Re: [TSCM-L] {4839} Seeking A/D Converter Recommendations
James M. Atkinson wrote:
> I figured I would query the list to see if anybody has suggestions.
>
> I am working on a design project that requires me to sample an
> unstable analog signal with 16 bits in parallel, at a rate of 350 MSPs
> or greater. The analog input signal must be 175 MHz wide, so I need to
> sample at twice this rate. I also need the sixteen bits, and would
> prefer to get a two stage AD convertor where there are two of more
> bits that indicate it the signal is saturated and if so, by how much
> (so that attenuators and filters be applied), and two of more bits
> dedicated to the noise to control and gain amps in addition to the 16
> bits of data that I need. Ideally a 20-24 bit AD would be great, but I
> am willing to do the noise detection and saturation detection via a
> dedicated circuit and just use the 16 bits for the data.
>
> Heat is critical as I need these to be cool when at the full sampling
> speed or it is doing to screw up the lower level signals. I have to
> run them in the same chassis as several of there brethren, along with
> some FPGA's so heat is not my friend right now.
>
> The A/D converter will be for use in a ultra-long FFT engine to
> digitize 175 MHz blocks of the spectrum in real time (no sweep, but
> real time), with 16 A/D circuits on a single daughter board for 2.8
> GHz coverage on a single very small board. I am using a FPGA on the
> digital side of the chip to perform the FFT butterflies, and then
> merging the 16 sets of data into a single very large real-time
> spectrum data file and digitizing 256 bits in parallel for huge chunks
> of the spectrum.
>
> I am seeking a surface mount A/D chip, and would prefer a chip that
> is U.S. made, but would consider a foreign made chip so long as it is
> available through major U.S. based supply houses without a lot of
> import/export hassles. Would prefer a military or avionics grade A/D
> convertor.
>
> Any suggestions woudl be appreciated.
>
> -jma
>
>
Received on Sat Mar 02 2024 - 00:57:17 CST
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