PGA205AUG4

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The PGA205AUG4 is an instrumentation amplifier with low-noise, low-distortion, and low cost. It provides a full-featured, voltage-controlled gain amplifier for demanding applications. This amplifier operates on power supply ranging from a single +5 V to dual ±10 V sources, and features wide-bandwidth, low-noise, and low-distortion performance combined with high-gain precision..

Application Field

The PGA205AUG4 is specifically designed for applications such as audio signal processing, medical imaging, and instrumentation systems. It has a wide range of adjustable gain (1 to 100) and operates on a single or dual supply voltages, making it perfect for equipment measuring or analyzing high-impedance, low-noise signals. The low-noise, low-distortion, and low-cost design of the PGA205AUG4 makes it ideal for use in general-purpose analog signal processing.

Working Principle

The PGA205AUG4 uses a two-stage operational amplifiers (Op-Amps) to achieve its amplified gain. The first Op-Amp is an instrumentation amplifier and provides the necessary high-gain with good common-mode rejection. The second Op-Amp is a buffer amplifier, which is used to further amplify and buffer the signal from the first Op-Amp. The gain of the instrumentation amplifier is adjustable from 0 dB to 100 dB, and the gain of the buffer amplifier is adjustable from 0 dB to −40 dB, allowing for a wide range of amplifications and gain settings.

The low gain of the second Op-Amp also allows for a decrease in the total gain of the PGA205AUG4 when higher gains are not needed. The instrumentation amplifier also has a low distortion, and there is virtually no phase shift between the input and output signals due to its high common-mode rejection.

The PGA205AUG4 also has a wide common-mode operating range, which extends to the negative rail on the supply, allowing it to operate in single-ended and differential circuit topologies. In addition, a channel match offset feature and a power-up/down control provide additional versatility.

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