Re: [casper] KatADC

Wed, 29 Feb 2012 05:55:33 -0800 

Thanks Etienne.


On Wed, 29 Feb 2012, Etienne Bauermeister wrote:


Hi Matt,
The 2/4 Gsps version of the KatADC is based on an engineering sample they gave us of a future 2/4 Gsps ADC that is based on the current 1.5/3 Gsps ADC - I think it is just an up-sampled version of the latter. The indication from them was that this will be a future product that would be available in a few months, but shortly thereafter Texas Instrument bought out National Semiconductor and all future ADC development seemed to be put on hold while they reorganized. Subsequently I was informed that if there is a need for the part we must ask for it from our local suppliers. The bottom line is that if enough people ask for it then it might become available, otherwise I won't bank on it becoming a standard product anytime soon.The bottom line is that if enough people ask for it then it might become available, otherwise I won't bank on it becoming a standard product anytime soon as other future ADC products that they indicated to us would be available has been put on hold as well (indefinitely). 

Regards
Etienne

On 2/29/2012 9:04 AM, Francois Kapp wrote:

Hi Matt,

As far as we know the part has not been released commercially.  I
suspect if it has not happened by now, it is unlikely to happen.

Regards,
Francois

On Wed, Feb 29, 2012 at 5:11 AM, Matt Dexter
<[email protected] <mailto:[email protected]>> wrote:

    Hi all,

    Is there any news w/ regard to the  4 GSPS version of the
    KatADC using the uptested Natl Semi S7002396 ADC IC ?

    Are people using them with Roach2 or other hosts ?
    Cost ?

    Thanks,
    Matt

    On Wed, 1 Jun 2011, Dan Werthimer wrote:



        hi tom,


        regarding pushing the KatADC from 2*1.5 Gsps to 4 Gsps:

        it will be difficult, perhaps impossible, to
        move 4 Gsps 8 bit ADC data through a single zdoc connector
        into roach I.  each of the 32 bit lvds lanes would
        have to operate at 1 Gbit/sec, and we've never
        tried that on Roach I.    the most we've achieved
        is 750 Gbit/sec per LVDS pair (using the 3 Gsps ADC board).

        we've interleaved a pair of these 3 Gsps ADC's to
        get 6 Gsps, using both ZDOC connectors on roach I.

        on roach II, it should be possible to input 1Gb/sec
        on each LVDS pair (you'd probably want to clock the FPGA
        at 500 MHz and use DDR inputs), and then you
        could get a 4 Gsps 8 bit ADC on each ZDOC connector.

        best wishes,

        dan






        On 06/01/2011 12:11 PM, Francois Kapp wrote:

            Hi Tom,

            The 4GSPS version of KatADC is based on an "up-tested"
            version of the
            ADC08D1520, which is designated S7002396.  It is unclear
            whether this
            will be released as a commercial product by National - a few
            inquiries
            to them couldn't hurt the cause.  So far we have only
            received the
            one.  The rest of the board is the same as the wide-band
            front-end
            KatADC version, which is the standard version that Mo builds
            (i.e.
            with BOM:
            
http://casper.berkeley.edu/__wiki/images/7/71/KATADC1.3BOM___HF_Build.pdf
            
<http://casper.berkeley.edu/wiki/images/7/71/KATADC1.3BOM_HF_Build.pdf>).

            If you can extract a chip from National it should be a
            simple matter
            to get one built.

            Regards,
            Francois

            On Wed, Jun 1, 2011 at 8:26 PM, Tom
Kuiper<[email protected] <mailto:[email protected]>> wrote: 

                On 06/01/2011 11:19 AM, John Ford wrote:


                        I'd like to know more about this ADC on the
                        hardware wiki page under
                        KatADC:

                        Dual 8-bit 2.0GSPS (or Single 8-bit 4.0GSPS),
                        National Semiconductor
                        ADC08D1520/S7002396 ADC, RF Front-End

                        However, the KatADC page doesn't seem to have
                        any information about it.
                        Can someone direct me to or send me information
                        about this?


                    Hi Tom.  The data sheet's linked here:

                    http://www.national.com/ds/DC/__ADC08D1520.pdf
                    <http://www.national.com/ds/DC/ADC08D1520.pdf>


                That's the original 3 Gsamp/s version.  I was asking
                about the 4 Gsamp/s
                version (see the /S7002396?).  This data sheet probably
                predates the newer
                version.

                Cheers

                Tom


                    From

                    https://casper.berkeley.edu/__wiki/KatADC
                    <https://casper.berkeley.edu/wiki/KatADC>

                    John



                        Many thanks,

                        Tom

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Etienne Bauermeister
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