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PHONE: (434) 295-3101
FAX: (434) 977-1849
Charlottesville, VA USA
www.isotemp.com
OCXO 143-2
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 Add pin information to 3. 4. and 5.
2.5.a. was -110, 2.5.b was TBD, Removed
2.5.c. through 2.5.e, In 3.1. ±10x10-7 was
±8x10-7, In 3.4. ±0.6 VDC was ±0.4 VDC.
B 7.7.3. 125-606 was 125-543
C 1.5. was -20 dBc; Added 2.5.c.,-140 dBc
@ 1 kHz; 5.2. was 4kload.
BY APV
DATE
DAG TST 11-19-2003
TST TST 12-07-2000
DAG JRD 12-15-2003
LRB JRD 03-25-2004
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-2
PAGE OF TOTAL DWG. NO. REV.
1 3 114-803 C

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Charlottesville, VA USA
www.isotemp.com
OCXO 143-2
1. OUTPUT
1.1. Frequency
1.2. Wave form
1.3. Level
1.4. Load
1.5. Harmonics
1.6. Spurious
10.000 MHz
Sine wave
+4 ±2 dBm
50
< -25 dBc
< -60 dBc
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
c. @ 1 kHz
< ±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
< -140 dBc
3. ELECTRICAL FREQUENCY ADJUSTMENT (PIN = "VCO INPUT")
3.1. Range
> ±4x10-7
< ±10x10-7
3.2. Control
0 VDC to +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 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
4. INPUT POWER (PIN = "+VDC")
4.1. Voltage
4.2. Current
4.3. Steady state
+5.0 VDC ±5%
< 700 mA @ turn on
< 1.5 Watts @ +25°C
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-2
PAGE OF TOTAL DWG. NO. REV.
2 3 114-803 C

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Charlottesville, VA USA
www.isotemp.com
OCXO 143-2
5. REFERENCE VOLTAGE (PIN = "REFERENCE VOLTAGE"), an output
5.1. Voltage
+ 4 VDC ±5%
5.2. Load
> 9 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-202F, Method 103A, Test
Condition A (95% R.H. @ +40°C,
non-condensing, 240 hours)
-50°C to +105°C
MIL-STD-202F Method 201A. (0.06"
Total p-p, 10 to 55 Hz)
MIL-STD-202F, Method 213B, Test
Condition J.
(30 g, 11 ms half-sine)
MIL-STD-202F, Method 112C, Test
Condition D.
7. MECHANICAL
7.1. Applicable series
7.2. Model number
7.3. Outline drawing
OCXO 143 series
OCXO 143-2
125-606
NOTE:
This specification differs from the OCXO 143-2 listed in
the ISOTEMP catalogue in the following areas. 1. The Phase
noise is 5 dBc better at 10 Hz. 2. The Maximum Electrical
Frequency Adjustment Range is 2x10-7 larger. 3. The
package height is 0.09 inches taller.
This unit is available with HCMOS output as OCXO 143-3.
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-2
PAGE OF TOTAL DWG. NO. REV.
3 3 114-803 C

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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