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OCXO 143-11
P.O. BOX 3389
CHARLOTTESVILLE, VIRGINIA 22903
PHONE: (804) 295-3101
FAX: (804) 977-1849
www.isotemp.com
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
REQ. DWN.
BY BY
DATE
- TST DWR 11-27-96
A Updated specification to ISOTEMP catalogue
OCXO 143-1, except Rectangular output.
TST TST 05-08-98
B Changed PPM values to scientific notation.
TST TST 07-24-00
2.5. was < ±0.1 PPM in 3 minutes @ +25°C
(referenced to 4 hours), 2.6. was < -90 dBc @
10 Hz
C Added pin information to 3. 4. and 5. Added
Notes 1 & 2.
TST TST 12-11-00
ISOTEMP RESEARCH INC. CODE ID. PART NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-11
PAGE OF TOTAL DWG. NO. REV.
1 3 114-703 C

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OCXO 143-11
1. OUTPUT
1.1. Frequency
1.2. Waveform
1.3. Level
1.4. Load
1.5. Duty cycle
1.6. Spurious
10.000 MHz
Rectangular
HCMOS
20 pF
40% to 60% @ +2.5 VDC
< -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. Short term
2.5. Warm-up
2.6. Phase noise
a. @ 10 Hz
b. @ 100 Hz
c. @ 1 kHz
d. @ 10 kHz
< ±1x10-7 from 0°C to +70°C
(referenced to +25°C)
< ±1x10-8/day
< ±1x10-8 after 30 days
< ±1x10-6
< ±4x10-6
< ±3x10-8/±5% change
< 1x10-9/1 second
root Allan variance
< ±1x10-7 in 3 minutes @ +25°C
(referenced to 1 hour)
< -95 dBc
< -120 dBc
< -145 dBc
< -150 dBc
3. ELECTRICAL FREQUENCY ADJUSTMENT (PIN = "VCO INPUT")
3.1. Range
> ±10x10-6
< ±20x10-6
3.2. Control
0 VDC to Vref (+4 VDC) or
a 10 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 ±0.4 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. PART NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-11
PAGE OF TOTAL DWG. NO. REV.
2 3 114-703 C

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OCXO 143-11
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. Available current
1 mA
5.3. Temperature stability
< ±0.010 VDC
(Over temperature range in 2.1.)
6. ENVIRONMENTAL
6.1. Storage temperature
6.2. Vibration (non-operating)
6.3. Shock (non-operating)
6.4. Seal
-55°C to +85°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 143-11
125-502
NOTES:
1. This unit is available with Sine wave output as OCXO 143-1.
2. The original package height was nominally 0.400 inches tall. All
units manufactured after 12-11-2000 will nominally be 0.460 inches
tall. This new height is within the maximum package height of 0.500
inches called out on outline drawing 125-502.
ISOTEMP RESEARCH INC. CODE ID. PART NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-11
PAGE OF TOTAL DWG. NO. REV.
3 3 114-703 C

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P/N:
MOD:
FREQ.:
S/N:
DATE:
FSC: 31785
(VIEW FROM TOP)
METAL
STANDOFF
(4 PLACES)
0.50
12.70
MAX.
0.015
0.38
0.20
5.08
MIN.
0.030
0.76
DIA. PIN
(5 PLACES)
1.015
25.78
MAX.
SQUARE
0.700
17.78
CENT.
34
CL 2
0.700
17.78
CENT.
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 PIN1 and/or PIN2 then that
respective PIN is NOT internally CONNECTED.
15
(VIEW FROM BOTTOM)
NUMBERS FOR REFERENCE ONLY
(NOT STAMPED ON UNIT)
INCH
mm (REFERENCE ONLY)
Form NO. 120-081E
OSCILLATORS
NAME: OUTLINE DRAWING
(TCXO 65/OCXO 143 SERIES)
CODE I.D. NO.
31785
Charlottesville, Virgina USA
SCALE: 1.5:1 DATE: 10-31-1996
DWN. BY: JAC
APPR'D. BY: DAG
E ADDED METRIC DIMENSIONING.
LET REVISION
LRB DAG
BY APP
12-03-01
DATE
TOLERANCES
UNLESS OTHERWISE SPECIFIED:
ANGES: ±1 DEGREE
FRACTIONS: ±1/32 INCH
DECIMALS: .XX ± .015, .XXX ± .010 INCH
MATERIAL: COLD ROLLED STEEL
FINISH: BRIGHT NICKEL
MARK: LABEL