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AMC3336: FPGA sample design for Modulator Output

ttd
Mastermind 7790 points
Part Number: AMC3336

Dear Technical Support Team,

Do you have sample design   and documentation for Modulator Output.

Datasheet "Figure 7-4. Analog Input vs Modulator Output" doesn't have detail how to calculate the analog input value from  Modulator Output on FPGA.

If you have general documentation about delta sigma modulator with FPGA, could you share it? 

Best Regards,

ttd

  • 0
    TI__Guru**** 171025 points

    Hi ttd,

    Your FPGA would need to implement a digital filter that processes the bit-stream from the AMC3336.  You can follow this app note that was written for a different modulator, but the process is exactly the same.  The filter accumulates the 1-bit data from the bit-stream and then provides a decimated value of the analog input voltage.  Our C2000 controllers offer this function as a peripheral on the MCU called the SDFM, or Sigma Delta Filter Module that can be configured to do the digital filtering on-chip without the need for a dedicated FPGA..