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LMH5401-SP: Operating the LMH5401-sp below unity gain

David Durachka
Intellectual 400 points
Part Number: LMH5401-SP


Good morning,

Can the LMH5401-sp be operated beneath unity gain?  I might be experimenting with gains of .25 to .5, please advise if you think this would be an issue for this part.  (Some opamps don't like operating below unity gain...)

Dave Durachka

  • 0
    TI__Genius 14540 points
    Hi Dave,

    Yes, the device can operate in this mode but in order to maintain stability the noise gain must be manipulated. This technique is described in the following reference design document: (www.ti.com/lit/ug/tiduai1/tiduai1.pdf) . Also, the TINA model for the LMH5401-SP is now available in the product folder (www.ti.com/.../toolssoftware). If you send me the following requirements I can send you back a webench design with something close to what you need.

    Voltage Gain
    Input Signal Amplitude
    Input Signal fc and BW
    Bipolar or Unipolar power supply
    AC or DC coupled input
    AC or DC coupled output
    Source impedance
    Load Impedance
    Can transmission line reflections be mitigated by close proximity source and load (i.e. no impedance matching to improve efficiency)

    Thanks,
    Christian
  • 0 in reply to Christian Yots
    TI__Genius 14540 points
    Closing this thread as discussion moved to email to protect design details.

    Thanks
    Christian