[hpsdr] Mercury: LTC2209

[Philip Covington]

Hello,  see answers below:

On 4/20/07, Henry Vredegoor <henry.vredegoor at gmail.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
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> Hi Phil & Phil, All,
>
> Sorry to bug you again Phil....
>
> Reading the webpage, you mention the LTC2209 (=LTC2208 170 MSPS ).
> Searching the Linear website, I couldn't find any reference to it, only one
> reference in a PDF of an evaluation board.
> Do you know if they still (or not yet) sell it or if they dropped it?

I don't know what the status of the LTC2209 is.  I have an engineering sample.

> If it would be still available, it would be a direct "drop in" replacement
> (pin compatible) for the LCT2208?
>
> Another question would be: Why did you switch from 2 ADC's (as mentioned in
> the Mercury calculation text) to one?

I am not aware that there were any plans to use two ADCs.

> Would have been nice to have a 170 MHz (2 X LCT2209) Mercury up to /
> including  2 meter !!!???  ;-)
> Or would this be impossible due to lack of processing power in the FPGA?

It has nothing to do with the FPGA.  While it is possible, it would
double the cost of the board because of the additional clocking issues
you'd have to deal with not to mention that the LTC2208 is the single
most expensive part on the board at almost $100 each.

It is not trivial to come up with a clock generation and distribution
scheme to drive two LTC2209 ADCs.

> Hope I didn't miss this in the archives.....
>
> 73's,
>
> Henry.

Phil N8VB

 1177074528.0