Material for schematics review
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Schematics
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LO/REF/CAL connector RADIALL R694252107 mapping
Question to design office:
I noticed that symbol RADIALL R694252107 is not following the datasheet
(http://www.mouser.com/ds/2/516/R694252107EN-855118.pdf )
The pin numbering in the datasheet is divided into two rows (A and B),
and then three column, which are 1A,1B,1C. The result is A/1A,A/1B, A/1C
and B/1A,B/1B,B/1C
In the symbol there are three rows (labelled 1,2,3) and I'm confused on
the correct assignment
Could you clarify this?
Answer:
Voici la correspondance schéma/PCB qui avait été faite selon l’exemple
envoyé par Grzegorz Kasprowicz.
Il suffit de remplacer 1A par 1, 1B par 2, 1C par 3 pour obtenir la correspondance. Cela évite la confusion entre le numéro des broches et les parties J?A, J?B, J?C imposées par la numérotation d’Altium. Cela évite également de surcharger le symbole avec des numéros de broches long et pas forcément explicite (A-1A, A-1B, A-1C, B-1A, B-1B, B-1C).
OCXO selection and protection from airflow
The OCXO package is a standard CO-08 euro case, therefore you can choose
different OCXOs in case of shortage, but Morion is the best in terms of
phase noise & stabilty. Other units may have slightly better phase noise
but worst stability.
The priority list in terms of OCXO selection is:
- Morion MV209 (default supported by the designed board without modifications)
- Axtal AXIOM45 series with SC-cut crystal (supported by the designed
board without modifications if package is CO-08)
- IQOV-164-4 (supported by the designed board with 0-ohm resistor
modifications)
Remember to shield the OCXO from the mTCA airflow (lateral airflow from
OCXO's point-of-view). I found some products
(https://hollandshielding.com/Fixed-PCB-shielding-cans) which might do
the job. Holland can make it with custom specifications:
Quote:
Series : 1515 - Fixed PCB shielding can with removable lid
Length (mm) : 30 (increase it a bit, better 35)
Width (mm) : 40 (increase it a bit, better 45)
Heigth(mm) : 22 (mTCA max height is 25mm, probably we don't need a top
cover, but better to keep it as an option)
Mounting : T - Teeth for mounting on the PCB
Cooling : CO - With cooling holes
Quantity : 10 Piece(s)
Price: 10 Piece(s) of 1515-30-40-22-T-CO, Price Euro 19.80 each