u-blox UBX-G7020 - 3.2 Crystal (Y2)

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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