[hpsdr] A/D

[Philip Covington]

On Thu, Feb 21, 2008 at 2:52 AM, Greg - ZL3IX <zl3ix at inet.net.nz> wrote:
>
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>  Hi Frank,
>
>  Do they say what the signal to noise ratio is?  From that one can work out the effective noise figure, and hence the amount of RF gain needed in front of it.  It is this parameter that limits the BDR in the LTC2208.
>
>  The other biggie, of course is the SFDR.
>
>  73, Greg ZL3IX
>
>  Bob McGwier wrote:
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> FRANCIS CARCIA wrote:
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> ------------------------------------------------------------------------
>
> I was looking through EDN today and saw an ad for the new 160 MHz A/D
> by LTC.
> The bar gets higher....
> ------------------------------------------------------------------------
>
>
>
>  It definitely gets faster. If it is 16 bits then it now admits (160 -
> old_high_bar_sample_rate)/2 more bandwidth noise into the A/D than
> previous versions (assuming a brick wall Nyquist rate low pass filter in
> front of it) and it certainly will cost more..
>
> I know you don't need to be told but others might that higher sample
> rates are good if you need them and not if you don't.
>
> Bob
>
>
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The LTC2209 is a "hot" LTC2208 that has been qualified/tested to be
able to run at 160 MSPS - there is even a 180 MSPS version.

The first LTC2209 engineering samples the Linear sent almost two years
ago me were actually marked LTC2208 ES.

Of course, the problem is generating a 160 or 180 MHz low noise clock.
  If you run the LTC2209 at 130 MSPS it has the same specs as the
LTC2208.

The difference in price between the LTC2208 and LTC2209 is $11 from Linear Tech.

Phil N8VB

 1203592569.0