Dave Caroline wrote: > Analog devices also made f to v's > AD650 goes either way and still in production > > http://www.analog.com/en/analog-to-digital-converters/voltage-to-frequency-converters/ad650/products/product.html > I certainly don't see how you can get bipolar output from this chip, all by itself. it has no direction or sign input. Just Fin. You could connect two of them up to get a difference between the chip handling + and the one doing minus. That is what the L290 did, but it had a matched pair in the same package, so it would presumably remain balanced better.
The reason why you need two sections is because of encoder dither. When the encoder is dithering back and forth across one count, that does not equate to real velocity, no matter how fast it is dithering. Any scheme using a single F/V converter and flipping the sign of the analog output based on the most recent direction would produce a significant output magnitude in response to dither. The dual scheme with difference would rightly produce a near-zero output. Jon ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
