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TMS320F280048C: How to use three SDFM channels on 65-pin devices

Johannes Wotzka
Prodigy 10 points

Part Number: TMS320F280048C

I am currently working on a design using the TMS320F28. I need 3 SDFM-channels for connecting AMC1304 ADCs, which do not support manchester encoding. The MCU's datasheet clearly states 3 available SDFM channels (Table 3-1). However, only the clock pins for channels 1 & 3 seem to be available on 64-pin devices. All four data-pins are available, though. 

Ideally, as all 3 ADCs use the same (PWM generated) clock, a single clock input into the MCU would be sufficient. Reading the documentation, it seems impossible to run multiple SDFM channels off the same clock input. Am I correct there?

Can you clarify on how I can make use of all three channels on the 64-pin devices? Or is it really only possible to use all three in conjunction with manchester-encoding, forcing me to use bigger 100-pin part?

Thanks in advance,

Johannes 

  • 0
    TI__Guru 55700 points
    Johannes,

    It looks like Table3-1 needs correction. In 64 pin package, you have access only to two channels (1 & 3).

    Unfortunately, it is impossible to run mulitple SDFM channels from same clock input on this device.

    If I were you I would use 1 SD-modulator which support manchester mode and use 2 AMC1304 for other channel if I want to persist with 64 pin package.

    Regards,
    Manoj