LT1125CSW#TRPBF

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LT1125CSW#TRPBF is a precision operational amplifier made by Linear Technology. It is designed particularly for instrumentation and data acquisition systems. The amplifier is designed to accurately measure and convert signals, such as voltages, between two or more points. It is a high-precision, low-noise, CMOS instrumentation amplifier, with an input current noise of 0.6 pA/√Hz and a low-offset error of 0.5 μV max.

Application Field

The LT1125CSW#TRPBF is a versatile amplifier suitable for a wide range of instrumentation applications, such as a wide dynamic range signal conditioning, precision data acquisition systems, active filters and precision audio performance.

In medical application, the LT1125CSW#TRPBF is ideal for measuring ECG signals as well as temperature, pH levels and other biometric measurements. It is also used in industrial application as it provides a low-noise and low-offset performance for harsh environments and is fully specified over a wide temperature range from -40°C to 85°C.

In automotive applications, the amplifier is commonly used for the measurement and control of engine parameters such as temperature, pressure or speed. It is also used for fuel injection systems, stereo systems and absolute position transducers.

Working Principle

The LT1125CSW#TRPBF is a fully differential instrumentation amplifier. It consists of two input transistors, one P-channel and one N-channel MOSFET, with drain to source voltages of 12 V and -12 V, respectively. The two transistors are connected such that the voltage difference between their drain and source is the same. This voltage difference is called the differential gain, which is typically 110 dB.

The P-channel MOSFET operates in enhancement mode, while the N-channel MOSFET operates in depletion mode. Consequently, when a signal is applied to the amplifier, current flows through the P-channel transistor and the N-channel transistor. The P-channel transistor operates as an inverting amplifier, while the N-channel transistor operates as a non-inverting amplifier. This configuration allows for the amplification of an input signal or the generation of an output signal. The gain of the amplifier is then determined by the ratio of the P-channel MOSFET drain and source resistors.

The LT1125CSW#TRPBF is a low-power instrumentation amplifier, with a quiescent current of only 2.5 mA. It features an output slew rate of 14 V/μs and a low 1/f corner frequency of 1kHz. The amplifier gain is constant over the full frequency range, with a gain flatness of 0.1 dB and a total harmonic distortion of 0.002%.

The LT1125CSW#TRPBF operates from a single +10V power supply, with no need for a negative supply, and is fully specified over a wide temperature range from -40°C to 85°C. The device also offers a very good power supply rejection ratio (PSRR) of 76 dB, and a very good common mode rejection ratio (CMRR) of 78 dB.

In summary, the LT1125CSW#TRPBF is a precision operational amplifier designed for instrumentation, data acquisition and control applications. Its low-noise, low-offset performance and wide temperature range make it ideal for applications required in the medical, industrial and automotive industries.

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