STM32F373 DAC noise?

[carpenter]

Posted on March 11, 2016 at 00:21

Where do I find information about noise of DAC in STM32F373, for example

Output Noise Spectral Density ?

[Amel NASRI]

Posted on March 14, 2016 at 15:20

Hi ismail.carpenter,

Your request is not so obvious, could you please provide some more details?-Mayla-

[jogerh]

Posted on March 14, 2016 at 21:49

Hello,

the DAC noise depends on the sampling rate and the bit resolution you’ve chosen. If you have 4096 steps to sample 3 V one would expect to get roughly 1 mV per step (~70 dB SNR) however depending on the setup you're using  (e.g a disco board) it might get worse. I’ve seen some 20 mV PP noise with repetitive 100 mV peaks inside on the scope screen while the STM32F37x DAC was outputting a constant voltage.  However as mentioned this depends on the current setting (e.g. also what kind of periphery is additionally activated). Sometimes it’s useful to consider a reconstruction filter.  Depending whether the application is a highend one would also consider to use a synthesizer ic instead to reach higher performance. 

[AvaTar]

Posted on March 15, 2016 at 06:58

> Depending whether the application is a highend one would also consider to use a synthesizer ic instead to reach higher performance.

I'd second this. Having analog units (DAC, ADC) on the same silicon as digital circuitry switching in the high-MHz-range is incompatible with the idea of ''high end''. ADCs and DACs on a microcontroller are always a compromise and a convenience. If you need maximal quality, use external units.