EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: tom66 on October 30, 2023, 03:29:45 pm
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We have a system with a 14-bit ADC where we need to assess the noise of the system, to determine if a noise problem is caused by the sensor or our amplifier electronics.
The input signal is typically around 1-2V DC. So we would need a reference with a noise of around 10uVrms (as our quantisation noise is 120uV at 1LSB) to see how much noise is being contributed by this.
I thought some inexpensive 1.25V multimeter reference e.g. for a 6 1/2 digit multimeter, for the voltnuts on here, would be good. Any suggestions?
This is a work project so cost is not too critical but timescale is reasonably, so we ideally want to just buy something pre-calibrated and tested that we can hook up, put in a nice shielded environment and make the measurement.
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I personally would get a REF5020 because I used that on several designs. There are better/newer chips though. I'm sure Linear technology will have something better if you really want.
Power it from a 9V battery and place it in a metal box.
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Are you aware of any REF5020s that come on a development/test board? I couldn't find any. Ideally we'd not spin a PCB like this, too much engineering time spent. Happy to spend, say $/£/€50-100 on a reference board and be done with it.
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Are you aware of any REF5020s that come on a development/test board? I couldn't find any. Ideally we'd not spin a PCB like this, too much engineering time spent. Happy to spend, say $/£/€50-100 on a reference board and be done with it.
AD has a number of development boards for low noise references, for example this one for 1.2V (https://www.mouser.co.uk/ProductDetail/Analog-Devices/DC2432B-A?qs=sGAEpiMZZMuqBwn8WqcFUj2aNd7i9W7u2VVAdel4YaHSpu9MmuNmyg%3D%3D).
Or this one for 2.5V (https://www.mouser.co.uk/ProductDetail/Analog-Devices/EVAL-ADR3625EBZ?qs=sGAEpiMZZMuqBwn8WqcFUj1SFkunHY10aKCk3vAmG1hxwFjd%252BIslPA%3D%3D).
Cheers
Alex