• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 48 subscribers
  • Views 606 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

LMV358A: Are these appropriate values for an RC lowpass prefilter? What is the input impedance of this device?

Zhi Jing
Prodigy 70 points

Part Number: LMV358A

Tool/software:

Hello all,

I am putting a rc lowpass filter before the in+ input of this opamp. Their values are as shown:

Are these values appropriate?

What is the input impedance of the op amp? This information is not available in the datasheet.

  • +1
    Guru 321670 points

    These values are appropriate for an R-C filter with a cut-off frequency of about 408 Hz.

    The inputs do not behave like resistors (see figure 5.2). Their impedance is approximately infinite; the input bias current is specified as typically ±10 pA.