I have a doubt about calibration of AD7705. As AD7705 FAQs: Calibration says, a calibration must be performed when there is a change in gain, update rate, temperature or when switching between channels that share coefficients registers but have different operating conditions. AD7705 has three pairs of calibration registers. If the AD7705 is used like this: the AIN1+/- is selected, set the gain as 1, and calibrate the channel. Then choose AIN2+/-, set the gain as 2, and calibrate the channel. After this configuration, switch the channels continuously to converse. Should the calibration be operated again after switching the channels? The gain should be regard as changed or not?