The only way to really make this work "properly" is to go closed-loop. At that point, you might as well use an external reference. I've pointed out before
that 10MHz OCXOs are available cheaply, and generally achieve 100PPB *at worst*, even the "scrap pulls" that are cheaply available on eBay usually
acheive better than 50PPB. $20.00 and a bit of soldering, and you have a pretty-darned good reference that you can even share among multiple units,
with a bit of skill.
This is perhaps better than voiding warantees on expensive hardware....
on May 15, 2014, Nick Foster <bistrom...@gmail.com> wrote:
The ADF4001's output charge pump is tristated when not locking to an external reference, and a resistor divider holds the VCTCXO's tuning input at 1/2 Vcc. The B200 hardware can use the AD9361's low-speed DAC to drive the VCTCXO's tuning input via AUXDAC1 if R118 is populated; however, this functionality is not supported by the B200 UHD driver.--n
On Thu, May 15, 2014 at 2:48 AM, Robert Light <robert.li...@gmx.de> wrote:
Hi, In case we use on-board oscillator , how is ADF4001 configured? Does CP (pin20) output affect the VCXO_Tune ? Is it possible to control this chip directly from the command line?
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