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DS90LV027A: Voltage Level Issue with LVDS DS90LV027A,

Ashno James
Prodigy 60 points
Part Number: DS90LV027A

Hi,

We are facing some Voltage Level issue with LVDS. In our case we have to setup an LVDS communication with an FPGA EVK to our DUT. DUT LVDS line is 2.5V. The FPGA pins which is available in  FMC connectors is at 1.2V level. So we need to set this 1.2V single ended IOs to LVDS differential lines that can be communicate to 2.5V LVDS. We are planning to use DS90LV027A as LVDS driver, and SN74AVCT774 as level shifter ( FPGA end to driver input level shifting). Is it OK to connect the differential LVDS out from  DS90LV027A driver to 2.5V LVDS differential line? ( Supply voltage of   DS90LV027A  is 3.3V, so does it swing at 3.3V?)  Attaching a document regarding this issue. Please help....

snla307.pdf

  • 0
    TI__Mastermind 43795 points

    Hi,

    The DS90LV027A LVDS output will be biased around a common mode voltage of ~ 1.2V.  Even though the supply voltage is 3.3V, the output swing will have a DC level between 1.4V and 1.0V.  This is 100% compliant to LVDS and 100% compatible to a LVDS receiver with a 2.5V supply voltage. 

    The translation you describe from 1.2V FPGA single-ended to 3.3V single ended using the SN74AVCT774 would work well as an input to the DS90LV027A.

    Regards,

    Lee