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I have a PmodAD5 Analog to Digital converter capable of high precision with differential input capability. It use the Analog Device AD7193 ADC converter and also Analog Device ADR441 as an on-board 2.5 Vdc Voltage Reference. The Analog Device spec sheet for the ADR441 specify 2 different noise level for category A or B chip version. On the board, chip ADR441, one can read R02. I believe it is the Branding of the chip, like shown on page 18 of the spec sheet (but I am not sure if that's what it relate to). Though I am not aware what Branding means in this case. I am trying to determine if this ADR441 chip is of category A or B. According to the spec sheet, ADR441A would mean that the chip is a 10ppm/oC noise level, and ADR441B would be a 3ppm/oC noise level. Not that it would make a big difference for my project but I'd like to know what version in on my PmodAD5 board. Does anyone happen to know the information ? Thanks for your help