Observed a 0.4v difference between the actual analog voltage and the voltage read with Internal Analog Reference 1.1v, when an external analog reference voltage is connected to the AREF pin of Arduino ...
All the AD56X4 series are connected in a similar way in order for the Arduino to communicate with it by SPI (Serial Peripheral Interface). The DIN pin on the chip (pin 8 on the MSOP and LFCSP packages ...
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