OPA4705UA

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The OPA4705UA is a precision, low-noise, low-offset, single-supply voltage amplifier that is commonly used for general purpose amplification and instrumentation. This component is especially well-suited for applications where low power dissipation, small size, and precision linearity are required. Due to its low-noise operation, the OPA4705UA is an ideal choice for analog signal applications such as medical instrumentation, instrument-to-line level conversion, automotive test and measurement, precision transducer amplifiers, and audio preamplifiers.

OPA4705UA Application Field and Working Principle

The OPA4705UA is a precision operational amplifier used for a wide range of applications, ranging from general purpose amplification and instrumentation to transducer amplifiers and audio preamplifiers. This device is comprised of an input stage, gain stage, output stage and a power supply connection. The OPA4705UA is a FET-input operational amplifier, meaning it operates with a low input bias current, low input offset voltage and low power supply rejection ratio.

The input stage is the part of the amplifier which amplifies the input signal, and consists of a differential input pair and a pair of bias networks. The differential input pair is composed of a p-channel FET and an n-channel FET, both of which have a low input bias current, resulting in low noise operation. The bias networks provide a controlled input bias current and also provide temperature compensation. This causes the OPA4705UA’s output to remain constant even when the temperature changes.

The gain stage is the part of the amplifier which sets its gain. The gain is set by the ratio between the value of the feedback resistor, RF, and the input stage’s output impedance, Ro. The output stage is the part of the amplifier which drives the power supply voltage, VS, and is made up of two class-AB output transistors. The power supply connection is required to supply the operating voltage for the OPA4705UA and is typically a single supply voltage of 5V.

The OPA4705UA has a slew rate of 6V/μs, a gain-bandwidth product of 8MHz, and an input-offset voltage drift of only 8μV/˚C. This makes the OPA4705UA ideal for precision applications with bandwidth requirements up to 8MHz while still maintaining excellent linearity over a wide temperature range.

The wide bandwidth and low noise make the OPA4705UA suitable for use in a variety of linear applications, such as instrumentation, buffer amplifiers, and audio preamplifiers. The OPA4705UA is also used in automotive test and measurement for applications such as load cells and strain gages, due to its low-power dissipation and high precision linearity.

Due to its high precision, low bias current and low offset voltage, the OPA4705UA is an ideal choice for medical instrumentation. Its wide range of applications, from medical instrumentation to buffer and power amplifiers, make it a versatile and reliable device for any precision linear application.

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