Instrumentation Amplifiers

Instrumentation amplifiers (sometimes shortened to In-Amps) are a type of precision gain block used in electronic and measurement test equipment. Instrumentation amplifiers act as a differential amplifier; a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage signals that are common to the two inputs. RS Components offer a range of instrumentation amplifiers from several trusted brands in the industry, including Analog Devices, Microchip, Texas Instruments, and more.

How do instrumentation amplifiers work?

Instrumentation amplifiers are almost always composed of 3 op-amps (operational amplifiers) and several resistors. They provide the most important function of CMR (common-mode rejection) by cancelling out any signals that have the same potential as received by both of the inputs. Any signals that have different potentials get amplified. They are used for low frequency signals (such as <1MHz), which they amplify whilst also cutting out any common-mode noise that may be present in the input signal.

What are the instrumentation amplifiers used for?

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. 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.

Typical applications

  • Test & Measurement Industrial Devices
  • Data Acquisition Devices
  • Medical Devices

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Description Prix 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
N° de stock RS 189-7744
Référence fabricantMAX31855JASA+
3,786 €
Each (In a Tube of 100)
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -40 °C +750 °C - - - 1500 μA
N° de stock RS 189-8832
Référence fabricantMAX4208AUA+
2,194 €
Each (In a Pack of 5)
Unité
Dual, Single μMAX Surface Mount 2.85 → 5.5 V 8 ±1.425 to ±2.75V Rail to Rail Output 0.02mV -40 °C +125 °C 2GΩ 106dB 750kHz 3 mA
N° de stock RS 189-7745
Référence fabricantMAX31855KASA+
3,851 €
Each (In a Tube of 100)
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
N° de stock RS 732-8406
Référence fabricantMAX4208AUA+
2,18 €
Each
Unité
Dual, Single μMAX Surface Mount 2.85 → 5.5 V 8 ±1.425 → ±2.75V Rail to Rail Output 0.02mV -40 °C +125 °C 2GΩ 106dB 750kHz 3 mA
N° de stock RS 189-7288
Référence fabricantMAX4208AUA+
2,208 €
Each (In a Tube of 50)
Unité
Dual, Single μMAX Surface Mount 2.85 → 5.5 V 8 ±1.425 to ±2.75V Rail to Rail Output 0.02mV -40 °C +125 °C 2GΩ 106dB 750kHz 3 mA
N° de stock RS 783-3882
Référence fabricantMAX31855NASA+
5,35 €
Each
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1300 °C - - - 1500 μA
N° de stock RS 189-8812
Référence fabricantMAX4194ESA+
3,338 €
Each (In a Pack of 5)
Unité
Dual, Single SOIC Surface Mount 2.7 → 7.5 V 8 ±1.35 to ±3.75V Rail to Rail Output 0.69mV -40 °C +85 °C 1GΩ 60dB 250kHz 0.00002 mA
N° de stock RS 189-7761
Référence fabricantMAX6675ISA+
7,217 €
Each (In a Tube of 100)
Unité
Single SOIC Surface Mount 3 → 5.5 V 8 - No - -20 °C +85 °C - - - 1.5 mA
N° de stock RS 190-1414
Référence fabricantMAX31855KASA+
5,395 €
Each (In a Pack of 2)
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
N° de stock RS 165-9393
Référence fabricantMAX31855RASA+
4,827 €
Each (In a Tube of 10)
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -50 °C +1770 °C - - - 1500 μA
N° de stock RS 783-3891
Référence fabricantMAX31855RASA+
5,64 €
Each
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -50 °C +1770 °C - - - 1500 μA
N° de stock RS 192-3172
Référence fabricantMAX31855RASA+
5,25 €
Each (In a Pack of 2)
Unité
Single SOIC Surface Mount 3.3 V 8 - - - -50 °C +1770 °C - - - 1500 μA
N° de stock RS 165-9306
Référence fabricantMAX4194ESA+
2,295 €
Each (In a Tube of 100)
Unité
Dual, Single SOIC Surface Mount 2.7 → 7.5 V 8 ±1.35 → ±3.75V Rail to Rail Output 0.69mV -40 °C +85 °C 1GΩ 60dB 250kHz 0.00002 mA
N° de stock RS 189-7286
Référence fabricantMAX4194ESA+
2,448 €
Each (In a Tube of 100)
Unité
Dual, Single SOIC Surface Mount 2.7 → 7.5 V 8 ±1.35 to ±3.75V Rail to Rail Output 0.69mV -40 °C +85 °C 1GΩ 60dB 250kHz 0.00002 mA
N° de stock RS 146-1066
Référence fabricantMAX31855NASA+
4,827 €
Each (In a Tube of 10)
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1300 °C - - - 1500 μA
N° de stock RS 190-1258
Référence fabricantMAX31855JASA+
5,30 €
Each (In a Pack of 2)
Unité
Single SOIC Surface Mount 3.3 V 8 - No - -40 °C +750 °C - - - 1500 μA
N° de stock RS 190-1281
Référence fabricantMAX6675ISA+
8,70 €
Each
Unité
Single SOIC Surface Mount 3 → 5.5 V 8 - No - -20 °C +85 °C - - - 1.5 mA