Is ADT7420 can be used for differential temperature measurements as AD590. I need output of differential temperature with accuracy of .001 deg.C in measurement with out calibration.
I'd say the same application could not be configured in ADT7420, note that this is a digital sensor. Its outputs is just a digital word, proportional to the absolute temperature the sensor is exposed to. I'd say, if differential temperature is required, you could place a sensor in each of the location desired and by software calculate the temperature difference. However, the accuracy of each sensor will be the stated on the datasheet, depending on the temperature range.
Can you suggest us best temperature sensor if we need the resolution of 0.001 deg.C
ADI's best resolution sensor is 16-bit, as the one you pointed, which means 0.0078C. Just to avoid confussions, accuracy in turns is +/-0.25C.
Please find further clarification of these terms here if needed: https://ez.analog.com/message/51935#51935
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