offset null pins to ground?

[tempus fugit]

Hey all;

I'm using a high speed opamp as a voltage follower. I'm not using the offset
null pins - should I tie them to ground or leave them unconnected?

Thanks

 

[John Larkin]

On Thu, 5 Aug 2004 22:32:40 -0400, "tempus fugit"
<toccata@no.spam.ciaccess.com> wrote:

Hey all;

I'm using a high speed opamp as a voltage follower. I'm not using the offset
null pins - should I tie them to ground or leave them unconnected?

Thanks

Unconnected.

John

 

[John Popelish]

tempus fugit wrote:

Hey all;

I'm using a high speed opamp as a voltage follower. I'm not using the offset
null pins - should I tie them to ground or leave them unconnected?

Thanks

With almost all opamps, leave them unconnected. What chip are you
using?

Offset pins often have higher voltage gain than the normal inputs do,
so keep signals that might capacitively couple to them well away.

--
John Popelish

 

[tempus fugit]

Thanks for the replies.

The chip is an ST TSH10 single wideband opamp.


"John Popelish" <jpopelish@rica.net> wrote in message
news:4112F285.B26324EC@rica.net...

tempus fugit wrote:

Hey all;

I'm using a high speed opamp as a voltage follower. I'm not using the
offset
null pins - should I tie them to ground or leave them unconnected?

Thanks

With almost all opamps, leave them unconnected. What chip are you
using?

Offset pins often have higher voltage gain than the normal inputs do,
so keep signals that might capacitively couple to them well away.

--
John Popelish

 

[John Popelish]

tempus fugit wrote:

Thanks for the replies.

The chip is an ST TSH10 single wideband opamp.

If I was laying this out and concerned about noise pickup on the
offset pins, I would put a small island connected to V- under pins 1
and 8. If I could fit a trace between those pins and the adjacent
ones, I would do that and connect it to V- also. That would keep the
output or V+ from coupling to those pins and help keep the V-
rejection at maximum.

--
John Popelish