Re: Converting +/-50V source to 0-5V via diff amp?



John wrote:
See http://www.maxim-ic.com/appnotes.cfm/appnote_number/1132
and
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1963
and use resistive voltage divider to scale the input down.



Hmm...cool. :-)
But, wouldn't I exceed their voltage ratings (+/-44V) when the
connections were "reversed"?

"Correct polarity" voltages from voltage divider:

50V -----+
|
.-.
| |100K
| |
'-'
+-------- 5V
|
.-.
| |11.1K
| |
'-'
|
0V -----+-------- 0V


"Reversed polarity" voltages from voltage divider:

0V -----+
|
.-.
| |100K
| |
'-'
+-------- 45V
|
.-.
| |11.1K
| |
'-'
|
50V -----+-------- 50V

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Hey- thanks for catching that!- and here after all this time, I still can't even get simple resistor networks right. You're the man- quite quick and clever, very impressed here. I can see you're going to go places. Please tell us how you eventually solve this state of the art problem, We all will be in your debt! Anxiously awaiting your teachings...

.

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