u-blox UBX-G7020, Руководство по интеграции оборудования

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UBX-G7020 - Hardware Integration Manual
Component Selection
GPS.G7-HW-10003 Objective Specification Page 50 of 74
3.2 Crystal (Y2)
ID Parameter Value
1 Frequency Specifications
1.1 Oscillation mode Parallel Resonance, Fundamental Mode
1.2 Nominal frequency at 25 ± 3 ºC 6 26 MHz (other frequencies possible, see datasheet 7 )
1.3 Frequency calibration tolerance at 25 ± 3 ºC 8 < ±7.0 ppm
1.4 Frequency stability over operating temperature range
referenced to frequency reading 25 ± 3 ºC
9
< ±15.0 ppm
1.5 Operating temperature range
-40 °C +85 °C
1.6 Frequency perturbations 10 < 0.5 ppm
1.7 Static temperature hysteresis 11 < ±0.4 ppm
1.8 Short term stability, root Allan variance ( = 1 s) < 1.0E-9 (1.0 ppb)
1.9 Long term stability, frequency drift over 1 year < ±1.0 ppm
1.10 Long term stability, frequency drift over 2 years < ±1.5 ppm
1.11 Long term stability, frequency drift over 10 years < ±5.0 ppm
1.12 G Sensitivity, all 3 axes, random vibration, 30 Hz to 1.5 kHz < 1.5E-9 (1.5 ppb) per G
1.13 Shock, frequency shift after 1000G 250 µs sine < ±0.5 ppm
2 Electrical Specifications
2.1
Load capacitance C
L
19 pF
2.2
Equivalent circuit (shunt) capacitance C
0
< 6 pF
2.3
Pullability
< 12 ppm/pF
2.4 Maximum Drive Level (only at oscillator start-up, if required) 200 µW
2.5 Operating Drive Level 10 - 80 µW, corresponding to 10 – 50 mV
2.6 Drive level dependency (DLD) 12
< 0.6
2.7 Equivalent series resistance (ESR) 15 - 60
3 Electrical Specifications
3.1 Shock Half sine wave acceleration of 100 G peak amplitude for 11 ms
duration, 3 cycles each plane
3.2 Vibration 10 G RMS 30 Hz to 1500 Hz, duration of 6 hours
3.3 Humidity 48 hours at 85 °C 85% relative humidity non-condensing
3.4 Thermal shock Exposed at –40 °C for 30 minutes then to 85 °C for 30 minutes
constantly for 120 cycles (5 days)
3.5 Storage temperature -40 °C +85 °C
4 Manufacturing Information
4.1 Solder Process Able to withstand solder reflow process, min. 3 Cycles (240 °C,
20 s)
4.2 Packaging description Tape and Reel
Table 15: GPS crystal specifications
Manufacturer Order No.
Rakon IEC19RSX-8 26.000MHz XZC918
Rakon IEC19RSX − 10 26.000 MHz XZD182
Table 16: Recommend parts list for GPS reference crystal
6
A reference temperature can be defined with crystal supplier within this range.
7 UBX-G7020-Kx Data Sheet [1] and UBX-G7020-CT Data Sheet [2].
8 Same reference temperature as in 2.2
9
Same reference temperature as in 2.2
10 Peak to peak deviation from the frequency versus AT temperature curve fit. Minimum of 1 frequency reading every 3 °C over operating
temperature range. 100% testing and screening for frequency perturbations and micro jump occurrence.
11
Frequency change after reciprocal temperature ramped over the operating temperature range. Frequency measured before and after at
25 °C.
12 Resistance change of 10 different power levels from 0.001 µW to 100 µW
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