C +85 °C 10GΩ 73dB 1MHz -
RS Stock No. 301-779
Mfr. Part No.AD595AQ
£16.35
Each
Units
Dual, Single CDIP Through Hole 5 V 14 ±15V No - -55 °C +125 °C - - 15kHz -
RS Stock No. 106-6379
Mfr. Part No.AD595AQ
£14.504
Each (In a Tube of 25)
Units
Dual, Single CDIP Through Hole 5 V 14 ±15V - - -55 °C +125 °C - - 15kHz -
RS Stock No. 913-0009
Mfr. Part No.AD8421BRZ
£6.987
Each (In a Tube of 98)
Units
Dual, Single SOIC Surface Mount 5 → 36 V 8 ±2.5 → ±18V Rail to Rail Input 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 796-8877
Mfr. Part No.AD8421BRZ
£8.78
Each
Units
Dual, Single SOIC Surface Mount 5 → 36 V 8 ±2.5 → ±18V No 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 252-1616
Mfr. Part No.INA126PA
£2.53
Each
Units
Dual PDIP Through Hole 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 759-0080
Mfr. Part No.AD8495ARMZ
£4.66
Each
Units
Dual, Single MSOP Surface Mount 2.7 → 36 V 8 ±2.7 → ±18V Rail to Rail Output - -40 °C +125 °C 60kΩ - 25kHz 0.25 mA
RS Stock No. 121-6694
Mfr. Part No.AD8495ARMZ
£3.714
Each (In a Tube of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 912-9917
Mfr. Part No.AD8429ARZ
£5.165
Each (In a Tube of 98)
Units
Dual SOIC Surface Mount - 8 ±4 → ±18V No 150µV -40 °C +125 °C 1.5GΩ 134dB 15MHz 7 mA
RS Stock No. 764-8747
Mfr. Part No.AD8429ARZ
£6.49
Each
Units
Dual SOIC Surface Mount - 8 ±4 → ±18V No 150µV -40 °C +125 °C 1.5GΩ 134dB 15MHz 7 mA
RS Stock No. 252-1593
Mfr. Part No.INA125PA
£5.16
Each
Units
Dual, Single PDIP Through Hole 5 V 16 ±15V No 0.5mV -55 °C +125 °C 100GΩ 72dB - -
RS Stock No. 169-8737
Mfr. Part No.AD595CQ
£24.35
Each
Units
Dual, Single CDIP Through Hole 5 V 14 ±15V No - -55 °C +125 °C - - 15kHz -
RS Stock No. 106-7014
Mfr. Part No.AD595CQ
£21.599
Each (In a Tube of 25)
Units
Dual, Single CDIP Through Hole 5 V 14 ±15V - - -55 °C +125 °C - - 15kHz -
RS Stock No. 923-2360
Mfr. Part No.INA114AP
£7.762
Each (In a Tube of 50)
Units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V - 125µV -40 °C +85 °C 10GΩ 110dB 1MHz 3 mA
RS Stock No. 311-524
Mfr. Part No.INA114AP
£9.27
Each
Units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 125µV -40 °C +85 °C 10GΩ 110dB 1MHz 3 mA
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The Instrumentation Amplifier ICs amplify the difference between two input signal voltages, while rejecting any signals that are common to both inputs. The DC precision and gain accuracy is maintained within a noisy environment, and also where large common-mode signals (AC power line frequency) are present.