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AMC1100 DC voltage & current measurement

Zhongjing Wang
Prodigy 40 points
Other Parts Discussed in Thread: AMC1100, ISO122, ISO124, ISO121, AMC1301

Hello Team,

I would like to use AMC1100 to sense my battery charger. I need to measure AC voltage, DC voltage and current. Is AMC1100 available for both DC & AC measurement?  

I am going to build the circuit like TIDUA58.

Best Regards,

Zhongjing

  • 0
    TI__Guru**** 168445 points
    Hi Zhongjing,

    Welcome to the e2e Forum! Yes, the AMC1100 can measure up to +/-250 mV, you can measre both AC and DC signals within that voltage range.
  • 0 in reply to Tom Hendrick
    Prodigy 40 points

    Hi,team

    If AMC1100 is used to dc voltage sensing, the input voltage range is only 0 to 250 mV, which is little bit narrow. 

    Does TI has an isolated amplifier with larger input voltage range, like ACPL-C87B? Single polarity is fine. 

     I  want the input to be positive only and output range to be 0-3V.

    Best Regards,

    Zhongjing




  • 0 in reply to Zhongjing Wang
    TI__Guru**** 168445 points
    Hi Zhongjing,

    Currently, we have the ISO121, ISO122 and ISO124 devices available. What sort of isolation requirements do you have/need?
  • 0 in reply to Tom Hendrick
    Prodigy 40 points
    Hi Tom,

    I am planning to send the AMC1301 output to the DSP (F28027), whose ADCs are single-ended. Since AMC1301 is a fully-differential amplifier, can I just connect one pin (VOUTN) to the ADC and GND2 to the ADC ground?

    Will AMC1301 operate normally and exhibit the same linear gain?
    If it is okay, what should I do with VOUTP? Or should I float or load the VOUTP pin? And how much does it affect the accuracy?

    Regards,
    Zhongjing
  • 0 in reply to Zhongjing Wang
    TI__Guru**** 168445 points
    Hi Zhongjing,
    I would suggest that you look into doing a differential to single ended conversion after the AMC1301. You can find an example circuit in Section 4.3 of this TI Precision Design: www.ti.com/.../tidub91a.pdf

    If you wanted to forego using one of the outputs, the AMC1301 would operate normally (you won’t break it), but you would only be getting half the output range. You could use either one of the VOUTs leaving the unused output floating.