2Mhz differential ADC input with hardware FFT options

Carl, 

I received the inquiry today and just read the description. Could you confirm functions to be supported by the processor SOC:

1. Require integrated ADC to the processor SOC?

2. Require smart FFT functions

3. Require graphical display of spectrum statistics?

Thanks

Jian

1. Yes, we would prefer differential 12bit ADC that can sample at 2Mhz+, it could be external, however it would need to have a total BOM cost around USD$20 with ADC and processor. Our front end is differntial interface.

2. Not 100% but it the unit will do mostly FFT's so it will be optimal to have hardware FFT. We may be doing 1024/2048point FFT on the 2Mhz sample data with 50% ooverlapd, we may also want to do 64 point FFT on the same data etc

3. No graphics required.

Happy to arrange call if easier. I think the details are all in the orginal post of the minimum specification but happy to supply as much information as you need so we can select a solution that meets the cost requirments and processing requirments.

Also, I think we will also be sampling IQ which will require two differential ADC inputs both sampes at 2Mhz.

Hi,

I have been trying to work on some options and have found that it is not likely that we will be able to use the internal ADC on the processors from TI (or anyone).

We are sampling IQ and require simultaneous sampled ADC. So we are trying to also find a single ended or diff ADC that will do 16 effective bits @ 250Khz or so.

We would then likely use an SPI interface into the processor to get the sample data and perform hardware FFT’s in the processor.

Can you please help us select at least the processor that would allow us to do FFT (IQ sampled) at a reasonable speed (2 channels sampled at 1Mhz).

If you could help finding an ADC that can do >= 16 effective bits simaltaneously sampled that would be great (must be SAR ADC with SPI or other high speed serial to get the data into the processor).

Hi,

For the ADC, we could do 1M sampling. we really need to get closer to 16 effective bits and it must be able to simaultanous sampling (IQ sampling)

Thanks for your help, we also narrowed it down to the ADS9224R which has a perfect development board the ADS9224REVM-PDK has a reference design for everything we need behind our matching / front end.

How do I find more information about the Precision Host Interface (PHI) on the ADS9224REVM-PDK? I have been searching for a couple of hours with no luck.

For a prototype we can probably make out own dev board and use the Precision Host Interface (PHI) if we can find some more information on it. Like an API so we can talk directly to it, some details on the EEPROM on the host board (can we just put a blank on one our own board and program it with the Precision Host Interface (PHI) board / software? I have not been able to find much in the way of details of the board, how it works, and what i can do with it. It would be perfect for first cut of our prototype as it appears to have all the functions we need for a "quick test". If we could get those PHI to output some other signals it would be absolutely ideal i.e. if we can get a couple of outputs to clock at preset rates and talk to another SPI device, even without that, if we can just use it to read our own ADC board that would be great.