QUARTZ
EQAX-20
TCXO with STRATUM III
Long-term stability option
DESCRIPTION
The Euroquartz EQAX-20 TCXO conforms to IEC60679-1, Stratum 3,
providing a low-noise, highly-stable and reliable source of clock signals.
STRATUM III OSCILLATORS
OUTLINES AND DIMENSIONS
FEATURES
Compact, SMD package
Frequency range from 10Mhz to 20MHz
Operating temperature range, -20° to +70°C
Operable temperature -30° to +75°C
Supply Voltage 3.3 Volts
·
SPECIFICATION
Frequency Range:
Standard Frequencies:
Frequency Stability
Initial Tolerance:
Vs. Temperature:
9Mhz to 33Mhz
10, 12.8, 16.384, 19.44MHz
±1ppm @25°C
±2.5ppm -40°~+85°C
±1.5ppm -20°~+70°C
-0.8ppm 0°~+50°C
±0.2ppm
±0.2ppm
±1ppm (@40°C)
±4.6ppm
±5ppm
0.25~+4.5V (Option II = ‘50’
0.30~+3.0V (Option II = ‘33)
Positive
10k Ohms
Vs. Supply Voltage Var:
Vs. Load Change:
Long Term Ageing (1st Year):
Long Term Stab. (15 Years):
Frequency Adjustment Range
Electronic Frequency Control
EFC Voltage Vc:
EFC Slope:
EFC Input Impedance:
Absolute Pull Range:
RF Output
Signal Waveform:
Load:
Symmetry (Duty Cycle):
Start-up Time:
Supply Voltage:
Current Consumption:
Operable Temperature Range:
Storage Temperature Range:
Enclosure:
PAD CONNECTIONS
Pad
No.
1
2
4`
5
Symbol
VC
GND
RF OUT
Vs
Function
Voltage Control
Ground
RF Output
Supply Voltage
ENVIRONMENTAL
Test
Visual inspection,
Dimensions
Sealing tests
Solderability,
Resistance to
soldering heat
Shock
Bump
Free fall
IEC 60068
Part . .
IEC 61178-1
Clause . .
4.5
4.6
4.8.2
4.8.3
Test Conditions
Enclosure styles as in
IEC 60122-3, if applic.
Gross Leak: Test Qc
Fine Leak: Test Qk
Test Ta (235±5°C),
method 1 Test Tb,
method 1A, 5s
Test Ea, 3x per axis
100g, 6ms 1/2sine
Test Eb, 4000 bumps/
axis, 40g, 6ms
Test Ed, procedure 1,
2 drops from 1m ht.
Test Fc, 30 min/axis,
10Hz-55Hz, 0.75mm;
55Hz -2kHz, 10g
Test Na, 10 cycles at
extremes of operating
temperature range.
Test Ba, 16 h at upper
temperature.
Test Db variant 1
severity b, 55°C/95%rh
Test Aa, 2h at lower
temperature indicated
by climatic category.
Sequence of 4.8.11,
4.8.12 and 4.8.13
Test Ca, 56 days
HCMOS
15pF
60%/40%
4 ms
+5.0V±5%/+3.3V±5%
25mA maximum (@25°C)
-40°~+85°C
-40°~+85°C
As drawing
2-17
2-20
2-27
2-29
2-32
2-6
4.8.8
4.8.6
4.8.9
4.8.7
ORDERING CODE
To order, specify as follows:
Vibration,
Sinsoidal
Rapid change of
Temperature
Dry heat
Damp heat, cyclic
OPTION I - Tolerance vs Temperature
25 = ±2.5ppm -40°~+85°C
15 = ±1.5ppm -20°~+70°C
08 = 0.8ppm 0°~+50°C
OPTION II - EFC Voltage
50 = 0.25V~4.75V
33 = 0.30V~3.0V
OPTION III - Long Term Stability
46 = ±4.6ppm overall, 15 years
Cold
FREQUENCY-MODEL-OPTION I-OPTION II-OPTION III
EXAMPLE:
2-14
4.8.5
12.800MHz EQAX-20-25-50-46
2-2
2-30
2-1
4.8.11
4.8.12
4.8.13
Climatic sequence
Damp heat, steady
state
Endurance tests,
- ageing
- extended ageing
1-7
2-3
4.8.14
4.8.15
4.9.1
4.9.2
30 days @ 85°C
1kh, 2kh, 8kh, @85°C
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 1460 230000 Fax: +44 1460 230001 email: info@euroquartz.co.uk web: www.euroquartz.co.uk
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