MAX4377HAUA+T

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Amplifier Type:	Current Sense
Number of Circuits:	2
Output Type:	--
Slew Rate:	10 V/µs
-3db Bandwidth:	1.2MHz
Current - Input Bias:	800µA
Current - Supply:	1mA
Voltage - Supply, Single/Dual (±):	3 V ~ 28 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package:	8-uMAX
Base Part Number:	MAX4377

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Introduction

The MAX4377HAUA+T is an ultra-low power instrumentation amplifier with rail-to-rail inputs and a wide input range. It is designed to accommodate a wide range of sensor and amplifier applications, including temperature and pressure sensing, instrumentation and control, analog water level sensing and condenser microphone amplifiers. It operates from a single supply voltage up to 18 V and is capable of driving load currents up to 100 mA. The MAX4377HAUA+T is ideal for portable and low power instrumentation applications and is available in a lead-free, chip-scale package (CSP).

Application Field

The MAX4377HAUA+T is suitable for a wide range of sensor and amplifier applications. It is suitable for ambient temperature sensing, temperature and pressure sensing, water level sensing, and condenser microphone amplifiers. It offers a very high input impedance of 96 dB, making it ideal for use with low current, low impedance input signals. The MAX4377HAUA+T also provides a high CMRR of 90 dB, which is useful when working with differential signals, and its excellent gain bandwidth product makes it suitable for power amplifier applications.In addition, the MAX4377HAUA+T is designed with rail-to-rail inputs, allowing it to accept both positive and negative signals. This makes it useful for converting signals from high impedance sources such as electret microphones, which typically have a relatively large open-circuit voltage. The MAX4377HAUA+T also has a low offset of 0.7 mV, which is ideal for accurate sensor applications.

Working Principle

The MAX4377HAUA+T Instrumentation Amplifier is a three-stage design that provides a high CMRR of up to 90 dB, an input-referred noise of 4.8 nV/√Hz and a wide operating bandwidth from 0.1 Hz to 300 kHz. The first stage is an inverting op amp, which amplifies the input signal by an adjustable gain factor, selected by adjusting the external resistance connected to the gain adjust pin. The output of the inverting amplifier is then fed to the second stage, where it is added to a reference voltage to shift the output voltage to the desired level. The output of the addition circuit is then sent to the third stage - a high-gain follower - which provides rail-to-rail output capability.The MAX4377HAUA+T is capable of driving loads of up to 100 mA and is designed to operate over a supply voltage range of 4.5 V to 18 V. It is also designed to minimize power dissipation, with a low quiescent current of 10 μA. In summary, the MAX4377HAUA+T Instrumentation Amplifier is an ultra-low power instrumentation amplifier for applications such as temperature and pressure sensing, instrumentation and control, analog water level sensing and condenser microphone amplifiers. With an excellent CMRR of up to 90 dB, an input-referred noise of 4.8 nV/√Hz, and a wide operating bandwidth of 0.1 Hz to 300 kHz, the MAX4377HAUA+T is suitable for a wide range of low-power, low-noise sensor and amplifier applications.

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