LMV821M5X/NOPB

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The LMV821M5X/NOPB from Texas Instruments is an instrumentation amplifier with low-noise and high CMRR feature. It is specifically developed for high-performance, precision measurement applications. It is a single Operational Amplifier (Op-Amp) with outstanding common-mode rejection, low-input offset voltage, high-bandwidth, and low-noise performance of 2.0nV/√Hz.

The LMV821M5X/NOPB has high common-mode rejection (CMRR) of 85 dB, wide common-mode input voltage range of up to ±36V, and an offset voltage of 1.5mV. It also features a high open-loop gain of 125dB, low offset voltage of 10µV/°C, an input bias current of 0.2nA, and an output-voltage swing of 9V. It supports a high-frequency response up to 1.5MHz, and can withstand ambient temperatures up to +125°C.

The LMV821M5X/NOPB is offered in the tiny ThinSOT-8 and SC-70 packages and is available in two grades: "M4X" for commercial applications and "M5X" for higher precision applications. It is RoHS compliant, hot pluggable, and surge tolerant.

Application Field

The LMV821M5X/NOPB is widely used in medical applications such as medical imaging, anesthesia monitoring and monitoring of vital signs, as well as digital weighing scales, programmable logic controllers, gas and liquid flow meters, accelerometers, and digital-pressure gauges. It can also be used in precision data conversion in amplifiers, analog-to-digital and digital-to-analog converters, and Current Loop Transmitters. The LMV821M5X/NOPB is often used in test or measurement environments due to its low offset voltage, excellent common-mode rejection and temperature stability.

Working Principle

The LMV821M5X/NOPB combines the precision and stability of an instrumentation amplifier with the high-speed low-noise performance of an operational amplifier (Op-Amp). It is a dual-input single-output amplifier featuring two cascaded series-connected Op-Amp stages (A1, A2). An external voltage reference is applied to the non-inverting inputs of the two Op-Amps (A1 and A2). Product inputs are supplied to the non-inverting input of A1, and the output of A1 is connected to the inverting input of A2.

The gain of the amplifier is determined by the ratio of the resistors connected to A1 and A2. A resistor network is used to provide isolation and a low output impedance. The gain of the amplifier is set externally and is independent of the supply voltage. The input voltage reaches the non-inverting input of A1 and passes through the resistor R1 (its resistance is R1/R2+R1) and the differential amplifier A1. The output voltage of A1 is then fed to the inverting input of A2, which amplifies it by the same gain and sends it to the output. Because the inputs of A1 and A2 are supplied with the same voltage, the common-mode voltage is rejected, ensuring a large CMRR.

Conclusion

The LMV821M5X/NOPB from Texas Instruments is an instrumentation amplifier with excellent common-mode rejection, low-input offset voltage, high-bandwidth, and low-noise performance. It is designed for high-precision measurement applications, and is suitable for medical applications such as medical imaging, digital weighing scales, and programmable logic controllers. The LMV821M5X/NOPB is a dual-input single-output amplifier featuring two cascaded series-connected Op-Amp stages, with its gain set externally and independently of the supply voltage. This ensures excellent CMRR and a low output impedance.

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