Re: Dedicated mb for PID

Jon, what are you using for DACs? Did you implement a delta sigma in
the FPGA/CPLD with external op-amp filtering?

Best Regards,

~petev

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> vavaroutsos wrote:
>
> > Jon, what FPGA did you have in mind? I haven't looked at all the
> > latest and greates, but I don't know of any that have on board
DACs
> > or differential line receivers. Did you intednd to use an FPGA for
> > bus interface, quadrature decoding, and general purpose I/O (gpio)
> > with external DACs, opto isolators, and line receivers?
> >
> > I think this will cost more than $30. If enough people are
interested
> > in designing a low cost servo interface card like this, I'll
> > volunteer for schematics and FPGA code. Now all we need is PCB
> > layout/fab, parts, assembly, and software support in EMC.
>
> I use a Xilinx XC9572 in my DAC and DIO boards, and the XCS30
> in the universal stepper board. I use the XCS10 in the PPMC encoder
> counter board. The XCS10 is about $18, the XCS30 is $30, and the
> XC9572 is only $6!
>
> I have the Xilinx software and a pretty expensive PCB package.
> I'm also getting quite familiar with EMC internals.
>
> Jon