MAX4378FASD+

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MAX4378FASD+ Application Field and Working Principle

The MAX4378FASD+ is an Advanced low-noise, low-offset, CMOS, rail-to-rail input and output Instrumentation amplifier designed to support precision applications. It is an ideal solution for signal conditioning applications when used to amplify input signals of a few micro-volts, making it ideal for applications such as industrial and medical instrumentation, isolators, automotive test systems, low-level barcode readers, and biochemical sensors.

Features:

• Rail-to-Rail Input and Output
• 0.8 nV/rtHz Input Noise at 1kHz
• User Programmable Gain and Offset Adjustment
• CMOS Operational Amplifiers and Drivers
• Low 0.2mV Maximum Offset Voltage at Room Temperature
• Low Power Consumption - 2.7mA Current Draw at +5V

Design Benefits:

• Low Noise Input
• Ideal for Amplification of Small Signals
• Programmable Gain and Offset
• Rail-to-Rail Design Enables Measurement of BothExtremely Small and Large Signals
• Low Power Consumption

Application Examples:

• Industrial and Medical Instrumentation
• Isolators
• Automotive Test Systems
• Low-level Barcode Readers
• Biochemical Sensors

Working Principle:

The working principle of the MAX4378FASD+ is based on an Instrumentation amplifier architecture.The MAX4378FASD+ contains two low-noise, high-input impedance op amps and a precision amplifierarranged in a differential input, single-ended output configuration. The two input op amps havevery high input impedances, low input bias currents and low offset voltages, making them ideal foramplifying small signals. The third amplifier is used to buffer and amplify the input signal andalso to provide rail-to-rail output swing. The user can adjust both the gain and the offset ofthe amplifier with a single external resistor.

The input signals are applied to the two input op amps. The amplifier is designed to achieve aninput common-mode voltage range from 0.2V below the negative supply to the positive supply.The two input op amps act as a differential amplifier, with the difference between their outputsbeing amplified by the third op amp. This fourth op amp buffers the output signal and provides aguaranteed rail-to-rail output swing. The user can adjust both the gain and the offset of theamplifier with a single external resistor.

Conclusion:

The MAX4378FASD+ is a low-noise, low-offset, CMOS, rail-to-rail input and output instrumentation amplifier that is ideal for signal conditioning applications involving amplification of small signals, including industrial and medical instrumentation, isolators, automotive test systems, low-level barcode readers, and biochemical sensors. It features an input common-mode voltage range from 0.2V below the negative supply to the positive supply, low input bias currents and low offset voltages, and user programmable gain and offset adjustment with a single external resistor.

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