Opamp reference

dark · Oct 24, 2009

Hi,

I am wiring opamp in differential configuration . The non inverting pin has a divider 40K by 10K referenced to GND and the signal reference of 10V is to be aplied to one end of 40K resistor. My question is should this reference of 10V(REF01) require any buffering ?

Thanks

BrownOut · Oct 24, 2009

Post a schematic. Also describe the reference voltage generator, and post a schematic of it if possible.

dark · Oct 25, 2009

Here is the schematic. Does the reference IC requires a buffer?

BrownOut · Oct 25, 2009

I don't know what the IC is, but 50K is alot of resistance, so I'm going to say that a buffer is not required.

dark · Oct 25, 2009

BrownOut said:
I don't know what the IC is, but 50K is alot of resistance, so I'm going to say that a buffer is not required.

In my first post I say the number REF01 .

Thanks

BrownOut · Oct 25, 2009

No buffer required.

dark · Oct 25, 2009

BrownOut said:
No buffer required.

Thanks , can you help me with how/what to look for in the REF01 specs . It doesnt says how much load can it drive?

BrownOut · Oct 25, 2009

There is a spec for load regulation, given in ppm for 0 - 10 mA

dark · Oct 25, 2009

BrownOut said:
There is a spec for load regulation, given in ppm for 0 - 10 mA

I am sorry I checked it again and again https://www.electro-tech-online.com/custompdfs/2009/10/REF01.pdf but couldnt locate the said spec in ppm , but ony a work case regulation of 0.012%/V for REF01H on page 3 .

BrownOut · Oct 25, 2009

It's given in %/mA on page 3.

dark · Oct 26, 2009

BrownOut said:
It's given in %/mA on page 3.

Thanks for the help , that was a typo on my behalf "%/V" .

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