CERN will provide with each QPLL ASIC a Quartz Crystal for operation at the LHC bunch crossing frequency (40.0786 MHz ± 11.2ppm). A layout to interconnect the two devices is recommended. Please see the QPLL manual for further details.
The quartz crystals are cut to the specified frequency by Micro Crystal Switzerland. An Inverted mesa AT crystal packaged in CC1F-T1A, SMD package is used (see Micro Crystal web page for details).
CC1F-T1A: data sheet and packing information
The production crystals (cut to the LHC frequency and 5.5 pF loading capacitance) are marked with any of the following identifiers:
First production lot
MC0350
MC0407
MC0408
MC0410
MC0411
MC0412
MC0414
Second production lot (2005)
MC0414
MC0518
MC0520
MC0523
MC0529
MC0530
MC0536
MC0538
MC0539
MC0541
MC0543
Other markings correspond either to a different frequency or a different loading capacitance. Please check the identifiers before sending your boards for prototyping or production.
Description |
Symbol |
Typ. |
Min. |
Max. |
Unit |
|
1 |
Crystal type |
Inverted mesa AT-Cut |
||||
2 |
Resonance mode |
Fundamental |
||||
3 |
Load Frequency[1] |
FL |
160.314744 |
|
|
MHz |
4 |
Load Capacitance |
CL |
5.5 |
|
|
pF |
5 |
Frequency Tolerance at 25°C |
DFL/FL |
|
-18 |
18 |
ppm |
6 |
Motional Capacitance |
C1 |
|
4.2 |
|
fF |
7 |
Static Capacitance |
Co |
2.8 |
|
|
pF |
8 |
Drive Level |
P |
|
|
500 |
µW |
9 |
Operating Temperature Range |
OTR |
|
0 |
60 |
°C |
10 |
Series Resistance at 25°C |
Rs |
|
|
25 |
W |
11 |
Drift over OTR |
DFL/FL |
|
-10 |
10 |
ppm |
12 |
Aging first year |
DFL/FL |
|
|
± 3 |
ppm |
13 |
Package type |
SMD ceramic |
||||
14 |
Package surface |
|
|
|
29.6 |
mm2 |
15 |
Package height |
|
|
|
1.75 |
mm |
[1] This spec needs a 100% frequency verification over temperature range (5 °C intervals)