Hi Marc, Did you build your own PCB with the ADS1256 or are you using and ADS1256EVM as your hardware? Depending on how you designed and connected your circuit, it would be preferable to ground the analog inputs to the ADC's ground (AGND) net instead of the Arduino. The expected noise performance of the ADS1256 is given by Tables 1 and 4 in the ADS1256 datasheet , and depend on the configured data rate and gain. If yo aren't able to match these noise figures then likely the issue is related to PCB layout or power supply noise. Regarding your question: [quote user="marc montagut marques"]What is the recommended way to interface the ads1256 ? Would it be better to get a USB to ISP converter? [/quote] I'm not sure what you mean by a "USB to ISP" converter. If you don't mind pointing me to a link on some information I'd appreciate it. The ADS1256 has a SPI digital interface, so between the ADC and MCU you'd only have SPI and GPIO pins to interface between these device. Between the Arduino and a PC, for example, the interface is entirely up to you.
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