MAX4072AUA

Current - Input Bias:	2.4µA
Base Part Number:	MAX4072
Supplier Device Package:	8-uMAX
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply, Single/Dual (±):	2.7 V ~ 24 V
Current - Supply:	100µA
Voltage - Input Offset:	80µV
Series:	--
-3db Bandwidth:	100kHz
Slew Rate:	--
Output Type:	--
Number of Circuits:	1
Amplifier Type:	Current Sense
Part Status:	Obsolete
Packaging:	Tube

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Introduction

MAX4072AUA is an operational amplifier (op-amp) specifically designed for applications in instrumentation, buffer amps, and other linear applications. The device is a CMOS (complementary metal–oxide–semiconductor) operational amplifier, with high output drive current and low offset voltage, utilize to reduce input offset voltage, save power, and improve power supply ripple rejection. This paper will discuss the field and working principle of the MAX4072AUA.

Working Principle

The MAX4072AUA comprises two internal amplifiers, one adjustable and one fixed, with the output stage of a three-stage CMOS operational amplifier. The first stage of the MAX4072AUA begins with the input stage, which is composed of two complementary MOSFETs mirroring each other. This setup provides differential input, wherein the output current of one MOSFET is equal to that of the other. The MOSFETs contribute to the amount of gain provided by the amplifier, thus the input stage has a self-amplifying feature. The open-loop gain of the MAX4072AUA unit is set to 100,000V/V, which is relatively high. The second stage of the MAX4072AUA consists of the interstage amplifier. This stage allows the control of the input stage and the matching MOSFETs themselves. The main function of the interstage is to lower the input resistance to reduce stability issues and improve the bandwidth of the circuit. Additionally, the interstage amplifier reduces power consumption and helps to cancel offset voltage. The third and final stage of the MAX4072AUA is the output stage. This stage is composed of two distinct circuits: one for positive output, and the other for negative output. This stage is fairly fast, providing a slew rate of 2.5V/μs. The output stage is also the stage in which over-voltage protection is implemented, allowing a maximum voltage at the outputs of up to 28V.

Application field

The MAX4072AUA is primarily used in instrumentation and measurement. It features an offset voltage of only 10 μV and a large open-loop gain of 100,000V/V. Its low quiescent current and wide bandwidth capability make it an ideal choice for instrumentation applications. Its low input offset voltage combined with the high input impedance make the MAX4072AUA suitable for accurate, low-noise measurements. The MAX4072AUA can be used as an operational amplifier in applications such as audio amplifiers, buffer amps, and voltage followers that require high-bandwidth, low-offset performance. It can also be used in DC bias circuits, such as motor controllers or power supplies, as a voltage reference or amplifier. The MAX4072AUA is also suitable for a variety of other applications, such as active filters, gain blocks, and transimpedance amplifiers for current sensing. Furthermore, it has the capability to be used in combination with other CMOS amplifiers or devices, forming a powerful development platform for a wide range of applications and systems.

Conclusion

The MAX4072AUA is an ideal operational amplifier for linear applications, such as instrumentation and buffer amplifier. Its low offset voltage and high open loop gain make it suitable for a wide array of applications, ranging from DC bias circuits to audio amplification. The device incorporates three distinct stages and features wide bandwidth, low offset voltage, and a slew rate of 2.5V/μs.

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