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AD9957 - Cannot Program Device

Question asked by johnnyp on Feb 25, 2015
Latest reply on Mar 3, 2015 by sitti

Having an issue programming the device.

  • The IO_Reset toggles correctly
  • The Ref_Clock input seems correct
  • All of the SPI lines look correct.
  • The IO_Update appears correct, but the registers are not updated. Therefore we do not get a PLL_Lock signal out.

 

Question: Does the Master Reset have to be toggled after power up for the device to work? I say yes but seems that was not done in the firmware as there is no information about the timing of this signal in the datasheet.

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