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STM3220G-EVAL ADC noise comes from USB OTG PHY

Question asked by frenchie on Apr 25, 2012

Hello,

I have been doing some measurements with the STM3220G eval board using the piece of software at :
./STM32F2xx_StdPeriph_Lib_V1.0.0\Project\STM32F2xx_StdPeriph_Examples\ADC\ADC3_DMA

The ADC reading of the potentiometer has noise of about 14 codes out of 4096.
However, when I remove the jumper JP31 (USB_OTG_HS), the noise falls down to 3 codes out of 4096.

Has anyone experienced the same thing?
Has anyone managed to get no noise on the potentiometer value using this evaluation board?

regards

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