PGA207UA

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The PGA207UA is a monolithic single channel instrumentation amplifier featuring high common-mode rejection and self-test capability. It is suitable for applications that are sensitive and fast, where noise and distortion can be a problem. It is a very useful amplifier for precision measurement applications, such as thermocouples, strain gauges, force transducers, and other instruments requiring low-noise analog signal conditioning.

Features

• Low-noise performance
• High common-mode rejection, 85 dB typical at 1 kHz
• Distortion-free auto-zero
• Low power dissipation, 1 mW typical
• High power output current, 200 mA
• Built-in offset calibration and adjustable feedback
• Low input bias and offset voltage

Applications

• Electrochemical activity measurement
• Thermocouple, micro-power devices and strain gauge signal conditioning
• Medical instrumentation
• Biomedical research
• Precision voltage reference sources
• Precision level shifters
• Low power sensor load cells
• Photodiode and optical sensor measurements
• Voltage-to-current and current-to-voltage conversion circuits

Working Principle

The working principle of the PGA207UA is based on the classic instrumentation amplifier topology, with a difference amplifier providing the basic gain, followed by a feedback loop that applies gain correction to the output to compensate for gain errors due to component tolerances. The input terminals of the PGA207UA are connected to a differential amplifier which is used to amplify the difference between its two inputs. The output of the differential amplifier is then connected to a feedback loop. This feedback loop uses amplifiers and resistors to adjust the output of the instrumentation amplifier to minimize its gain error.

The PGA207UA has an additional feature which is referred to as Self-Test. This feature is implemented by use of a special DC current source, which is connected to the inverting input of the differential amplifier. The Self-Test feature allows the user to adjust the gain of the amplifier to compensate for any gain errors which may be caused by component tolerances. The Self-Test feature also allows the user to check the output of the amplifier for any non-ideal responses, such as low-frequency instabilities.

Conclusion

The PGA207UA is a high performance monolithic single channel instrumentation amplifier with excellent noise and distortion performance. It offers high common-mode rejection and self-test capability, making it suitable for precision low-noise analog signal conditioning applications, such as thermocouples, strain gauges and force transducers. The amplifier offers superior common-mode rejection and low power dissipation, while its self-test feature adds further flexibility. The PGA207UA is an ideal choice for applications where low-noise and precise measurement is necessary.

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