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<DIV>Hi Larry,</DIV>
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<DIV>I confirm that the LTC2209 is a drop-in replacement for the 2208 and runs
fine at a higher clock frequency since I have one installed on a Mercury
board.</DIV>
<DIV> </DIV>
<DIV>The NF of the LTC2208 is about 30 dB (as long as you don’t follow the
data sheet and resistively terminate the input) so is usable up to about 17 m
without a preamp when connected to an efficient antenna. </DIV>
<DIV> </DIV>
<DIV>73 Phil....VK6APH </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=lgadallah@gmail.com
href="mailto:lgadallah@gmail.com">Larry Gadallah</A> </DIV>
<DIV><B>Sent:</B> Friday, July 27, 2012 11:36 AM</DIV>
<DIV><B>To:</B> <A title=irbsurfing@yahoo.co.uk
href="mailto:irbsurfing@yahoo.co.uk">Andrew</A> </DIV>
<DIV><B>Cc:</B> <A title=hpsdr@lists.openhpsdr.org
href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</A> </DIV>
<DIV><B>Subject:</B> Re: [hpsdr] ADC Question</DIV></DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">*****
High Performance Software Defined Radio Discussion List *****<BR><BR>
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Hi Andrew:<BR><BR>
<DIV class=gmail_quote>On 26 July 2012 13:46, Andrew <SPAN dir=ltr><<A
href="mailto:irbsurfing@yahoo.co.uk"
target=_blank>irbsurfing@yahoo.co.uk</A>></SPAN> wrote:<BR>
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<DIV class=HOEnZb>
<DIV class=h5>***** High Performance Software Defined Radio Discussion List
*****<BR><BR></DIV></DIV>
<DIV> </DIV>
<DIV>
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<DIV>Hi Larry,</DIV>
<DIV>Unfortunately the LTC2207 and LTC2208 are not pin compatible, the former
is 48 pin QFN and the latter a 64 pin due to the use of LVDS for the output
data lines.</DIV></DIV></DIV></BLOCKQUOTE>
<DIV> </DIV>
<DIV>Hmmm, I must have confused it with the LTC2209. Regardless, the point is
that it would be interesting to experiment with an HF-only arrangement where an
ADC with the absolute best ENOB and SFDR was used in an attempt to get a bit
closer to analog Rx performance without needing a preamp. From my casual
research it doesn't look like anyone (TI, LTC, ADC) has anything much more than
2-3 dB better than the LTC2208, so it seems that this might be a
process/technology limitation.</DIV>
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<DIV>I had already thought about doing this! Trying to make it fit would be
very interesting and not recommended without a specially designed pcb carrier
- that just might work.....mmm.<BR></DIV></DIV></DIV></BLOCKQUOTE>
<DIV> </DIV>
<DIV>I keep thinking that if we limit ourselves to a maximum Rx frequency of 30
MHz or so, it should be possible to build a nice little Rx with 100-Base-T
Ethernet (maybe even PCI). It probably wouldn't be much cheaper than Mercury
given the costs of the ADC and FPGA, but it would be getting close to having a
"blade" receiver architecture :-).</DIV>
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<DIV>73's,</DIV>
<DIV>Andrew</DIV></DIV></DIV></BLOCKQUOTE></DIV><BR>Cheers,<BR>-- <BR>Larry
Gadallah,
VE6VQ/W7
lgadallah AT gmail DOT com<BR>PGP Sig: B5F9 C4A8 8517 82AC 16B6 02B6 0645
69F0 1F29 A512<BR>
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