• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 48 subscribers
  • Views 407 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMC6442 1/f noise

Alexis Phoenix
Prodigy 20 points
Other Parts Discussed in Thread: LMC6442

The LMC6442 is a very attractive amplifier for my application due it's very low Ib and drift, however low frequency (<0.1-10Hz) noise is also very important for me and I can't find a figure for it. Extending the graph on the datasheet it looks like it would be up to 10uV p-p, but an actual measured value would be very useful for comparing with other amps, since I'm looking for ideally better than 2uV p-p. Can anyone fill in this information?

  • 0
    TI__Intellectual 1155 points

    Hi, Alexis

    In the datasheet, it shows the voltage  noise density, how dose the 10uV p-p come out?  Usually,  voltage noise , current noise  and resistor noise will contribute to the total output noise.  If the source resistor is large, we also care about current noise. What is your application circuit? I need more information.  

    Besides, what is your requirement of the bias current and drift?  What is your supply voltage?  Do you need a rail-rail  output?  It helps if  we know more information.

  • 0 in reply to Yingying Sun
    Prodigy 20 points

    I must have been having a brainstorm because I just had another look, the noise density chart has the info I need - must have got mixed up with another one because my question suddenly makes no sense...

    But thank you for the response anyway.