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PHONE: (434) 295-3101
FAX: (434) 977-1849
Charlottesville, VA USA
www.isotemp.com
OCXO 143-3
CRYSTAL
OSCILLATOR
SPECIFICATION
This specification defines the operating characteristics of
an ovenized crystal oscillator. Long term stability is
assured through use of premium components.
REV DESCRIPTION OF REVISION
-
A 7.3. was 125-543. 1.5. was 40% to 60%.
B 7.3. was 125-569.
BY APV
DATE
TST TST 12-11-2000
BTG TST 01-20-2004
LRB JRD 04-07-2005
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-3
PAGE OF TOTAL DWG. NO. REV.
1 3 114-1003 B

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Charlottesville, VA USA
www.isotemp.com
OCXO 143-3
1. OUTPUT
1.1. Frequency
1.2. Waveform
1.3. Level
1.4. Load
1.5. Duty cycle
1.6. Spurious
2. FREQUENCY STABILITY
2.1. Ambient
2.2. Aging
a. At time of shipment
b. After indefinite storage
i. Daily
ii. Yearly
iii. 10 years
2.3. Voltage
2.4. Warm-up
2.5. Phase noise
a. @ 10 Hz
b. @ 100 Hz
10.000 MHz
Rectangular
HCMOS
20 pF
45% to 55% @ +2.5 VDC
< -60 dBc
< ±2x10-8 from 0°C to +70°C
(referenced to +25°C)
< ±1x10-9/day
< ±1x10-9 after 30 days
< ±1x10-7
< ±3.5x10-7
< ±1x10-8/±5% change
< ±1x10-8 in 3 minutes @ +25°C
(referenced to 4 hours)
< -115 dBc
< -135 dBc
3. ELECTRICAL FREQUENCY ADJUSTMENT (PIN = "VCO INPUT")
3.1. Range
> ±4x10-7
< ±10x10-7 (At time of shipment)
(Referenced to nominal frequency)
3.2. Control
0 VDC to Vref (+4 VDC) or
a 20 kpotentiometer connected
between the "REFERENCE VOLTAGE" pin
and "0 VOLTS & CASE" pin with wiper
connected to "VCO INPUT" pin.
3.3. Slope
Positive
3.4. Center
+2.0 VDC ±0.6 VDC
(control voltage at which nominal
frequency occurs at time of shipment)
3.5. Linearity
< ±10%
3.6. Input impedance
> 50 k
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-3
PAGE OF TOTAL DWG. NO. REV.
2 3 114-1003 B

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Charlottesville, VA USA
www.isotemp.com
OCXO 143-3
4. INPUT POWER (PIN = "+VDC")
4.1. Voltage
4.2. Current
4.3. Steady state
+5 VDC ±5%
< 700 mA @ turn on
< 1.5 Watts @ +25°C
5. REFERENCE VOLTAGE (PIN = "REFERENCE VOLTAGE"), an output
5.1. Voltage
+4 VDC ±5%
5.2. Load
> 4 k
5.3. Temperature stability
< ±0.010 VDC
(Over temperature range in 2.1.)
6. ENVIRONMENTAL
6.1. Humidity
6.2. Storage temperature
6.3. Vibration (non-operating)
6.4. Shock (non-operating)
6.5. Seal
MIL-STD-202, Method 103B, Test
Condition A (95% R.H. @ +40°C,
non-condensing, 240 hours)
-50°C to +105°C
MIL-STD-202 Method 201A. (0.06" Total
p-p, 10 to 55 Hz)
MIL-STD-202, Method 213B, Test
Condition J.
(30 g, 11 ms half-sine)
MIL-STD-202 Method 112C, Test
Condition D.
7. MECHANICAL
7.1. Applicable series
7.2. Model number
7.3. Outline drawing
OCXO 143 series
OCXO 143-3
125-606
NOTE: This unit is available with Sine wave output as OCXO 143-2.
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-3
PAGE OF TOTAL DWG. NO. REV.
3 3 114-1003 B

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P/N:
MOD:
FREQ.:
S/N:
DATE:
FSC: 31785
(VIEW FROM TOP)
GLASS STANDOFF
(4 PLACES)
0.700
17.78
CENT.
0.026
0.66
0.59 MAX.
14.99
0.20 MIN.
5.08
0.030 DIA. PIN (5 PLACES)
0.76
PIN CONNECTIONS
PIN
1
(See Note 1)
2
(See Note 1)
3
4
5
FUNCTION
VCO INPUT
or
NOT CONNECTED
REFERENCE VOLTAGE
or
NOT CONNECTED
+VDC
R.F. OUTPUT
0 VOLTS & CASE
Note 1. If the specification does not specify
parameters for either PIN1 or PIN2 then that
respective PIN is NOT internally CONNECTED.
3
2
CL
4
0.700
17.78
CENT.
1.015
25.78
SQ. MAX.
15
(VIEW FROM BOTTOM)
NUMBERS FOR REFERENCE ONLY
(NOT STAMPED ON UNIT)
INCH
mm (REFERENCE ONLY)
Form NO. 120-081E
OSCILLATORS
NAME: OUTLINE DRAWING
(OCXO 143 SERIES)
CODE I.D. NO.
31785
Charlottesville, Virgina USA
SCALE: 2:1
DATE: 09-23-2002
DWN. BY: DAG APPR'D. BY: TST
LET REVISION
BY APP
DATE
TOLERANCES
UNLESS OTHERWISE SPECIFIED:
ANGES: ±1 DEGREE
FRACTIONS: ±1/32 INCH
DECIMALS: .XX ± .015, .XXX ± .010 INCH
MATERIAL: STEEL
FINISH: NICKEL
MARK: LABEL