UBX-G7020 - Hardware Integration Manual
Component Selection
GPS.G7-HW-10003
Objective Specification
Page 48 of 74
3
Component Selection
This section provides some information on components that are critical for the performance of the UBX-G7020
chip. Of course, temperature range specifications need only be as wide as required by a particular application.
3.1
TCXO (Y1)
ID
Parameter
Value
1
Frequency Specifications
1.1
Nominal frequency at 25ºC
26 MHz (other frequencies possible, see datasheet
1
)
1.2
Frequency calibration tolerance at 25ºC
< ±2.0 ppm
1.3
Operating temperature range I
-40 °C +85 °C
1.4
Operating temperature range II
-30 °C +85 °C
1.5
Frequency stability over operating temperature range I
referenced to the midpoint between min. and max. frequency
value over this temperature range
< ±2.5 ppm
1.6
Frequency stability over operating temperature range II
referenced to the midpoint between min. and max. frequency
over this temperature range
< ±0.5 ppm
1.7
Frequency slope
2
over -30ºC to 85ºC
< 0.1 ppm / ºC
1.8
Frequency slope
3
over -40ºC to -30ºC
< 0.5 ppm / ºC
1.9
Static temperature hysteresis
4
< ±0.6 ppm
1.10
Supply Voltage Stability, ±5% supply voltage change at 25°C
< ±0.1 ppm
1.11
Load Sensitivity, ±10% load change at 25°C
< ±0.2 ppm
1.12
Long term stability, frequency drift over 1 year
< ±1.0 ppm
1.13
Long term stability, frequency drift over 2 years
< ±2.0 ppm
1.14
Long term stability, frequency drift over 10 years
< ±4.0 ppm
1.15
G Sensitivity, all 3 axes, random vibration, 30 Hz to 1.5 kHz
< 1.5E-9 (1.5 ppb) per G
1.16
Shock, frequency shift after 1000G 250 µs sine
< ±0.5 ppm
2
Electrical Specifications
2.1
Supply Voltage
5
1.75 – 2.0 V or 2.5 – 3.6 V
2.2
Supply Current at maximum supply voltage
< 1.5 mA
3
Oscillator output
3.1
Output Waveform
DC coupled clipped sine wave
3.2
Output voltage level peak to peak at minimum supply voltage
> 0.8 V
3.3
Output voltage DC offset
3.4
Output load resistance
9.0 – 11.0 k
3.5
Output load capacitance
9.0 – 11.0 pF
4
SSB phase noise
4.1
Typical SSB Phase Noise Density, 1 Hz offset
< -57 dBc/Hz
4.2
Typical SSB Phase Noise Density, 10 Hz offset
< -88 dBc/Hz
4.3
Typical SSB Phase Noise Density, 100 Hz offset
< -112 dBc/Hz
4.4
Typical SSB Phase Noise Density, 1 kHz offset
< -130 dBc/Hz
4.5
Typical SSB Phase Noise Density, 10 kHz offset
< -140 dBc/Hz
5
Environmental specifications
5.1
Shock
Half sine wave acceleration of 100 G peak amplitude for 11 ms
1
UBX-G7020-Kx Data Sheet
[1] and
UBX-G7020-CT Data Sheet
2
Minimum of 1 frequency reading every 2ºC.
3
Minimum of 1 frequency reading every 2ºC.
4
Frequency change after reciprocal temperature ramped over the operating temperature range I. Frequency measured before and after at
25°C.
5
Depends on system supply voltage, see section 2.4.5.
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