Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 185 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.

OPA2330: Both common input resistance and differential input resistance

Ken Zhang
Intellectual 2885 points
Part Number: OPA2330
Other Parts Discussed in Thread: OPA2333P

hi,

would you like share what  both common input resistance and differential input resistance of OPA2330? this parameters are not listed in its datasheet.

  • +1
    TI__Genius 12415 points

    Hi Ken,

    This core is the same as OPA2333P, which has the input input impedances listed, see below. 

    Note that this amplifier is a zero-drift amplifier that uses a chopping architecture (https://www.ti.com/lit/an/sboa182c/sboa182c.pdf).  The switching associated with choppers can cause current injection that looks like noise at the switching frequency, but  at low frequency/DC, the impedance is still typically the same as a CMOS input amplifier. 

    Let me know if there's any other questions.

    Regards,
    Mike