Thank you all - I think I'll hook one up to a roach for development, but
will investigate further before any deployment.
Cheers
Danny
On 06/05/2011 17:24, Stuart Rumley wrote:
Hi and Danny,
The 5007 has low-noise, low-drop out linear voltage regulators on board.
The VCO/PLL and reference are regulated at 3.3V. The output buffer is
regulated at 4.7V. There should be sufficient headroom for regulation with
a 5V input. I would expect most switching power supplies would work fine
and you should be okay with the Roach ATX 5V. Problems with noise from
switching supplies can sometimes be traced to ground-loop currents flowing
through the system. Careful system layout can usually correct any problems.
If you have any problems I would love to hear about it and help correct the
situation so you can power the 5007 directly.
Stuart
-----Original Message-----
From: Dan Werthimer [mailto:[email protected]]
Sent: Friday, May 06, 2011 7:15 AM
To: Danny Price
Cc: Stuart Rumley; [email protected] CASPER
Subject: Re: [casper] Valon 5007 on ROACH ATX power
hi danny, cc stuart rumley, valon technology
i agree with dana - if you use a switching power
supply to power a synthesizer, the phase noise
and jitter will likely be terrible and you'll get spurs
and degraded SNR.
i suggest you check with stuart rumley, the designer
of the valon technology synthesizer, (cc'ed on this)
to see if there is additional voltage regulation and
filters on the synthesizer board and if you can get away
with using a switching power supply and removing
the 5 volt regulator.
btw, nrao has developed linux drivers for the valon 5007.
best wishes,
dan
Dear All
We are the proud new owners of some Valon 5007 synthesizer modules,
which we plan to use to clock our ROACHes:
http://www.valontechnology.com/products.html
http://casper.berkeley.edu/wiki/Inexpensive_Synthesizer_Boards
It has a 5V LDO voltage regulator, so they recommend an input voltage
of 6V. We were thinking of just powering these with the ROACH ATX 5V
supply and housing them inside the ROACH chassis; has anyone done this
before or have any advice?
Cheers
Danny
