LME49710NA/NOPB

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LME49710NA/NOPB amplifiers are top of the line general-purpose instrumentation amplifiers, suitable for a wide range of applications. Their ability to amplify a small difference between two voltage signals while rejecting interference makes them particularly useful in sensitive medical and laboratory measurements. In this article, we will discuss LME49710NA/NOPB application fields and working principle.

Application Fields

LME49710NA/NOPB amplifiers are used in a variety of always-on applications such as data acquisition and monitoring in hospitals, laboratories, and research facilities. They are uniquely suited for high-sensitivity and low-noise applications, such as electrophysiological measurements and sensitive transducer applications. Additionally, they are used for ultrasonic detection, precision gain stages, and analog-to-digital converter (ADC) buffers.

Some of the most common applications for the LME49710NA/NOPB amplifiers are ECG, EEG, EKG, cardiology, pressure transducers, respiratory monitoring, weight scales, pH meters, oxygen sensors, and accelerometers.

Working Principle

The primary working principle of the LME49710NA/NOPB amplifiers is to amplify the small differences between two voltage signals while rejecting interference on one or more of them. This is achieved by amplifying the difference between the two signals and rejecting interference on either one or all of them. In this way, a clean and readable signal is obtained that is uninterrupted by interference.

The LME49710NA/NOPB amplifiers use an input stage consisting of two current-sensing transistors to provide an input voltage offset of around ±250 mV. This novel design allows for a wide bandwidth with a low output noise level. Additionally, the amplifier has an input bias current error of around ±10 pAp-p and an output common-mode voltage range of up to +28 V.

The LME49710NA/NOPB amplifier is then followed by an intermediate gain stage, which receives the input signal and amplifies it to a gain of up to +1000 and the +/-1 dB open-loop bandwidth is up to 550 kHz. The output stage of the amplifier is a push-pull output stage, meaning it can accept and amplify signals with a large amplitude.

The LME49710NA/NOPB amplifier also has a low power consumption, making it suitable for battery-powered applications. It consumes only 40 mW of power and has an input referred noise level of only 5 nV√Hz. This makes it an excellent choice for low-noise electronic systems.

Conclusion

The Texas Instruments LME49710NA/NOPB is a top-of-the-line instrumentation amplifier, particularly suitable for sensitive medical and laboratory measurements. Its ability to amplify the small differences between two signals and reject interference makes it a favorite choice for ECG, EEG, EKG, and other always-on applications. Additionally, its low power consumption and high bandwidth make it suitable for a variety of other applications as well.

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