RE: [CAD_CAM_EDM_DRO] Re:Inductosyn DRO was balls

You might want to look at the Atmel line of microcontrollers. There are
several asm, c, and BASIC compilers around, some free. In particular,
the AT90S8535 has 8 A/D channels, as well as a serial port and other
nifty I/O. Plus they can be programmed in circuit. The Mega line has
even more features.

www.atmel.com

Regards,
JJ

Be Kind, Be Careful, Be Yourself

> -----Original Message-----
> From: Keith Bowers [mailto:kabowers@...]
> Sent: Thursday, October 31, 2002 11:21 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re:Inductosyn DRO was balls
>
>
> On Wednesday 30 October 2002 22:53, Bill Higdon wrote:
> > Keith Bowers wrote:
> > >>>http://products.analog.com/products/info.asp?product=AD2S90
> > >>>AD2S90-EB PRODUCTION Evaluation Boards - COMMERCIAL $89.06
> > >>>AD2S90AP PRODUCTION PLASTIC LEAD CHIP CARRIER 20
> COMMERCIAL $29.16
> > >
> > >-------
> > >I expect to need a 2-axis resolver to quadrature board, so
> I did a bit
> > > more checking.
> > >
> > >The evaluation board price above is quantity 1.
> > >
> > >Unfortunately the above price for the chip is quantity 100
> and is not
> > >available for online purchase from Analog Devices WEB site.
> > >
> > >Pioneer has ad2s90ap in stock with the quantity 1 price as
> $44.86. You
> > >probably want an ad2s99 reference oscillator @$10.73 too,
> but out of
> > > stock.
> > >
> > >At a guess a 2-axis board with just quadrature output
> could probably be
> > > hand wired for around $125 with all new parts.
> > >
> > >More thinking is in order; such as serial out to a computer.
> >
> > I have looked at these, and someone finally got smart! The
> cost for a
> > 12 bit board back in 99 was very high. It took 2 8 bit
> converter chips,
> > a special chip to add their outputs together, and a high
> priced osc. The
> > 8 bit chips were on the order of $300.00 each as I remember, and the
> > adder was about the same.
> > Bill Higdon
> >
> >
> >
> Another thing I have been contemplating is the Maxim
> MAX157/159 10/20 bit A/Ds
> along with something like a DS89C420 (33 MHz clock) or maybe
> the Basic-X
> stuff to do the arithmetic, but I haven't come up with a
> simple way to read
> two signals at the same time since the samples must be
> perfectly synchronized
> to the peak of the reference signal. By the time you add a
> sample and hold
> chip in front and then read each sample things start to get
> complicated.
>
> A really interesting solution would be the one TI has in a
> TMS324F240 DSP
> application note. The approach could be really interesting if it was
> completed. They don't appear to publish complete code for
> what they do and do
> not include quadrature output in the design. The code for one
> axis, including
> reference signal generation, used less than 25% of the
> processor, so it would
> appear that a 2-axis board might be hand wired for about $50.
> As usual TI
> wants a bundle for the associated compiler, but there is a
> GNU version at the
> usual price 8o). One would also have to come up with a way
> to burn the
> program into a chip. I have never gotten into DSP and would
> really prefer to
> make chips with machine tools.
>
> The more I write, the better the AD2S90s look <g>.
> --
> Keith Bowers - Thomasville, NC
>
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