OPA37GU

Voltage - Input Offset:	25µV
Base Part Number:	OPA37
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	8 V ~ 44 V, ±4 V ~ 22 V
Current - Output / Channel:	25mA
Current - Supply:	3.3mA
Series:	--
Current - Input Bias:	15nA
Gain Bandwidth Product:	63MHz
Slew Rate:	11.9 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	General Purpose
Part Status:	Active
Packaging:	Tube

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Introduction

The OPA37GU is a very strong and reliable instrumentation amplifier (IA) designed specifically for use in high accuracy and high impedance wideband signal processing applications. This article will discuss the application field of the OPA37GU amplifier and its working principle.

Application Field

The OPA37GU amplifier is specifically designed for applications that require a wide linear dynamic range, low noise, and high resolution. This makes it perfect for many audio, radio frequency and wideband applications. The amplifier has a wide gain range from 10 to 600, allowing extensive use in signal measurement and preamplification applications. An important feature of this amplifier is its high open loop offset voltage rejection, making it suitable for biasing, measuring, and sensor interface designs that require low drift over time.The OPA37GU amplifier is also frequently used in precision measurement and control systems, transceivers, portable medical devices, and broadcast systems. Its small size makes it a great choice for small-scale, high-accuracy applications that require wide dynamic range and high resolution.

Working Principle

The OPA37GU amplifier operates on the principle of two input and two output complementary-pair current mode differential amplifiers (CMDAs). This design allows it to remain stable and provide extremely linear operation even at high gains. In this type of amplifier, one of the inputs is inverted, while the other is noninverted. The inputs of the amplifier come from the positive and negative signals, or the bridge circuit inputs. These inputs are then combined in the amplifier’s differential amplifier and then amplified and given out from the output stage. The output stage is then regulated to maintain a linear output, even over wide gain ranges. The OPA37GU has a slew rate of 1 MHz and a bandwidth of up to 500kHz for wideband applications. Furthermore, the amplifier’s total harmonic distortion (THD) is below 0.02%, providing clean, distortion free operation.

Conclusion

The OPA37GU is a versatile and reliable instrumentation amplifier designed for use in high accuracy and high impedance wideband signal processing applications. Its features are perfectly suited to precision measurement and control systems, portable medical devices, transceivers, and broadcast systems. The amplifier operates on the principle of two input and two output complementary-pair current mode differential amplifiers, and has a slew rate of 1 MHz and a bandwidth of up to 500kHz for wideband applications. Thanks to its excellent linearity, low noise levels, and high resolution, the OPA37GU amplifier is a perfect choice for applications that require both wide linear dynamic range and high precision.

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