[time-nuts] Surface Mount OCXO Questions

[Jim Lux]

On 10/31/13 4:02 AM, Bob Camp wrote:
> Hi
>
> The control voltage on the 12 V OCXO is likely 0-10V or 0-5V. The
> tune on the 3.3V part isn’t going to be above 3.3V and it may be
> 0-2.5V. The 3.3V part is going to be at least 8X more sensitive to
> grounding issues.

I've got a BUNCH of VCOs that are 3.3V or 5V, and have 15V tuning 
ranges.  It's a real pain when you're looking to swap VCOs in a PLL to 
change the tuning range in a breadboard.

Minicircuits ROS-3710 is a fine example.. 5V operation, tuning range 0.5-13V

ROS-3388-219 is the same.

It's because the tune port goes right to the varactor, which is, not so 
oddly, DC blocked from the amplifier circuit running on 5V
>
> To put this in perspective, you can see a change on a normal 12V part
> grounding it on the top side of a PC board vs grounding it on the
> bottom side of the board. The 0.032” of solid ground lead has enough
> drop to be noticeable.
>