TMS320F280025: input differential signals

Hello Yanming,
the AMC1302 has differentieal outputs. How to connect to the F280025 ADC? Can we connect differential signals to the F280025 ADC?

Regards, Holger

Hi Yanming,
I don't know how this link will solve my questions. Please give me an detailed answer otherwise I have to ask the app guys from C2000 PL directly!

Regards, Holger

Add an amplifier to convert the differential output to single-ended output (0~3.3V) for the ADC input of the F280025C as the circuit in the application note.

Interfacing a Differential-Output (Isolated) Amp to a Single-Ended Input ADC (Rev. A)

Hi Yanming,
thanks for the answer. Is it also possible to use 2 ADC F280025 inputs instead of the OpAmp?

Regards, Holger

Hi Holger,

HS FAE Germany said:

thanks for the answer. Is it also possible to use 2 ADC F280025 inputs instead of the OpAmp?

What you are referring to is pseudo differential. Theoretically it should work but there are some practical limitations which you will ran into. For this to work well, the 2 ADCs have to be matched exactly for all specifications like offset, gain, linearity etc but in reality they are not. This will in turn introduce more errors into your system because the 2 ADCs are not perfectly matched. You will be better of using a differential to single-ended opamp as Yanming suggested.