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PWM output amplitude of AMC1210

Wayne Xu
Prodigy 450 points
Other Parts Discussed in Thread: ADS1205, AMC1210, AMC1200, AMC1210MB-EVM, OPA1632

our customer is evaluating ADS1205 and AMC1210 as the AFE for resolver. customer use TS2640N321E64 RESOLVER. the input voltage requirement is 7Vrms as below table. but AMC1200 PWM1, PWM2 pin can only output 5V amplitude signal. it can't meet resolver's requirement. How can we solve this issue? Is a new bipolar push-pull driver circuit needed for every PWM1 and PWM2 output pin?

Could you share a driver source  C code for AMC1210 based on our C2000 MCU?

Thanks

  • 0
    TI__Guru**** 168785 points
    Hi Wayne,
    The PWM outputs of the AMC1210 are differential. You can use the circuit found in the AMC1210MB-EVM to provide drive/gain for the resolver that is being used in this application. I'll look to see if we have any source code for the C2000 class controllers.
  • 0 in reply to Tom Hendrick
    TI__Prodigy 450 points

    Hi Tom

    One more question.

    as you can see from the table of resolver. the Zro is about 178ohm. but the input signal is 7Vrms about 10Vpp. So the peak current is about 56mA. can OPA1632 handle this current requirement? the Short-Circuit Current of OPA1632 is 85mA(type). what about a simple NPN+PNP push-pull circuit to amplify the output current? 

    Thanks. 

  • 0 in reply to Wayne Xu
    TI__Guru**** 168785 points
    Hi Wayne,
    I don't believe the current would be an issue for the OPA1632, but I'll check on that with the linear guys. The transistor option would require two pair to handle the differentian PWN output. Matching may cause some errors/imbalence in the system.