[time-nuts] Silicon Labs series of oscillators...
paulswedb at gmail.com
Sat Jan 22 17:57:46 UTC 2011
Is your work area grounded to the soldering iron tip. If not the tip can
generate a discharge.
Though as someone commented unlikely.
The fact that 2 are bad does point to a miscount on the pins potentially.
My trick on one offs as most of my projects are and at the old hand solder
limit is a piece of pc board flip the chips over and dead bug the critters.
The pc board makes a nice ground plane. I use small rigid coax for various
interconnects... Its a task but seems to work well and the ICs and things do
work with stability. Though have never dealt with a 40-300 pin package.
Generally in the 10 pin count range.
On Sat, Jan 22, 2011 at 11:49 AM, Richard (Rick) Karlquist <
richard at karlquist.com> wrote:
> On 1/22/2011 6:04 AM, Michael Baker wrote:
> I have a need for a 110 MHz VCXO in a 1.8GHz to 7.5GHz
>> tracking generator I am building for my Tek 494 spectrum
>> analyzer. I bought a pair of Silicon Labs 110 MHz VCXO
>> chips for less than $25 for the pair from Cramer
>> Distributors. The Si595 VCXO chips are in an
>> "industry standard" 5mm X 7mm surface-mount package.
> These so called "VCXOs" are not VCXO's. They are just
> synthesizers that functionally emulate a VCXO. The phase
> noise and jitter are poor as compared to a real VCXO,
> such as a CTS 357L ($8 at Digikey).
> Maybe they will work in your application anyway, just don't
> kid yourself about what you are getting.
> Rick Karlquist N6RK
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