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Original question:

AMC1210: Invalid measurements (glitches) on output data.

AMC1210: AMC1210

Costantino Citro
Prodigy 30 points
Part Number: AMC1210

Tool/software:

We are trying to synchronize the delta-sigma acquisition with our internal PWM cycle and we were wondering if the ack signal is periodic or not.

Assuming that the ack signal is periodic, by using the same clock (the crystal oscillator) for both the PWM and the AMC1210, we could synchronize the delta-sigma acquisition without need to check the status of the ack signal.

Is this possible?

  • 0
    TI__Guru**** 175471 points

    Hi Constantino,

    In a nutshell - the ACK output of the AMC1210 is essentially periodic, but there are various factors that go into making it so.  There is an 'MFE' bit in the Clock Divider register that synchronizes all of the filters.  If you go through and setup the various filter modules, then set the MFE bit as you last step before enabling the modulator clock, you should be able to see a synchronous ACK.  This is easier to do with a state machine based controller like an FPGA.  If you are using a micro or perhaps DSP, you may still need to keep an eye on the ACK pin.

  • 0 in reply to Tom Hendrick
    Prodigy 30 points

    We are using a microcontroller. If we use a timer to separate the start of the modulator clock and the start of the PWM readings, wouldn't this be enough to have the acquisition of new measures and the SPI reading as separate events but permanently synchronized? 

  • 0 in reply to Costantino Citro
    TI__Guru**** 175471 points

    Hi Constantino,

    You might be able to get away without monitoring the ACK pin - it is going to depend on how deterministic your routines are.  If you can add the hook into your board to include ACK, that would be my preference - if you don't need it in the end, simply ignore it.