Maxim MAX153 half-flash fast A/D on my workbench computer

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Garth
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Maxim MAX153 half-flash fast A/D on my workbench computer

Post by Garth » Fri Jan 18, 2013 8:51 pm

http://wilsonminesco.com/6502primer/potpourri.html#ADC

IIRC, it's fast enough to just read it like a memory location if you had a bus of only 1MHz. I'm running at 5MHz, so I have the A/D on a 65c22's port.

I have a couple of web pages a bout the workbench computer at http://wilsonminesco.com/BenchCPU/ .
http://WilsonMinesCo.com/ lots of 6502 resources

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brad
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Re: Maxim MAX153 half-flash fast A/D on my workbench compute

Post by brad » Sat Jan 19, 2013 7:51 am

Now that is quite fast!

I've never heard of a half flash before, does this just let it improve on speed while not costing as much as a full flash ADC?

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Re: Maxim MAX153 half-flash fast A/D on my workbench compute

Post by Garth » Sat Jan 19, 2013 8:18 am

Right. A flash converter requires a lot more analog comparators. An 8-bit half-flash converter does the first four bits all at once and then the next four all at once. I'm not sure I've seen any 8-bit (full)flash ones, although I'm sure they exist. I know I've seen 6-bit ones. There are so many thousands of A/D converters on the market that it's not possible to be familiar with a significant percentage of them. The nice thing about this converter is that you don't have to tell it to start a conversion and then come back later when it's finally done, or shift bits in one at a time while it's doing the conversion.
http://WilsonMinesCo.com/ lots of 6502 resources

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Re: Maxim MAX153 half-flash fast A/D on my workbench compute

Post by brad » Sat Jan 19, 2013 8:42 pm

The only ones I've ever used are the ones were you have to tell it to start the conversion.

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