I found an L290 datasheet. I can see why it would be discontinued. It has low performance, up to only 20 kHz. Also, most current microcontrollers have this function on-chip now. Quadrature decoding is so commonly used. https://www.digchip.com/datasheets/parts/datasheet/456/L290-pdf.php
It must be old as the sheet talks about using this in "daisy wheel typewriters" On Mon, Dec 7, 2020 at 9:52 AM John Dammeyer <jo...@autoartisans.com> wrote: > > From: Jon Elson [mailto:el...@pico-systems.com] > > > > > > You can also get dedicated quadrature to tach converters > > (although they are kind of expensive) > > that could have as much bandwidth as you want. I've been > > thinking about making this one of my products for quite some > > time. TOO BAD they discontinued the L290 chip, which did it > > all. > > > > Jon > > Googling L290 with Counter or Quadrature doesn't yield anything. Got any > more details? > > I have an LS7266R1 which is a 24 bit dual axis quadrature interface and 3 > LS7066 from an old project used to track drilling rig heave on floating > platforms. We'd track the distance to a weight on the ocean floor by > counting revolutions of the pulley wheel and the distance the drill string > was lowered by the encoder on the drill string cable. The difference > between the two counts was used to adjust the drill string cable so the > weight on the drill was maintained regardless of ocean conditions. Boy > that was a long time ago... > > Joh Dammeyer > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
