Need help finding right ADC

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Atlas83
 
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Joined: Thu Oct 20, 2022 1:14 am

Need help finding right ADC

Post by Atlas83 »

Hi everyone!

I am trying to read a vacuum sensor by converting a voltage signal to a digital signal using an Analog to Digital Converter with a raspberrypi 4 and need help picking the right ADC. My goal is to have the highest precision as possible which I believe means I’d need to measure as low as 1mv (0.001v)

1- Can someone recommend me the right Adafruit ADC?

2- Can someone describe what 5V5T and LBD mean and which might be better for my application?




The vacuum sensor manual says:

Analog Output
The unit has an analog output. This analog output is normally scaled by 5V5T volts. LBD volts are also available, as described below.

5V5T Provides a voltage output proportional to vacuum reading which ranges from 0-5 volts at 1mV per mTorr (1 micron = 1mV, 5 Torr = 5 Volts)

A Linear by Decade scheme where the leading digit is scale, and the last digit is the vacuum reading. For example: 0.995 Volts = 0.995 Torr, 1.010V = 10.1T,
2.1V = 100T, and 3.760V = 760T



Link to Vacuum Sensor documentation:

https://www.ajvs.com/library/DigiVac_Mo ... _Sheet.pdf

Thanks!!

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Franklin97355
 
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Joined: Mon Apr 21, 2008 2:33 pm

Re: Need help finding right ADC

Post by Franklin97355 »

I'm not sure about ADC bits but this should give you a great resolution.

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