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TMDSDOCK28335: f28335

hamid naseem
Prodigy 40 points
Part Number: TMDSDOCK28335

I want to measure high-frequency(~50Khz) voltage/current using f28335 DSP. 
Can anyone kindly recommend me a voltage and current sensor that can be directly connected to the f28335 DSP board? (The analogue input voltage to the board should be in the range of 0-3V)
Thank you

  • 0
    TI__Guru 60865 points

    Hi Hamid,

    Your question is a bit vague, but generally the easiest way to get your signal into range for the ADC is to use some op-amp based signal conditioning circuits.  

    For your voltage signal, usually this is just a matter of amplifying or attenuating the signal and adding some offset to get it into the range of 0 to 3V. 

    For your current, the easiest thing to do would be to use a current shunt (just a small resistor, say 1ohm, 0.1ohm, or 0.01ohm depending on the magnitude of the current) to turn the current into a voltage, at which point you can do the same things as before (amplify and add offset using an op-amp to get the signal into the correct range).  If the common-mode of the current can vary significantly, you might need an instrumentation amplifier instead of an op-amp for the initial current-to-voltage conversion.  There are also dedicated current sensing solutions where you pass a wire carrying the current through the sensor coil.  

    Be aware that there are also some requirements for driving the ADC.  See the TI precision labs video series here https://training.ti.com/node/1139106 as well as the C2000-specific app. note here for some additional information: https://www.ti.com/lit/an/spract6/spract6.pdf