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LMH2832: LMH2832 SPI signal min. V_IH voltage

Youngho Suh
Intellectual 490 points
Part Number: LMH2832

Hi,

In LMH2832 data sheet, V_IH is rated as 1.4V to Vcc. From my FPGA, LVCMOS18 Voh min. is Vcc-0.45V which is 1.8V-0.45V=1.35V for my application. I want to know if SPI control voltage can support 1.35V as a min. for V_IH. or if this is too low, we need level shifter to support this. can you advise for it?

Thanks 

  • 0
    TI__Genius 15975 points
    Hi Youngho,

    I think the 1.35V is within the noise margin of the LMH2832 device inputs as the VIH rating is from 1.4V to Vcc. It is it possible that in certain scenarios across process or temperature, this 1.35V may not be properly detected as logic 1 by the device. So, I would recommend to put a level shifter to support the device logic levels.

    Best Regards,
    Rohit