Maxim MAX40242 20V低輸入電流低噪音雙運放解決方案

Maxim 公司的MAX40242是20V低輸入偏置電流低噪音雙運算放大器,工作電壓從2.7V到20V或雙電源±1.35V到 ±10V,每路僅消耗靜態度電流1.2mA,最大輸入偏置電流2pA,輸入噪音5nV/√Hz,帶寬10MHz,轉換速率8V/μs,主要用在化學傳感器接口,光電二極管傳感器接口,醫用血氧儀,工業過程與控制和精密儀器.本文介紹了MAX40242主要優勢和特性,典型應用電路以及評估板MAX40242 EVK主要特性,電路圖,材料清單和PCB設計圖.

The MAX40242 provides a combination of high voltage,low noise, low input bias current in a dual channel andfeatures rail-to-rail at the output.

This dual amplifier operates over a wide supply voltagerange from a single 2.7V to 20V supply or split ±1.35Vto ±10V supplies and consumes only 1.2mA quiescentsupply current per channel.

The MAX40242 is a unity-gain stable amplifier with again-bandwidth product of 10MHz. The device outputsdrive up to 200pF load capacitor without any externalisolation resistor compensation.

The MAX40242 is available in 8-thin wafer-levelpackages (WLPs) and is rated for operation over the-40℃ to +125℃ automotive temperature range.

MAX40242主要優勢和特性:

●● 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
●● Rail-to-Rail Output
●● Integrated EMI Filters
●● 1.2mA Supply Current per Amplifier
●● Tiny, 0.85mm x 1.65mm 8-WLP

MAX40242應用:

●● Chemical Sensor Interface
●● Photodiode Sensor Interface
●● Medical Pulse Oximetry
●● Industrial: Process and Control
●● Precision Instrumentation

圖1.MAX40242典型應用電路

圖2.MAX40242高阻抗源/傳感器預放大應用電路

評估板MAX40242 EVK

The MAX40242 evaluation kit (EV kit) 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.

評估板MAX40242 EVK主要特性:

Accommodates Multiple Op-Amp Configurations
Rail-to-Rail Outputs
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