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FAQ. In AD7124-4/AD7124-8, Can multiple devices use a common SPI bus since DOUT/RDY are shared?

Answer: For a system that uses multiple ADCs, the interface can be simplified by synching the devices. For example, configure one ADC as the master and configure the remaining ADCs as slaves. The clock from the master device can then be used as the clock for all parts. Writing a common command to all devices such as selecting continuous conversion mode will reset all ADCs. The customer would then only need to monitor the DRDY signal from the master device. When the master DRDY goes low, read its conversion. At this point, the other ADCs will also have conversions available so their DRDY signals do not need to be monitored. This architecture would simplify the connections between the ADCs and the uC. With this architecture, it is important that all conversions from the ADCs are read back before the next conversion from the master ADC is ready this ensures that all conversions from ADCs are read (ensures no conversions are missed)