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STM3220G-EVAL ADC noise comes from USB OTG PHY

aa_thomas
Associate
Posted on April 25, 2012 at 09:01

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

#stm32-stm3220g-stm32f2-adc-noise
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