OPA137N/250

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OPA137N/250 Application Field and Working Principle

OPA137N/250 is a high voltage, high-current, low-noise instrumentation amplifier integrated circuit (IC) with a rail-to-rail output using a conventional op-amp architecture. It is a versatile, low-cost and reliable solution for instrumentation and data acquisition applications that require a sensor output of up to 1mV, a low input bias current, and high gain accuracy & stability.

Such integrated circuits offer significant advantages over discrete amplifiers, as they require less board space and fewer components, resulting in cost savings. OPA137N/250 is a single package that is available in 3-pin TO-99, 8-pin PDIP, and SOIC formats. It can also be configured as a low-voltage amplifier.

Application Fields

The main application fields of OPA137N/250 are data acquisition systems, medical and industrial control systems, consumer audio systems, and robotics. The device can be used to condition small signals such as temperature sensors, motion sensors, and electromagnetic pick-up circuits. It can also measure extremely small mechanical or acoustic signals, or voltage induced by current or magnetic fields. Furthermore, the device can be employed to amplify the output signal of Hall effect sensors or Wheatstone Bridges.

Working Principle

The OPA137N/250 is based on the well-established non-inverting amplifier circuit. It has two stable and complementary inputs, a noninverting input and an inverting input. The two input signals are compared to a reference voltage (usually ground). The outputs of both transistors, one PNP and one NPN, are connected to the output buffer, resulting in a differential output voltage. The differential output is then amplified and buffered by an op-amp.

The amplifier has a gain of up to 250. Its low noise, low input bias current, high gain accuracy, and rail-to-rail output make it an ideal solution for the acquisition of low-level signals. Furthermore, the amplifier has a wide common-mode input range, making it suitable for applications such as measuring small strain gauge signals or output of medical sensors.

In applications involving small signals, the OPA137N/250 can be employed to condition the signal before it is passed on to analog-to-digital converters (ADCs) or data acquisition cards. This allows the signal to be accurately and precisely measured and transmitted to its destination. As the voltage output range of the device is wide, it can also be used to amplify larger signals, such as that produced by a microphone or an electric guitar.

Conclusion

The OPA137N/250 is a versatile instrumentation amplifier integrated circuit (IC) with a rail-to-rail output. Its main application fields are data acquisition systems, medical and industrial control systems, consumer audio systems, and robotics. The device has two inputs, a non-inverting input and an inverting input. The two inputs are compared to a reference voltage and their output is then amplified and buffered by an op-amp. The amplifier can be used to condition small signals, such as temperature sensors and motion sensors, as well as larger signals, such as those produced by a microphone or electric guitar.

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