DAC signal noise on Teensy 3.2

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JulesMhz

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Hello,

I'm using DAC output to generate 170mV, but when I look the signal on scope I can see a lot of noise (see attached), do you have any idea of the origin of the noise ?

I tried to connect my scope to GND and AGND, and with two different scope, the problem is the same.

Here is my code :

analogWriteResolution(12);
analogWrite(A14, 211);

I tried with a lower resolution and higher voltage and the problem is the same.

I have welded a piece of metal on the A14 pin, and maybe the soldering iron was too hot, do you think it could be the cause ?

Thank you for your help.


IMG_20190902_205030_resized_20190902_085605144.jpg
 
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