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TMS320C6748: ADS4242 can be connected to C6748?

Sung-IL
Mastermind 28755 points
Part Number: TMS320C6748
Other Parts Discussed in Thread: ADS4242,

Dear Champs,

Could you please check if ADS4242 can be attached to TMS320C6748 to receive 2ch data with 4 ~ 32MSPS ?

I think upp of C6748 can be used to receive 2ch data from ADS4242, and want to check if there is any issue to use upp port of C6748.

If upp is right peripheral,  could you please let me know how ADS4242 can be connected to upp of C6748?

When I checked below wiki, it seemed it is OK to make 'ENABLE' and 'START' pin to be un-connected(NC), but I have no idea how clock should be connected.

It seemed upp requires clocks per each channels(e.g. 2 clocks required for 2 channels), but ADS4242 has only 1 clock output for 2 channels.

Thanks and Best Regards,

SI.

  • 0
    TI__Guru**** 161600 points
    Hi,

    Have a look at Section 7 Pin Configuration and Functions in ADS4242 Datasheet. The ADS output is differential output in LVDS Mode & ADC output data bits in CMOS mode.

    In LVDS mode you cannot directly connect the ADS4242 to TMS320C6748, you need to use ADS -> FPGA <-> DSP (refer to Section 10.2 Typical Application).

    In CMOS mode you could use the connection described in processors.wiki.ti.com/.../Introduction_to_uPP However in this case you may have to implement level shifters to match the voltage levels of the DSP & ADS.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    TI__Mastermind 28755 points

    Thanks for immediate response and comments.

    Yes. I'm thinking to use CMOS mode of ADS4242.

    When I checked datasheet, ADS4242 can support 1.8V IO and upp of C6748 is dual-voltage IO,  right?

    If so, there is no need for voltage level shifter of the DSP & ADS, right?

    C6748:

    ADS4242:

    Thanks and Best Regards,

    SI.

  • 0 in reply to Sung-IL
    TI__Guru**** 161600 points
    Hi,

    When I checked datasheet, ADS4242 can support 1.8V IO and upp of C6748 is dual-voltage IO, right?

    If so, there is no need for voltage level shifter of the DSP & ADS, right?


    Correct.

    Best Regards,
    Yordan