Hi Jon,
Those are hot chips... don't know how many resolvers there are out
that will handle the reference freq tho ... but not many apps will
push the rps spec. ;-)
http://www.analog.com/en/subCat/0,2879,760%5F791%5F0%5F%5F0%5F,00.html
Dave
On Aug 3, 2007, at 9:03 PM, Jon Elson wrote:
Mark Pictor wrote:
The nice thing about resolvers is that they are very rugged -
with no
electronics in the resolver itself, they can handle high
temperatures,
coolant, and other abuse that would kill an optical encoder in
short
order. The bad thing about resolvers is that the circuitry to
generate
the sine wave reference and interpret the resulting signals is
usually
complex and expensive.
And could now be put in one IC.
Ahhh, but they are still big bucks... somebody was selling surplus
R/D chips on ebay a couple months ago for $350/each.
They used to be expensive. But, Analog Devices recently came
out with the next generation of this, the AD2S1200, $18 in
single quantity from Digi-Key. It not only generates absolute
position, but it puts out a simulated quadrature signal.
Jon
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