Other Parts Discussed in Thread: REF200, OPA277, OPA602, OPA192, OPA189, OPA211, TINA-TI
Dear Sirs
I am trying to design a very accurate, very temperature stable current source. I have not found a dedicated current reference that is suitable so I will use a voltage reference to build one. In application bulletin sbva001, the author uses an OPA111 op-amp. In the REF102 data sheet, the same circuit uses an OPA277 op-amp. In addition, the REF200 data sheet recommends OPA128 or OPA602 op-amps be used to extend the current range of the REF200. All of these op-amps are low bias current, FET front end op-amps. In these applications, what is the more important specification of the op-amp? Is it input bias current, input bias current offset, input voltage offset, low noise or something else? Please advise me how to choose the best op-amp for this application. Thank you for your time.