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AMC3336-Q1: Connect with TMS320F28377D via SDFM

Narudol Tatiyavattanachai
Prodigy 70 points
Part Number: AMC3336-Q1
Other Parts Discussed in Thread: AMC3336, TMS320F28377D, ADS1202

Dear Sir,

As I am designing High Voltage DC-Link measurement, I have not enough pulse generator for AMC3336.

So, I want to use external pulse oscillator generator at 20MHz to supply CLKIN of AMC3336.

After that, I wan to tuse SDFM (eCAP_CH-04) to measure this voltage.

Would it be applicable for such circuit design ?

And I read that AMC3336 will output 128-bit stream at 10% duty when -1V and 90% duty at +1V.

In such above case, Will SDFM module can work with prior knowing the CLKIN 20Mhz but not knowing the begining of measurement bit ?


Best regards,

Narudol T.

  • 0
    TI__Mastermind 47625 points

    Hi Narudol,

    The AMC3336 will output a continuous 1's and 0's density bit stream dependent on the input voltage. The number of bits that are collected for each measurement would depend on the SDFM settings, it is not limited to 128 from the AMC3336 perspective. Using an external 20MHz oscillator is perfectly acceptable and as the bit stream is continuous, the only downside of not knowing when the beginning measurement bit is transferred is that it will take a full cycle of data through the filter before the measurement data is valid.  

    Please let me know if this makes sense from the AMC3336 perspective or if you have additional questions. If not, I can move this thread as the TMS320F28377D is supported by another group.

  • 0 in reply to Alexander Smith
    Prodigy 70 points

    Thank you for your answer, yes, the down-side of not knowing the begging of data is what concerning me.

    Because I am not familiar with SDFM module. I will check this topic with C2000 forum again.

  • 0 in reply to Narudol Tatiyavattanachai
    TI__Mastermind 47625 points

    Hi Narudol,

    These resources may help:

    1. SBAR010 Isolated Modulator Filter Excel Calculator

    2. SBAA230 Digital Filter Types in Delta-Sigma ADCs

    3. SBAA094 Combining the ADS1202 with an FPGA Digital Filter for Current Measurement in Motor Control Applications