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. 759-2578
Mfr. Part No.AD8497ARMZ
£4.39
Each
Units
Dual, Single MSOP Surface Mount 2.7 → 36 V 8 ±2.7 → ±18V Rail to Rail Output - -40 °C +125 °C - - 25kHz 0.25 mA
RS Stock No. 523-0212
Mfr. Part No.AD620ARZ
£6.41
Each
Units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 120kHz -
RS Stock No. 786-3148
Mfr. Part No.AD8422BRMZ
£6.08
Each
Units
Dual MSOP Surface Mount - 8 ±1.8 → ±18V Rail to Rail Output 50µV -40 °C +85 °C - 150dB 2.2MHz 30 μA
RS Stock No. 100-3831
Mfr. Part No.INA155UA
£2.089
Each (In a Tube of 75)
Units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Output 1mV -65 °C +150 °C 10000GΩ 80dB - -
RS Stock No. 378-2812
Mfr. Part No.INA155UA
£2.41
Each
Units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Output 1mV -65 °C +150 °C 10000GΩ 80dB - -
RS Stock No. 912-7381
Mfr. Part No.AD620ARZ
£5.106
Each (In a Tube of 98)
Units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 120kHz -
RS Stock No. 159-9272
Mfr. Part No.AD8422BRMZ
£4.841
Each (In a Tube of 50)
Units
Dual MSOP Surface Mount - 8 ±1.8 → ±18V Rail to Rail Output 50µV -40 °C +85 °C - 150dB 2.2MHz 30 μA
RS Stock No. 121-6903
Mfr. Part No.AD8421ARZ
£3.92
Each (In a Tube of 98)
Units
Dual, Single SOIC Surface Mount 5 → 36 V 8 ±2.5 → ±18V - 135µV -40 °C +85 °C 2kΩ 80dB 10MHz 2.3 mA
RS Stock No. 806-7981
Mfr. Part No.AD8421ARZ
£5.30
Each
Units
Dual, Single SOIC Surface Mount 5 → 36 V 8 ±2.5 → ±18V - 135µV -40 °C +85 °C 2kΩ 80dB 10MHz 2.3 mA
RS Stock No. 218-8427
Mfr. Part No.INA128P
£8.69
Each
Units
Dual PDIP Through Hole - 8 ±18V No 50µV -40 °C +85 °C 100GΩ 80dB 1.3MHz -
RS Stock No. 806-5522
Mfr. Part No.AD623ARZ
£3.865
Each (In a Pack of 2)
Units
Dual, Single SOIC Surface Mount 3 → 12 V 8 ±2.5 → ±6V Rail to Rail Output 200µV -40 °C +85 °C - 90dB 800kHz 500 μA
RS Stock No. 912-8135
Mfr. Part No.AD623ARZ
£2.47
Each (In a Tube of 98)
Units
Dual, Single SOIC Surface Mount 3 → 12 V 8 ±2.5 → ±6V Rail to Rail Output 200µV -40 °C +85 °C - 90dB 800kHz 500 μA
RS Stock No. 100-0773
Mfr. Part No.INA118U
£8.682
Each (In a Tube of 75)
Units
Dual SOIC Surface Mount - 8 ±15V - 125µV -40 °C +125 °C 10GΩ 73dB 800kHz 0.385 mA
RS Stock No. 231-5512
Mfr. Part No.INA118U
£10.49
Each
Units
Dual SOIC Surface Mount - 8 ±15V No 125µV -40 °C +125 °C 10GΩ 73dB 800kHz 0.385 mA
RS Stock No. 111-1154
Mfr. Part No.AD8221ARMZ
£3.293
Each (In a Tube of 50)
Units
Dual, Single LFCSP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 2.7mV -40 °C +125 °C 0.8MΩ 62dB - -
RS Stock No. 230-646
Mfr. Part No.AD597ARZ
£5.49
Each
Units
Single SOIC Surface Mount 5 → 30 V 8 - No - -55 °C +125 °C - - 15kHz -
RS Stock No. 523-7572
Mfr. Part No.AD620BRZ
£9.73
Each
Units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.05mV -40 °C +85 °C 10GΩ 80dB 120kHz -
RS Stock No. 523-6412
Mfr. Part No.AD8221ARMZ
£4.46
Each
Units
Dual, Single LFCSP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 2.7mV -40 °C +125 °C 0.8MΩ 62dB - -
RS Stock No. 912-7069
Mfr. Part No.AD597ARZ
£4.371
Each (In a Tube of 98)
Units
Single SOIC Surface Mount 5 → 30 V 8 - No - -55 °C +125 °C - - 15kHz -
RS Stock No. 111-1176
Mfr. Part No.AD620BRZ
£7.703
Each (In a Tube of 98)
Units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V - 0.05mV -40 °C +85 °C 10GΩ 80dB 120kHz -
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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.