Random chip of the day: spi resistor chip

[judas]

Folks,

So continuing my mission to fill the mailing list with things you
probably already know. Today's random component spam is the AD8400
digitally controlled potentiometer chip.

The cool thing about digitally controlled pots is that you can use them
from embedded procs, ards or whatever, to get a pot controlled by your
code. If you have a use for this, you might already be familiar with the
ad5204, which I think is pimped by sparkfun. Or possibly the MCP41xx and
MCP42xx series.

So why do you like the AD8400? It goes down to 1k ranges with 256 steps
in the range. With a wiper resistance of 50 ohms, so you can get down to
around 56 ohms on the low end.

These are around $3 a pop from digikey, and I am about to order a small
handful of them in about an hour if anyone wants a couple give me a yell
in the next few minutes.

j

[Hodapp]

This is actually quite a neat component to know about. I had never really thought about something like this existing.

[William Steele]

I've used them before... on great example was on my CNC driver electronics... I use them to set the current limiting on the stepper driver board.  Easier to do with software... and the software can change it when necessary... like for rapid movements, etc.

 

Bill

[William Steele]

I've used them before... one great example was on my CNC driver electronics... I use them to set the current limiting on the stepper driver board.  Easier to do with software... and the software can change it when necessary... like for rapid movements, etc.

 

Bill

[Dave B.]

Digipots are the flip side of the DAC.  I probably have a good number of these around Judas.  I don't remember what part# off the top of my head, but if you tell me what you need I can see if I have it.  Bring your BOM with you tomorrow night.  I'll try to bring all my components down with me.  If you need anything I have, it's yours.  I'm getting to have a lot of common SMT stuff.
-D

On Mon, Mar 11, 2013 at 3:02 PM, William Steele <wjst...@gmail.com> wrote:

I've used them before... one great example was on my CNC driver electronics... I use them to set the current limiting on the stepper driver board.  Easier to do with software... and the software can change it when necessary... like for rapid movements, etc.

 

Bill

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[judas]

Dave,

Except the displays I have already ordered everything I need. But given
the great joy I find in comparing the various types and colors of smoke
I can generate from different electronic components, I might very well
be taking you up on your kind offer at some point in the near future.

j