My designing now use AD7792 chip to measure the thermocouple input.
AD7792 chip have the Bias voltage generator, it sets the common-mode voltage of a channel to AVDD/2. It is useful in thermocouple applications.
And, due to special reason, now, I need Open the bias voltage -> measure the thermocouple input(with BOOST bit active, This reducesBias voltage power-up time) -> Close the bias voltage, then, repeat this process forever. The time of each this loop process is 200mS about, it means that each 1 second, bias voltage need be ON/OFF 5 times.
Could you helps to check whether it is acceptiable for AD7792? whether it will damage the chip.
It may not damage the part but the safest thing to do is to disconnect as well the analog inputs to the ADC. Please take note as well that Vbias has a power-up time which is dependent on the load capacitance…