Simple 8-bit FFT Processor for 512pt Array at 20MHz

[Ravaner]

Hello. I'm looking for a "simple" FFT processor able to process an 8 bits input in an array of at least 512 pts with a speed of at least 20 MHz. I've precised "simple" instead of certain TI DSP with up to 196 pins ! I only need FFT nothing else. Does it exist ? Thanks by advance for replies.

 

[Windadct]

Tough to answer without checking the DS of a bunch of processors - Digikey sort may help

Do you just want the processor - for a product development, or is this a one off build - although a Dev Kit would help with both.

 

[berkeman]

Hello. I'm looking for a "simple" FFT processor able to process an 8 bits input in an array of at least 512 pts with a speed of at least 20 MHz. I've precised "simple" instead of certain TI DSP with up to 196 pins ! I only need FFT nothing else. Does it exist ? Thanks by advance for replies.

Does that mean you want to process the whole array from input time domain data to output frequency domain data once every 1/20MHz = 50ns? That's pretty fast for a simple processor, IMO. There may be some purpose-built chips that can be used to pipeline and accelerate the transform, though.

EDIT -- Or do you mean you just want your hardware clock for this processing to run at 20MHz? How often do you need for the FFT to complete?

 

[berkeman]

Here's a Google search of FFT Processor 8-bit, giving several useful hits that you may want to read through...

https://www.google.com/search?q=fft+processor&ie=utf-8&oe=utf-8#q=fft+processor+8-bit

 

[Baluncore]

8 bits input in an array of at least 512 pts with a speed of at least 20 MHz.

If the 20MHz is the data acquisition rate, then it can be done continuously on an Intel CPU in a PC.
There is code available for FPGAs that will generate pipelined parallel FFT processors for the highest speeds.

 

[Ravaner]

Thanks for your replies.