UA748CDT

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

The UA748CDT is an operational amplifier chip designed for a variety of linear applications within the instrumentation, operational amplifiers and buffer amplifier fields. It is a dual operational amplifier system, featuring two high gain amplifiers and a power-saving technique that enables its use in battery-powered portable instruments. This article will explain the application field and working principle of the UA748CDT.

Application Field

The application field of the UA748CDT covers three major areas: instrumentation, operational amplifiers and buffer amplifiers. Its two amplifiers, the UA748C and the UA748DT, have large current gains from low operating voltages, and feature low noise and low crosstalk. The UA748CDT can be used for a variety of applications in these three fields, such as for the measurement of temperature, pressure, voltage, and current; for buffering signals in various audio systems; and for constructing high frequency voltage amplifiers and power amplifiers.

Working Principle

The working principle of the UA748CDT is based on the circuit design of the two amplifiers. The amplifier is a differential input stage which consists of two BJT transistors and two resistors, or a single transistor and two capacitors. The transistors provide the amplification and the resistors or capacitors provide the feedback loop. The output of the amplifier is then fed to a power amplifier to boost the signal strength. The overall noise level is low because of the design of the feedback network, and the output is stable because of the low gain of the amplifiers.

The two transistors in the input stage of the UA748CDT are emitter followers, and the feedback loop consists of two capacitors or two resistors, depending on the application. The input stage amplifies the input signal, and then the amplified signal is fed to the power amplifier, where it is amplified further. The amplified signal is then fed to the output stage, where it is filtered and outputted as the desired signal. The low noise of the circuit is maintained by the low gain of the amplifiers.

Conclusion

The UA748CDT is a dual operational amplifier chip designed for use in the instrumentation, operational amplifiers and buffer amplifiers fields. It features two high gain amplifiers and a power-saving technique that enables its use in battery-powered portable instruments. The two amplifiers and the feedback loop are designed to provide low noise and low crosstalk, while the overall noise is kept low by the low gain of the amplifiers. With its versatile application field and working principle, the UA748CDT is an efficient and reliable amplifier design for a variety of linear applications.