RF ADC

[wb4jfi at knology.net]

Andre, I have to disagree.  Many, many years ago, I designed something 
important for work around a National Semi IC, using a spec sheet that 
appeared 100% a legit product.  I kept hearing that it would be available 
Real Soon Now, but was not available Right Now.  Eventually, I was told that 
the part would not be made, and that the spec sheet was in fact just a 
"feeler" to see if there was market interest in that product.  Never mind 
that the spec sheet did not say "preliminary", "potential product" or any 
other term to indicate its vaporware nature.  This actually happened more 
than once, but I had been forewarned.

To this day, I avoid Nat Semi parts whenever possible, except for voltage 
regulators and other meaningless items that I can second-source.  I will NOT 
use Nat Semi exclusive ICs of any complicated nature if I can help it.  I 
will design AWAY from Nat Semi.  I never even consider their A/D or D/A 
devices.

I would not trust an Nat Semi product announcement unless I found the part 
listed as IN STOCK at Digikey.  Even then, I would prefer another vendor, as 
it might become discontinued before I received my Digikey order.

And, I think Nat Semi is playing fast and loose with the specs on this chip. 
Never let reality get in the way of a good product announcement.  If 
something seems too good to be true....
Terry


-----Original Message----- 
From: Andre Kesteloot
Sent: Friday, July 29, 2011 3:43 PM
To: tacos at amrad.org
Subject: Re: RF ADC

On 7/29/2011 13:36 PM, Martin wrote:
> http://www.national.com/pf/AD/ADC12D1800RF.html#Overview
>
> So - how National is about vaporware?   If it does show up - how 
> expensive?
>
> Cheers,
>
> Martin
> KB3UJQ

Martin,

Traditionally, National Semi has not been about vaporware. The spec
sheet (the above link appears to be broken)

http://www.national.com/ds/DC/ADC12D1800RF.pdf   depicts an apparently
well-tested IC.

The problem, for the likes of you and me, won't necessarily be te price,
but that its implementation will be practically impossible: look at the
pin-out :-(

73
André N4ICK
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