MAX4072ATA+T

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MAX4072ATA+T Application Field and Working Principle

The MAX4072ATA+T is a CMOS, single-supply, low-power, low-cost, internally compensated instrumentation amplifier (IA). It provide optimized performance and improved dynamic range for low-cost precision data-acquisition applications, higher accuracy systems requiring a wide dynamic range and low-power applications. The device is designed for use with single supplies as low as 1.8V, and comes with four external gain settings from 1 to 1000 via resistors.

This device is part of Linear\'s - Amplifiers - Instrumentation, OP Amps, Buffer Amps family. It is specifically designed as instrumentation amplifier with low power and high precision.

Working Principle

The MAX4072ATA+T consists of three-operational amplifiers, a single supply of 1.8 V to 5.5 V, a bandwidth of 560 kHz, gains of 1 to 1000, a maximum output voltage swing of 0.2 V to VCC, a maximum voltage offset of 0.02 V, and quiescent current of less than 1.6 mA. It provides a low-cost instrumentation amplifier solution with a high degree of precision and accuracy.

The device consists of three integrated amplifiers. When a differential input voltage is applied between the two input terminals, the three amplifiers, represented by U1, U2, and U3, interact to produce an amplified output voltage with a gain that can be adjusted by external resistors connected to the OUTA, OUTB, and OFFA pins. The differential input is typically an AC signal; however, other signals such as strain gauges, thermocouples, voltage dividers, and bridges can be used as well. The device is designed to amplify and attenuate the input signal to produce an amplified output voltage.

The ON/OFF pin is used to enable or disable the device. When the ON/OFF pin is low, the device is in the disabled state. However, when the ON/OFF pin is externally driven high, the device is enabled and the output is a function of the input differential voltage. The device can be powered up with a single +VCC supply between 1.8 V and 5.5 V and the signal ground.

Performance Characteristics

The MAX4072ATA+T offers a variety of performance characteristics. The device is designed to provide a wide maximum output voltage swing of 0.2 V to VCC, a maximum voltage offset of 0.02 V, and quiescent current of less than 1.6 mA. It also features a low input bias current of 0.8 nA, a bandwidth of 560 kHz, and excellent PSRR performance of more than 90 dB.

The device offers four external gain settings of 1, 10, 100 and 1000. The gain is set by connecting external resistors to the OUTA, OUTB, and OFFA pins. For each gain setting an appropriate resistor value needs to be selected. The output swing of the device remains the same regardless of the gain setting.

Conclusion

The MAX4072ATA+T is a CMOS, single-supply, low-power, low-cost, internally compensated instrumentation amplifier (IA). It provides optimized performance and improved dynamic range for low-cost precision data-acquisition applications, higher accuracy systems requiring a wide dynamic range, and low-power applications. The device is designed for use with single supplies as low as 1.8V and comes with four external gain settings from 1 to 1000 via resistors.

The MAX4072ATA+T provides a wide maximum output voltage swing of 0.2V to VCC, a maximum voltage offset of 0.02V and quiescent current of less than 1.6mA. In addition to the low input bias current of 0.8nA, the device also features an excellent PSRR performance of more than 90dB and a bandwidth of 560kHz. The device offers four external gain settings of 1, 10, 100 and 1000, and the gain is set by connecting external resistors to the OUTA, OUTB, and OFFA pins.

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