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ADS5240: ADS5240 LVDS level shifter.

Jimmy Chou40
Prodigy 110 points
Part Number: ADS5240
Other Parts Discussed in Thread: SN74AVC4T245,

Hi:

I would like to connect ADSL5240 LVDS outputs ADCLK, LCLK and Serial OUT to Xilinx FPGA. But it is LVDS 1.8V not 3.3V.

How can I choose level shift IC? Can I use general digital level shift IC such as SN74AVC4T245 or need some special parts?

Can you recommend one?

Thanks

Jimmy

 

  • 0
    TI__Mastermind 29220 points

    Hi,

    These signals out of the ADS5240 are LVDS and LVDS is designed to be supply voltage independent.   The LVDS signaling is defined as a nominal 3.5mA into a 100 ohm load, with the signal biased to a common mode level of nominally 1.2V.   None of these parameters are dependent on supply voltage.  The ADC will output these signals at about 1.2V common mode, and the LVDS receiver in the FPGA is expecting to see them about the 1.2V level as well, regardless of the supply voltage at the driver or at the receiver.  No level shifting needed.

    Regards,

    Richard P.