• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 47 subscribers
  • Views 2311 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.

IVC102 timing

Maarten Wassenaar
Prodigy 20 points
Other Parts Discussed in Thread: IVC102, OPA627

hi community,

I'm considering using the IVC102 for measuring small currents from photodiodes (nA). what would be a good way to time the IVC 102? What is the easiest way to get a reliable low noise timing? And what would be a good way to sample the output?

Maarten

  • 0
    Genius 5430 points

    Maarten;

    The IVC102 data sheet covers its timing requirements quite comprehensively.

    Low noise (jitter) timing can be obtained by using a crystal-controlled oscillator and dividing its output by fast logic. The ALS family is a low-cost, universally-available logic family that is appropriate.

    A good start-stop counter is an excellent method of sampling the IVC 102 output. In the past,  I have used a Fluke 1952B Universal Counter-Timer with great sucess.

  • 0 in reply to Neil Albaugh
    Prodigy 20 points

    Neil, thanks for your reply.

    I've tried to get the IVC102 to work with a 555 timer and some logic and it works. But unfortunately I get more noise than when I use a transimpedance amplifier with an OPA627. What could be the reason for this noise? Could it be timer related jitter, or is the 627 better after all?

    Maarten