--- In "Michael" <> wrote:
>
> > > Looking at the TS-7250 schematic, it seems there isn't any
external
> > > capacitance. The datasheet (as I'm sure you've seen) suggests
4.7uF
> > > at REF (pin26) and .01uF at REFADJ. Schematic shows .1 and 4.7uF
> > > on REFADJ.
> >
> > Yes , I'd looked into that. I actually think this is a TS
> > documentation error since there is a capacitor on pin 26 , but
since
> > it is a microscopic smc device I can't tell its value. It seems
too
> > small to be a 4.7uF though!
>
> I've forwarded this report to our hardware engineer and indeed
there was a
> documentation error. To summarize their response, "the MAX197 ADC
does have
> a 4.7 uF cap on its pin 26." The TS7250 schematic available on the
web site
> has been updated with this correction.
>
>
> ______ Best Regards,
> |__ __/ Michael Schmidt
> || Software Engineer
> ||echnologic Systems (EmbeddedARM.com)
> || (480) 16610 East Laser Drive #10
> |/ 837-5200 Fountain Hills, AZ 85268
> http://oz.embeddedarm.com/~michael
>
Thanks Micheal,
that should help in the future.
Could you address my main issue here? Is it realistic to try to get
12 bit accuracy off these boards (within the limits stated in the
MAX197 datasheet) or are we expecting too much?
I'm quite willing to believe this noise may be coming from the
external cct but don't want to spends days/weeks fault finding only
to discover that I am trying to achieve the impossible.
To be clear , I'm not refering to absolute accuracy here. Just
whether it is possible to get a clean reading +/- 1 LSB while
sampling just one channel.
I need to make a decision very soon now on whether these boards are
able to fullfil our spec requirements.
Thanks for any information your engineers can provide.
best regard,
jacques.
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