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use REF3033 for VREF+ #206

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mck1117 opened this issue Jan 29, 2021 · 0 comments
Open

use REF3033 for VREF+ #206

mck1117 opened this issue Jan 29, 2021 · 0 comments

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@mck1117
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mck1117 commented Jan 29, 2021

Right now VREF+ is connected to AVDD, which is derived from the not-very-accurate 3.3v regulator. Adding a proper reference like the REF3033 (available at JLC!) will improve accuracy of analog readings.

The AMS1117 is rated for +-2% accuracy with no rating for temperature compensation
The REF3033 is rated for +-0.2% accuracy with 50ppm/C maximum temperature compensation
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