Can You Find Affordable DSPs Capable of 16 MHz ADC and 512-Point FFT?

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Discussion Overview

The discussion centers around finding affordable digital signal processors (DSPs) that can perform analog-to-digital conversion (ADC) at a minimum of 16 MHz and execute a 512-point fast Fourier transform (FFT). The scope includes technical specifications, potential solutions, and manufacturer references.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the bit depth of the samples and whether real-time FFT processing is required.
  • Another participant suggests that the desired DSPs may not be marketed to hobbyists due to the complexity and support requirements, mentioning Infineon TriCore parts as a potential solution but noting the high cost of evaluation boards.
  • A different approach is proposed to combine an ADC with a low-cost BlackFin DSP, indicating a possible solution involving multiple components.
  • Microchip's dsPIC range is highlighted as a viable option, featuring built-in ADCs capable of interleaving to achieve the desired sample rate, with low-cost development systems available. The participant notes the need to integrate FFT code with the ADC functionality.

Areas of Agreement / Disagreement

Participants express various viewpoints on potential solutions, but no consensus is reached regarding a single affordable DSP that meets all specified criteria. Multiple competing solutions and approaches are discussed.

Contextual Notes

There are limitations regarding the specific requirements for the project, such as the need for real-time processing and the bit depth of samples, which remain unclear. Additionally, the availability and reprogrammability of certain components are not fully resolved.

Who May Find This Useful

This discussion may be useful for hobbyists, engineers, or students interested in digital signal processing, particularly those seeking affordable hardware solutions for ADC and FFT applications.

Ravaner
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Hello. I've searched without any real success on the web. I'm looking for a DSP (at affordable price !) which is able to accomplish ADC fonction (at least @ 16 MHz) and FFT on at least 512 points panel. If someone can transmit some manufacturer references ... Thanks by advance.
 
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How many bits per sample? Do you have any microcontroller (uC) or other processing devices already? Do you need the FFT to be done in about real time?
 
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I assume you are looking for something under $100.
And the 16MHz is the sample rate of the ADC.

I think the problem is that nobody markets that to hobbyists because they require too much support.
There are Infineon TriCore parts that fit your bill, but the evaluation boards are $5K.

These parts are sometimes used in consumer goods - but even if you took apart an auto radar sensor, the part inside may not be reprogrammable.
 
As @berkeman suggests, your solution might be to put together a few parts: 1st an ADC, then pipe that into a $20 BlackFin DSP.
 
Thanks for replies
 
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Microchip make the dsPIC range of 32 bit signal processors. They have several 4Msps 12 bit AtoD converters in the chip that can be interleaved to get 16Msps. Processor clock speeds are up to 100MHz, with prices less than $10. Low cost development systems are available. You may need to use an FFT from their code library. I would interlace the FFT code with the AtoD.
http://www.microchip.com/paramchartsearch/chart.aspx?branchID=8097

It would help if we knew what project you were planning.
 
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