[time-nuts] FE5860A CONNECTIONS?

Dan Rae danrae at verizon.net
Tue Mar 15 19:16:08 UTC 2011


On 3/14/2011 5:09 PM, Dan Rae wrote:
> I have just got one of these in from Hong Kong.  FEI Part number: 
> 217400-30352-1.   It is mounted on a cut piece of PC board.  The 
> seller and three other sellers have different versions of the 
> connections of these, some, the majority, say that +5v goes to pin 3 
> but the seller of mine says pin 4.
>
Answering my own message, with help from others, thanks to them:

This is for FEI Part number: 217400-30352-1 as offered widely on eBay.

Pin 4 needs +5 V at about 80 mA to produce any output at all with return 
to pin 2.

Pin 3 is a TTL level logic output: High when out of lock, Low when 
locked.   I don't think putting power into that pin as some vendors 
indicate would be good karma.

Main supply +15 V on pin1 about 1.3A reducing to 0.8 A when warmed up. 
Gnd on Pin2.

Pin 7 is 10 MHz output, with 5 the return for that and maybe any data on 
8 and 9, RS232 is not yet checked.

Mine is way out by time nuts standards, it drifts 40 nS in phase 
compared to GPS in one minute at 10 MHz, and the trimmer on the side 
does nothing.

I opened it up and could glean little from that, there are obviously 
many variants of this because there are many alternative links and areas 
of board unpopulated.

Dan








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