Hi Matthew --
--- In Matthew Harrell
<> wrote:
>
> >> General requirements
> >> need to be able to capture 3 or 4 simultaneous readings
> >> 12 bit resolution or more would be nice
> >> want to take readings from the ADC about every 10 microseconds
> >> would prefer an interrupt based system over polling
> >
> > err... interrupt every 10usec? That's 100,000 Interrupts per sec. My
> > experience with the ts7200 leaves me to think that the max
interrupt rate
> > is more like 10,000 per sec. I think you'd need hardware that can
do the
> > timing and sampling, stuffing the samples into a buffer.
>
> Actually more what I meant is that the ADC could take a sample on each
> channel every 10 microseconds, store it in a FIFO of, say 256 per
channel,
> and then generate an interrupt when the FIFO is full. Does that sound
> more reasonable?
I think that both the ADC-16 and ADC-24 hardware will do that, they
both have a 512 sample fifo. Looks like you can do two simultaneous
samples on the ADC-16, and four on the ADC-24. External triggering is
only available on the ADC-16 though, if your app needs it.
But the only software I've seen for those TS boards is a shell
library, kind of a proof-of-concept, test-the-hardware thing, although
the TS website says a driver is available. I think the HW can do what
you want; it's a question of getting software to fully exercise the
board. If you roll your own (as I guess you do, being a bit-twiddler
:), no problem.
I'd read through the ADC data sheets (LTC1859 and AD7266) to see if
either would work for you.
regards, .......... Charlie
>
> --
> Matthew Harrell
> Bit Twiddlers, Inc.
>
>
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