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Christopher Ott
Guest
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 Posted:
Mon Dec 12, 2005 9:35 am Post subject:
Looking for opamps with ability to tolerate input voltage ab |
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I have a board which is currently using several LT1491's, specifically for
their ability to tolerate up to 44 volts above V+ at the inputs. The down
side, is that they are expensive, and frequently out of stock. I'm curious
is anyone out there is familiar with a similar device which might be a bit
cheaper. I'm using this on heavy equipment with a 24v system. Commonly the
LT1491 has a V+ of 5v, however the inputs could momentarily be as high as
28v (due to miswires in electrical assembly).
Any ideas?
Thanks,
Chris
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Tilmann Reh
Guest
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| Posted:
Mon Dec 12, 2005 9:35 am Post subject:
Re: Looking for opamps with ability to tolerate input voltag |
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(setting a Fup2 s.e.c)
Christopher Ott schrieb:
| Quote: | I have a board which is currently using several LT1491's, specifically for
their ability to tolerate up to 44 volts above V+ at the inputs. The down
side, is that they are expensive, and frequently out of stock. I'm curious
is anyone out there is familiar with a similar device which might be a bit
cheaper. I'm using this on heavy equipment with a 24v system. Commonly the
LT1491 has a V+ of 5v, however the inputs could momentarily be as high as
28v (due to miswires in electrical assembly).
|
If the high input voltages are only due to miswires, you might as well
add protection circuitry to a more common, standard OP.
When looking for OPs that accept voltages significantly above V+, they
all are rather esoteric, expensive and/or hard to get.
The good ol' TL072, however, at least accepts input voltages /up to/ V+,
which might be sufficient in some cases.
--
Dipl.-Ing. Tilmann Reh
http://www.autometer.de - Elektronik nach Maß. |
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neon
Joined: 25 Feb 2006
Posts: 595
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Sat Feb 25, 2006 1:49 pm Post subject:
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TRY NATIONAL LM143,343 40V 95 CENTS EACH
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neon
Joined: 25 Feb 2006
Posts: 595
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Sat Feb 25, 2006 1:52 pm Post subject:
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| I REREAD AGAIN why don't you put some attenuator on the input to reduce over stress |
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