Electronics > Projects, Designs, and Technical Stuff
Testing DAC performance
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jaromir:
I made the INL chart from OPs data, I cut off the non-linear part from start and end of range.
The DAC seems to fit the specs.
exe:
thank you all very much. To me plots look good. Is it a cheap dev board from China?
aheid:

--- Quote from: exe on January 31, 2020, 03:31:22 pm ---thank you all very much. To me plots look good. Is it a cheap dev board from China?

--- End quote ---

As I mentioned above, it's this board from RobotDyn: https://robotdyn.com/stm32f303cct6-256-kb-flash-stm32-arm-cortexr-m4-mini-system-dev-board-3326a9dd-3c19-11e9-910a-901b0ebb3621.html

They have an AliExpress webshop as well: https://www.aliexpress.com/item/33016045350.html?spm=2114.12010612.8148356.22.529287d4PKhlJX

The form factor is identical to the cheap "bluepill" STM32F103 boards, but they've done their own PCB layout which is, AFAIK, better. For one, USB actually works. They also use slightly different components. This is reflected in the price of course which is a tad higher, but worth it in my view.

When measuring a LM385Z-1.2 using the built-in ADC, I got much less noise with the RobotDyn STM32F103 board compared to the "classic" bluepill board I got, simply by swapping boards on the breadboard (~1LSB vs ~3LSB).

Overall been very pleased with the stuff from RobotDyn.
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