Differential_sensing_for_the_type_K_thermocouple

Published:2009/7/24 2:23:00 Author:Jessie | From:SeekIC

Fig. 13-16 This circuit combines full-differential sensing and filtering for a type-K thermocouple. The circuit has 120-dB dc common-mode rejection if all signals remain within the LTC1043 supply-voltage range. The LTC switched-capacitor building block transfers charge between the input flying capacitor and the output capacitor. The LTC1043 commutating frequency, which is settable, controls the rate of charge (and hence the overall bandwidth). The differential inputs reject noise and common-mode voltages (within the LTC1043 supply range). Excursions outside these limits require protection networks, as shown in Fig. 13-16B. As in Fig. 13-15, the optional pull-down resistor permits negative readings. The 1-MΩ resistor provides a bias path for the LTC1043 floating inputs. Linear Technology. Linear Applications Handbook 1990 p AN28-6.



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