Q
For CN0300, could the ADuCM361 be used – in other words implement thetemperature readings and DAC feedback control with just one ADC instead of 2?
A
As the circuit is currently built, if one ADC is used for everything, the DACoutput voltage is not stable. The instability occurs when AIN9 is
enabled/disabled as the ADC input channel. When this change occurs, the input
impedance on AIN9 changes due to switches on the input MUX being turned off/on.
When AIN9 is always selected as the input to AIN0 as is the case for this
ADuCM360 implementation, this is not an issue.