MAX4243ESD

Voltage - Input Offset:	200µV
Base Part Number:	MAX4243
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	1.8 V ~ 5.5 V, ±0.9 V ~ 2.5 V
Current - Output / Channel:	2.5mA
Current - Supply:	14µA
Series:	Beyond-the-Rails™
Current - Input Bias:	2nA
Gain Bandwidth Product:	90kHz
Slew Rate:	0.04 V/µs
Output Type:	Rail-to-Rail
Number of Circuits:	2
Amplifier Type:	General Purpose
Part Status:	Active
Packaging:	Tube

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The MAX4243ESD is a precision dual-channel programmable instrumentation amplifier (IA), used for amplifying small signals in the presence of large common-mode voltages and large common-mode transients. It is used in many applications from data acquisition, biomedical, industrial automation and motion control. The MAX4243ESD can be configured through the GUI COM port or single-wire UART commands, allowing users to program gains, adjust channel specifications, and set other parameters related to operation.

Introduction

The MAX4243ESD\'s unique advantage over other conventional IAs is its precision, range, and integrated safety features for a wide variety of systems. With the ability to adjust gain from 0.1 to 10,000 in 0.01 dB steps and programmable common-mode offset from -1.5 to +1.5 V, the MAX4243ESD is designed to provide exceptional immunity against common-mode noise and transients. The MAX4243ESD also features a single power supply, only drawing 6 mA of quiescent current and enables customization of its channel configuration.

Application Field

The Precision Dual-Channel Programmable Instrumentation Amplifier (IA) has many applications, the most popular being in data acquisition, biomedical engineering, motion control, industrial automation, and digital signal processors. These applications use the MAX4243ESD to improve signal-to-noise ratios, reduce electrical noise, and increase accuracy. While traditional IAs are limited due to their single-supply output voltage range and lack of programmability, the MAX4243ESD helps to overcome these limitations with its wide input range, adjustable gain, and adjustable offset.

Working Principle

The MAX4243ESD consists of two identical IAs with a differential input stage, an adjustable gain stage, and an adjustable offset stage. The gain is adjusted with an external resistor, and the offset is adjusted with an external voltage. The output of each IA is fed into a unity-gain buffer amplifier that has a low output impedance and can drive large capacitive loads or capacitively coupled signals. As the differential input is fed into each IA, the output stage is then fed into the unity-gain buffer amplifier. This buffers the output of each IA and reduces the output impedance to reduce unwanted noise.

Conclusion

The MAX4243ESD is a precision dual-channel programmable instrumentation amplifier. Its design ameliorates the common problems associated with other traditional IAs by equipping it with adjustable gain and adjustable offset stages. By programming and configuring the MAX4243ESD according to specific system requirements, it can be used for many applications and provide for increased accuracy and precision of signal amplification.

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