Other Parts Discussed in Thread: TMS320F28335,
Hello All,
Background:
I have a proper OPAMP and RC circuit input as suggested for ADC Input signal.
Problem description:
When ever I receive CAN Message (CAN Interrupt), the analog input signal is getting a dip. Initial Analog input is proper but after some time, there will be a dip in the signal. what is causing this Dip. Approximately around 160ms the signal is proper. Later Signal will get a dip.
For example: say the input is 0.8V means, initially it will be around 0.79V and later it ill be around 0.73V.
Testing:
To confirm that it is not due to external signal, above test is done by supplying 0V to analog input, Then it is observed that a dip of around - 0.3V is seen, when CAN Message is received (ADC Not initialized, No Clock for ADC during this test )
Conclusion:
Hence there is some noise due to the internal circuit of Micro controller. It might be CAN or something other.
Due to this dip, ADC reading is not accurate.
Question:
What can be the reason for the dip observed? How to Avoid this Dip in input signal?