selecting right dsPIC for Complex digital filtering

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Hi, I want to choose a suitable PIC for reading AD7730 24bits delta sigma ADC + internal PGA, for good response it needed Complex digital filtering, I think I should work with dsPIC.
My question is which dsPIC is suitable for this kind of work, which parameter is important for selecting right dsPIC?

Any help would be greatly appreciated.
sincerely yours,
Siyavash.

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there isn't any idea!!?

[Ttelmah]

The problem is that you need to do some thought with much more data.
As your question currently stands it is along the lines of:

"I want a car to do 100mph, what is best".

The real question would depend on so many other factors:

How many people should the car carry?.
Nature of roads?.
etc. etc..

There are probably about forty other factors that would affect the selection.

Typically:
What other peripherals you need?.
How much RAM/ROM?.
How many pins?.
What speed.
'Complex' could mean almost anything...
etc. etc. etc..

As it stands, the question is unanswerable.

Best Wishes