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LMH6881: LMH6881 Single-ended input impedance 50Ω

Tom Li
Prodigy 10 points
Part Number: LMH6881

Hi All,

Refer to LMH6881 datasheet , single-ended input impedance is about 50 Ω .  Actually I use vecter network analyzer to measure the input impedance and found the single-ended input impedance is very low and about 4Ω. I checked PCBA signal path impedance and its impedance is about 50Ω , but after LMH6881 soldering  , the impedance changed from 50Ω  to 4Ω . 

Could anyone advise it , thanks in advance.
      

  • 0
    TI__Expert 6050 points

    Hi Tom,

    Would you be able to provide more details about your test setup and if possible a PCB layout or images showing the board to assist in troubleshooting? Can you confirm that in soldering, you did not short any trace pads as well?

    Thanks,

    Nick