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On Thu, Mar 4, 2010 at 1:08 PM, Mark Rages <markrages@gmail.com> wrote:
>> That being said, it is a nice MCU family. I even considered to use it
>> for a project once, only to find out poor documentation about the
>> 16bit Sigma-Delta ADC and the true performance of the 16bit
>> Sigma-Delta is actually quite poor. TI admitted the document
>> deficiency at that time.
>
> I am actually looking at the SD16 ADC for a project right now. =A0What
> performance problem did you have with it? =A0Maybe I should plan to use
> an external ADC.

I was looking at the SD16 unit inside the small F2013 parts. The
speed is a bit slow, the effective bits are even worse at the
speed we want. So we used an external ADC instead.
Our requirement was on the high side (1200Hz conversion
rate with true 12bit RMS, 600Hz with true 16bit RMS),
so we were only looking at F2013 very briefly and decided it is
not good enough. Actually none of the integrated ADC would
fulfill our requirements (there are other requirements as well),
not even the ADI uConverter or TI precision MCU or Silicon
Labs MCU.

At the time the literature (SLAU144B) for the SD-16 was
horribly wrong. It seems they corrected the literature in
SLAU144E version.

You can compared the formula I got in SLAU144B
and the new version.

New version: SLAU144E Section 24.2.6.
http://focus.ti.com/lit/ug/slau144e/slau144e.pdf

The formula of SLAU144B is attached.

--=20
Xiaofan http://mcuee.blogspot.com

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