I've pointed my attention to an ADC from Linear-Technology, the LTC2208, high speed - 16Bit - 130Msps and SFDR=100dB.
Actually I'm evaluating (by simulation) the total performance of two different architectures.
One uses mixers on the front of the ADC to downconvert the input signals, and the second delivers the imput signals directly to a VGA followed by the ADC and a subsequent DDC.
Anyway we can't go around a programmable RF input bandpass filter stage (for now).
I'm just brainstorming on the solder technology to use. LFCSP and BGA packages are on the list as TSOP and more SMDs, so this will be a very actual argument for me.
I've got a little electric oven to backe the PCBs.
Some experimenting on the use of such method have been very positive.
Else if a bit off topic I'll encourage to change impressions on this argument.
vy 73s de Andreas - ik2wqi
mdgolfbum wrote:
> This will be my first attempt using the DDS chips in my "own"
> design. Obviously I'm borrowing from everywhere I can. From what I
> understand the 9958, 9959 are better even with their 10bit vs 14bit
> DACs. I'm going on faith...
>
> BTW, take note of the release date of the datasheet. I was fooled by
> looking only at the rev level. The 9958, 9959 are from late 2005 vs
> 2003 or so for some of the other chips.
>
> As far as soldering goes, I don't think AD will go backwards to fine
> pitch leads so it looks like learning to solder the LFCSP is the
> only way to stay up with the latest and greatest.
>
> The conductor does wrap around the side a bit. My first attempt will
> be to do the soldering pin by pin to that area. If necessary I'll
> try the paste and oven approach. I've got an oven I bought just for
> SMD work but haven't yet tried it.
>
> It's only money...
>
> 73
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