+/- 10V to +5V Conversion
Started by ●October 3, 2005
Reply by ●October 4, 20052005-10-04
Insert "NOT" in the appropriate place.
neil Don Kinzer wrote:
> variations in the current flowing through the upper divider do disturb
> the offset voltage (very much). >
>
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Reply by ●October 4, 20052005-10-04
--- In basicx@basi..., Jepsen Electronics Ltd <njepsen@i...>
wrote:
> Insert "NOT" in the appropriate place.
Indeed. It should have read:
... so that variations in the current flowing through the upper
divider do *not* disturb the offset voltage (very much).
wrote:
> Insert "NOT" in the appropriate place.
Indeed. It should have read:
... so that variations in the current flowing through the upper
divider do *not* disturb the offset voltage (very much).
Reply by ●October 4, 20052005-10-04
At 11:10 PM 10/3/2005, you wrote:
>--- In basicx@basi..., Ken Arck <ah6le@a...> wrote:
> > Call me dumb but how does a voltage divider protect the BX's input
> > from a negative voltage?<...>
A great deal of thanks to Don, Lauren, Neil and others for the quick
response to my question. It never ceases to amaze how much you guys
know and how willing you are to share it.
Thanks, again,
Paul
"I've seen the future, and you're not going to like it."
-- Vincent van Gui
>--- In basicx@basi..., Ken Arck <ah6le@a...> wrote:
> > Call me dumb but how does a voltage divider protect the BX's input
> > from a negative voltage?<...>
A great deal of thanks to Don, Lauren, Neil and others for the quick
response to my question. It never ceases to amaze how much you guys
know and how willing you are to share it.
Thanks, again,
Paul
"I've seen the future, and you're not going to like it."
-- Vincent van Gui
Reply by ●October 5, 20052005-10-05
I like the resistor divider, combined with a "summer" for its
simplicity.
I was going to offer the possibility of a divider circuit feeding a
rail-to-rail op-amp. I think you can get one which operate with
single-sided power supplies (or you can use an extra 2.5v reference
(is it called a phantom ground, or something like that?))
As a non-expert, and knowing only enough to get myself into trouble,
_I_ would try to come up with an op-amp solution.
What bandwidth do you need? Analog or Digital? As I said, I am no
expert, but I have heard that the divider networks have problems
with bandwidth. Presumably due to capacitance?
For digital purposes, you could consider a level shifter IC. I am
using one in my SD card interface project. Dividers would work,
except for possible bandwidth, in the conversion from high voltage
to low voltage. Not quite so easy in the low-to-high conversion.
Some people rely on the fact that +3v or +3.3v is considered "high"
in most 5v digital systems. Unless, of course, it doesn't work the
way it should.
-Tony
simplicity.
I was going to offer the possibility of a divider circuit feeding a
rail-to-rail op-amp. I think you can get one which operate with
single-sided power supplies (or you can use an extra 2.5v reference
(is it called a phantom ground, or something like that?))
As a non-expert, and knowing only enough to get myself into trouble,
_I_ would try to come up with an op-amp solution.
What bandwidth do you need? Analog or Digital? As I said, I am no
expert, but I have heard that the divider networks have problems
with bandwidth. Presumably due to capacitance?
For digital purposes, you could consider a level shifter IC. I am
using one in my SD card interface project. Dividers would work,
except for possible bandwidth, in the conversion from high voltage
to low voltage. Not quite so easy in the low-to-high conversion.
Some people rely on the fact that +3v or +3.3v is considered "high"
in most 5v digital systems. Unless, of course, it doesn't work the
way it should.
-Tony
