hi Nikos, sorry for the late reply... it looks overall ok, just be aware that: - if not RTD is connected you have 0V reference so you can't sense the pH sensor as well - tha max REF voltage is VA - AN_GND - 1V, so having R46 = 3.3K means that the max IEXC is much less than 1mA; while if you are planning 1mA IEXC then you have to increase VA (that is decoupled from VD) - what's the purpose of R4 / R94, since that is not the normal position for the compensating resistors? - C6 nad C80 must be placed very close to IC47 all the rest seems ok (I didn't enter in detail of the values because I don't know the details of your app) hope this helped a bit KR Vincenzo PS: please note that this forum is the wrong one, actually; for the ADS1248 you should consider the following e2e.ti.com/.../
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