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LMH6401EVM: Use single power supply,can't work well.

Johnsen
Prodigy 100 points
Part Number: LMH6401EVM
Other Parts Discussed in Thread: LMH6401

Use dual power supply, VS+=+2.5V,VS-=-2.5V,under this power supply condition, LMH6401 work normally. But if use single power supply,VS+=5V,VS-=0V,under this power supply condition, LMH6401 can't work well.The output just like PD pin been set to high,and i make sure it set been set to low, i didn't mount the jump on Jpd. 

  • 0
    TI__Expert 7835 points

    Hi Johnsen, 

    Just to clarify, the power down pin is being pulled low when you use a single supply? Is that correct? Also, what is the value of your VOCM pin when you use the part with a single 5V supply? 

    Regards, 

  • 0 in reply to Jacob Freet
    Prodigy 100 points

    Hi Jacob:

    I just left Jpd disconnect. Because I find PD pin has a internal pull down resistor in datasheet. And I left Jpd disconnect when test on dual power condition.

    When I use a single 5V supply, I didn't meansure the value of VOCM, and I didn't supply an extra power for VOCM.

  • 0 in reply to Johnsen
    TI__Expert 7835 points

    Hi Johnsen, 

    How are you measuring the output of the amplifier? When you are using it on a single supply, the output's will be biased at 2.5V common mode by default. If you are using ground referenced test equipment, then that may be a problem. 

    Regards,