Operational amplifier GXX350 is compatible with the OPAX350 for PM2.5 measurement devices

PM2.5 detection devices not only play a role in environmental quality testing, but also in the industrial and automotive fields. This article mainly introduces the rail-to-rail operational amplifier GXX350 (compatible with OPAX350) in the PM2.5 detection device applications.

First of all, the GXX350 has an input bias current of ±0.5pA, which is very suitable for applications in this kind of ultra-large ohmic source impedance, so that the undesired input voltage on the resistor will be very small. In addition, the GXX350 (compatible with the OPAX350) has very low noise, which ensures higher and more stable output accuracy.

In the PM2.5 detection device temperature and humidity has a great impact on the detection accuracy, for example, when the relative humidity is greater than 60% or more, fine aerosols such as PM2.5 particles will absorb moisture to increase, resulting in the detection of the data will be false high, so it is necessary to calculate the exact PM2.5 concentration based on the size of the detected humidity, and in the temperature and humidity sensor needs to be behind the op-amp signal amplification, the GXSC GXX350 (compatible with OPAX350) is the most suitable solution. The GXSC GXX350 is perfect for this.

First of all, the GXX350 has an input bias current of ±0.5pA, which is ideal for applications with very large ohmic source impedances, so that the undesired input voltage across the resistor is very small. In addition, the GXX350 is a dual-channel op-amp that can be used to amplify the signals of both temperature and humidity sensors. the GXX350 also has very low noise, which ensures higher and more stable output accuracy.

GXX350 main advantage features:

1, high bandwidth 38MHz, high conversion rate 22V/μs;

2, integrated dual-channel op-amps, miniature MSOP-8 surface mount, SO-8 surface mount and DIP-8 packages, saving PCB board area;

3, low noise: 5nV/√Hz;

4, for the temperature range of -45 ℃ to 125 ℃;

5, stable supply, cost-effective.