Specifications

XT55 Hardware Interface Description
Confidential / Preliminary
s
mo b i l e
XT55_hd_v00.02 Page 81 of 116 17.03.2004
5.3 Hirose antenna connector
XT55 uses two ultra-miniature SMT antenna connectors (GSM
and GPS antenna) supplied from Hirose Ltd. The product name
is U.FL-R-SMT.
The positions of both antenna connectors on the XT55 board can
be seen in Figure 51.
Figure 38: Mechanical dimensions of U.FL-R-SMT connector
Table 21: Product specifications of U.FL-R-SMT connector
Item Specification Conditions
Ratings
Nominal impedance
50 W
Rated frequency DC to 6 GHz
Operating temp: -40°C to +90°C
Operating humidity: max. 90%
Mechanical characteristics
Female contact holding
force
0.15 N min
Measured with a Æ 0.475 pin
gauge
Repetitive operation Contact resistance:
Centre 25 mW
Outside 15mW
30 cycles of insertion and
disengagement
Vibration No momentary disconnections of
1 µs;
No damage, cracks and looseness
of parts
Frequency of 10 to 100 Hz, single
amplitude of 1.5 mm,
acceleration of 59 m/s
2
, for 5
cycles in the direction of each of
the 3 axes
Shock No momentary disconnections of
1 µs.
No damage, cracks and looseness
of parts.
Acceleration of 735 m/s
2
, 11 ms
duration for 6 cycles in the
direction of each of the 3 axes
Environmental characteristics
Humidity resistance No damage, cracks and looseness
of parts.
Insulation resistance:
100 MW min. at high humidity
500 MW min when dry
Exposure to 40°C, humidity of
95% for a total of 96 hours
Temperature cycle No damage, cracks and looseness
of parts.
Contact resistance:
Centre 25 mW
Outside 15mW
Temperature: +40°C ® 5 to 35°C
® +90°C ® 5 to 35°C
Time: 30 min. ® within 5 min. ®
30 min. ® within 5 min
Salt spray test No excessive corrosion 48 hours continuous exposure to
5% salt water