The AD411x devices have one data register, therefore only one conversion result is stored at any given time. When several channels are enabled, the ADC will automatically sequence through the enabled channels, performing one conversion on each channel before moving to the next. Therefore, it is important to ensure the current conversion result is read before the next conversion is complete. The data register is updated as soon as each conversion is available. The DRDY/RDY output pulses low each time a conversion is available. The user can then read the conversion while the ADC converts the next enabled channel. Figure 3 shows an example of timing diagram when ADC is in continuous conversion mode.
Figure 3 Continuous conversion mode