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LMH6554* NOISE

eli
Guru 13485 points

Other Parts Discussed in Thread: LMH6554

what is a Reflected to Input (RTI) noise of the National LMH6554 Vocm input?

B.regards

Eli

  • 0
    TI__Mastermind 22825 points

    The datasheet value of input referred noise voltage and noise current are measured results using the circuit of Fig. 6 and include the noise contribution of VCM common mode path, if any:

    It is expected that the voltage applied to the VCM input is capacitively decoupled (low pass filtered, e.g. 0.1uF shunt cap) to eliminate any noise added from that voltage node.

     

    I know that this was not the question but, application Note AN-1719 states that the output noise of a CFA FDA (like LMH6554) is dominated by the input referred current noise * RF. So, it does look like one need not concern himself with any additional noise contribution from the VCM path.

     

    http://www.national.com/an/AN/AN-1719.pdf