Hi All,

I've been trying to find a MSP430 with a 16/24 bit sigma delta adc converter, with input buffer, that has 24 or less pins. Everything with the buffer amps seems to have tons of pins for LCD's, etc. What I really want is something like a '2013, or even better, a 'AFE2xx with the buffer amp, but I can't seem to find one.

Am I missing something? If not, why is this? Most of the simple sensor type apps could really benefit from a high impedance A/D...

Thanks,

Kirk Bailey
bailey <@> peak <.> org

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I just went through a similar exercise. I have a fairly complicated motor control product. I need a lot of code space and RAM but not a lot of pins. I ended up with an 80 pin part. It just seems to be how they set up the product line.

Lloyd

--- In m..., "kirkabailey" wrote:
>
> Hi All,
>
...
> Am I missing something? If not, why is this? Most of the simple sensor type apps could really benefit from a high impedance A/D...
...

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You can of course implement a sigma delta converter yourself using
almost any of the smaller parts, provided they have enough memory for
your other apps. The MSP430G2553 looks like a good target, and comes in
the Lunch pad. It depends of course on the sample rates you need and how
efficiently you write your code, but it is quite feasible.

Al

On 29/01/2012 11:22 PM, lslonim2 wrote:
> I just went through a similar exercise. I have a fairly complicated motor control product. I need a lot of code space and RAM but not a lot of pins. I ended up with an 80 pin part. It just seems to be how they set up the product line.
>
> Lloyd
>
> --- In m..., "kirkabailey" wrote:
>> Hi All,
>>
> ...
>> Am I missing something? If not, why is this? Most of the simple sensor type apps could really benefit from a high impedance A/D...
> ...
>
> Start a New Thread

Lloyd and Al,

Thanks for the comments!

I've already contemplated a software adc since my sample rate is pretty slow, so this might be the nudge that justifies the extra code. However, first I need to go dig up the comparator input leakage specs to see what the effective input impedance would be for this approach - probably not worth the effort if I end up still needing an external buffer amp...

Has anyone successfully done this at the 14-16 bit level?

Cheers,

Kirk Bailey
--- In m..., Onestone wrote:
>
> You can of course implement a sigma delta converter yourself using
> almost any of the smaller parts, provided they have enough memory for
> your other apps. The MSP430G2553 looks like a good target, and comes in
> the Lunch pad. It depends of course on the sample rates you need and how
> efficiently you write your code, but it is quite feasible.
>
> Al
>
> On 29/01/2012 11:22 PM, lslonim2 wrote:
> > I just went through a similar exercise. I have a fairly complicated motor control product. I need a lot of code space and RAM but not a lot of pins. I ended up with an 80 pin part. It just seems to be how they set up the product line.
> >
> > Lloyd
> >
> > --- In m..., "kirkabailey" wrote:
> >> Hi All,
> >>
> > ...
> >> Am I missing something? If not, why is this? Most of the simple sensor type apps could really benefit from a high impedance A/D...
> > ...
> >
> >
> >
> >
> >
> >
> >
> > Start a New Thread

Sorry I caught this thread late. You might have a look at the
MSP430F2003/2013.

Regards
-Bill Knight
R O SoftWare

On 1/30/2012 2:25 AM, kirkabailey wrote:
>
> Lloyd and Al,
>
> Thanks for the comments!
>
> I've already contemplated a software adc since my sample rate is pretty slow, so this might be the nudge that justifies the extra code. However, first I need to go dig up the comparator input leakage specs to see what the effective input impedance would be for this approach - probably not worth the effort if I end up still needing an external buffer amp...
>
> Has anyone successfully done this at the 14-16 bit level?
>
> Cheers,
>
> Kirk Bailey
> --- In m..., Onestone wrote:
>> You can of course implement a sigma delta converter yourself using
>> almost any of the smaller parts, provided they have enough memory for
>> your other apps. The MSP430G2553 looks like a good target, and comes in
>> the Lunch pad. It depends of course on the sample rates you need and how
>> efficiently you write your code, but it is quite feasible.
>>
>> Al
>>
>> On 29/01/2012 11:22 PM, lslonim2 wrote:
>>> I just went through a similar exercise. I have a fairly complicated motor control product. I need a lot of code space and RAM but not a lot of pins. I ended up with an 80 pin part. It just seems to be how they set up the product line.
>>>
>>> Lloyd
>>>
>>> --- In m..., "kirkabailey" wrote:
>>>> Hi All,
>>>>
>>> ...
>>>> Am I missing something? If not, why is this? Most of the simple sensor type apps could really benefit from a high impedance A/D...
>>> ...
>>>
>>>

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On 29 January 2012 15:44, Onestone wrote:

> the Lunch pad.

Nice to see I'm not the only one :)
--
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apologise for any failure in my part in trying to make it do the right
thing with post formatting.
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