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AMC1210: is it possible to handle two resolvers with one chip

Yurii Cherniavskyi
Prodigy 10 points
Part Number: AMC1210
Other Parts Discussed in Thread: ADS1205, ADS8361, ADS1204

Tool/software:

We want to connect two similar resolvers to a single AMC1210 chip. The first resolver will be connected to FILTER MODULE 1 and 2, and the second resolver to FILTER MODULE 3 and 4. The carrier signal to the resolvers will be driven through an operational amplifier.

Is it possible for the AMC1210 chip to correctly handle two resolvers?

If yes, what are the correct steps to calibrate the Signal Generator (PCAL and SCS1–SCS0 bits of the Clock Divider Register) for two resolvers?

  • 0
    TI__Guru**** 172996 points

    Hi Yurii,

    Welcome to our e2e forum!  Sounds like an interesting project you have here!  As depicted on the front page of the AMC1210 datasheet, you could use two ADS1205 modulators with two resolvers, however getting the phase calibration to work would be tricky I believe since you can only choose one filter module to calibrate against.  Here is an application note that describes using the AMC1210 with a resolver: SBAA144

    A potentially easier solution, at least for capturing the SIN/COS signals from your resolvers, would be an ADC like the ADS8361.  The ADS8361 has two independent ADCs with two 2-channel multiplexors.  You can sample SIN/COS simultaneously from your first resolver on channels A0/B0 and then sample the second resolver on channels A1/B1. 

  • 0 in reply to Tom Hendrick
    Prodigy 10 points

    We plan to use one ADS1204 modulator, connecting the first resolver via CH A and CH B, and the second resolver via CH C and CH D.

    Could you please provide more details about potential problems that could arise due to the ability to calibrate the phase for only one filter module? Perhaps there is a technique to achieve this more accurately than simply running calibration for a single hardcoded filter module. The wire length to both resolvers is almost identical (with only a few centimeters difference).

    Regarding your suggestion to use the ADS8361, implementing all the filtering logic on the MCU is possible. However, we prefer to keep this as a last resort if we determine that the AMC1210 cannot be used for our case. We are also hesitant to use two AMC1210 chips, one per channel, due to space constraints that such solution might compromise.

  • +1 in reply to Yurii Cherniavskyi
    TI__Guru**** 172996 points

    Hi Yurii,

    If you read through the application note I pointed you to, the calibration looks for a zero-crossing to compensate for phase differences.  I'm not sure how easy that is going to be when using two resolvers.