Based on Maxim MAX40242 low noise dual op amp solution
In order to get a complete solution, it is necessary to have a clear understanding of the main electronic components.
Maxim's MAX40242 is a 20V,Low Input Bias-Current,Low-Noise,Dual Op Amp,operating from 2.7V to 20V or dual supply ±1.35V to ±10V, consuming only 1.2mA of static current per channel and 2pA maximum input bias current Input noise 5nV/√Hz, bandwidth 10MHz, conversion rate 8V/μs.
MAX40242 is mainly used in chemical sensor interface, photodiode sensor interface, medical oximeter, precision instrument.
This article describes the main advantages and features of the MAX40242, typical application circuits, and the main features of the evaluation board MAX40242 EVK, circuit diagrams.
The features of Maxim's MAX40242● Rail-to-Rail Output
● Integrated EMI Filters
● 1.2mA Supply Current per Amplifier
● Tiny, 0.85mm x 1.65mm 8-WLP
● 2.7V to 20V Single Supply or ±1.35V to ±10V DualSupplies
● 2pA (Max) Input Bias Current
● 5nV/√Hz Input Voltage Noise
● 10MHz Bandwidth
● 8V/μs Slew Rate
The application of MAX40242● Medical Pulse Oximetry
● Industrial: Process and Control
● Precision Instrumentation
● Chemical Sensor Interface
● Photodiode Sensor Interface
The descriptions of MAX40242 EVK
The MAX40242 evaluation kit (EVK) provides a proven design to evaluate the MAX40242 low-input bias current, low-noise operational amplifier (op amp) in an 8-pin μMAX® package. The EV kit circuit is preconfigured as noninverting amplifiers, but can be adapted to other topologies by changing a few components. The component pads accommodate 0805 packages, making them easy to solder and replace. The EV kit comes with a MAX40242ANA+ installed.
MAX40242 EVK Outline Drawing
The key features of MAX40242 EVK
●Accommodates Multiple Op-Amp Configurations
●Accommodates Easy-to-Use 0805 Components
●2.7V to 20V Single Supply or ±1.35V to ±10V Dual Supplies
●Proven PCB Layout
●Fully Assembled and Tested