Hi AC Guy! We don’t specify the internal sensor accuracy, but it is on the order of ~5 deg. C accuracy based on characterization review (not guaranteed though). Therefore, without your application running over temp testing and calibrating the internal temp sensor voltage, I wouldn’t recommend it using it for measuring the cold-junction temperature, as the error here will translate directly into an RTD error. For PCB, we have a CAD symbol ( www.ti.com/.../pinout-quality) but not a recommended layout for this specific application. We also have the ADS1261EVM that you can review as well.
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