[time-nuts] Advice on 10 MHz isolation/distribution (Clay)

Pete Rawson peterawson at earthlink.net
Sat Feb 20 21:50:51 UTC 2010


I'm not sure what the "leadless" package looks like, so I'll check it out.

The only older leadless packages I can't deal with are BGA and the
leadless ceramic chip carrier. Would you send me a complete P/N
to be sure I'm looking at the right thing?

This would still be a very useful accessory, even if the reverse
isolation results were down to 60dB.


On Feb 20, 2010, at 12:46 PM, life speed wrote:

> From: Pete Rawson <peterawson at earthlink.net>
> Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution
> To: Discussion of precise time and frequency measurement
>     <time-nuts at febo.com>
> Message-ID: <1027D446-FE23-45A7-88AD-1CFD339C4ABB at earthlink.net>
> Content-Type: text/plain; charset=us-ascii
> Clay,
> I would really like to have a copy of your test board for this effort.
> I'm sure it will be a challenging layout. But it could be a very handy
> piece of hardware. Supporting a PCA order would easy to do.
> Pete Rawson
> I always buy more than one PCB, 5 - 6 don't cost any more than 1.  Unfortunately, I don't think my favorite prototype shop (PCB123) will be suitable for a layout with voids in the ground plane (reduce parasitic C) under the opamp and R4003C on the top layer, so I will have to do a 'real' PCB.  I was also planning on using the leadless version of the part, which could be challenging for home assembly.
> Everything is leadless these days.  Gives me fits sometimes.  I just went through a nightmarish experience with a leadless ARM7 processor that needed some wires added.  I replaced it with a leaded part at a cost of 2 mm PCB area  . . .   but I digress.
> Clay
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