Calibration of the AD7711 in Compensating Temperature and Reference Schematic
Calibration of the AD7711 in Compensating Temperature and Reference Schematic -As described in the previously article about the AD7711, this family of ADCs device are designed specifically for low frequency, high accuracy industrial transducer applications.
This device has an on-chip self calibration to compensate for temperature drift and reference inaccuracy.
It is known about the possibilities to calibrate the ADC to very high accuracy when the local reference voltage is inaccurate in such microcontroller based systems.
The picture above shows the Schematic of High Accuracy Calibration Using AD7711.
A reference voltage of 2.5 V is generated by driving one of the RTD current sources of the AD7711 through a 12.5 kW resistor…Apart from the temperature coefficient of the 12.5 kW resistor, the voltage generated across the thermistor, will be drift-free relative to the reference voltage.
(source: analog.com, AD7711 application note).
Tags: Calibration, reference, schematic, ADC calibration, Temperature,