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PHONE: (434) 295-3101
FAX: (434) 977-1849
Charlottesville, VA USA
www.isotemp.com
OCXO 131-1003
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
BY APV
DATE
- BTG TST 03-04-2006
ISOTEMP RESEARCH INC. CODE ID MODEL NO. PAGE OF TOTAL DWG. NO. REV.
CHARLOTTESVILLE, VA.
USA
31785 OCXO 131-1003 1
2 114-1247 -

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Charlottesville, VA USA
www.isotemp.com
OCXO 131-1003
1. OUTPUT (PIN = "R.F. OUTPUT")
1.1. Frequency
10.000 MHz
1.2. Waveform
Rectangular
1.3. Level
HCMOS
a. "1" level
> Vcc - 0.5 V
b. "0" level
< +0.3 V
1.4. Load
5 HCMOS loads
1.5. Duty cycle
40% to 60% @ 50% level
1.6. Rise/fall time
< 10 ns (10% to 90%)
1.7. Spurious
< -60 dBc
2. FREQUENCY STABILITY
2.1. Ambient
< ±1x10-8, -20°C to +70°C
(referenced to +25°C)
2.2. Aging
a. At time of shipment
< ±1x10-9/day
b. After indefinite storage
i. Daily
< ±1x10-9 after 30 days
ii. Yearly
< ±1x10-7
iii. 10 years
< ±4x10-7
2.3. Voltage
< ±3.5x10-9/±5% change
2.4. Short term
< 2x10-11/second
root Allan variance
2.5. Warm-up
< ±1x10-7 in 15 minutes
(referenced to 1 hour)
2.6. Phase noise
a. @ 100 Hz
< -140 dBc
b. @ 10 kHz
< -150 dBc
3. ELECTRICAL FREQUENCY ADJUSTMENT (PIN = "VCO INPUT")
3.1. Range
> ±5x10-7
< ±1x10-6 (At time of shipment)
(Referenced to nominal frequency)
3.2. Control
0 to +5 V
3.3. Slope
Positive
3.4. Center
+2.5 ±0.3 V
(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
+5 V ±5%
4.2. Current
< 800 mA @ turn on
4.3. Steady state
< 1.25 Watts @ +25°C
5. MECHANICAL
5.1. Applicable series
OCXO 131 series
5.2. Model number
OCXO 131-1003
5.3. Outline drawing
125-587
ISOTEMP RESEARCH INC. CODE ID MODEL NO. PAGE OF TOTAL DWG. NO. REV.
CHARLOTTESVILLE, VA.
USA
31785 OCXO 131-1003 2
2 114-1247 -

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P/N:
MOD:
FREQ.:
S/N:
DATE:
FSC: 31785
(VIEW FROM TOP)
0.75
19.05
MAX.
0.026
0.66
0.20
5.08
MIN.
0.031
0.79
DIA.
PIN
(5
PLACES)
GLASS STANDOFF
(4 PLACES)
1.43
36.32
MAX.
1.000
25.40
CENT.
3
CL 2
1
4
5
0.700 CENT.
17.78
1.07
27.18
PIN CONNECTIONS
PIN FUNCTION
VCO INPUT
1 or
(See Note 1) NOT CONNECTED
REFERENCE VOLTAGE
2 or
(See Note 1) NOT CONNECTED
3 +VDC
4 R. F. OUTPUT
5 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.
(VIEW FROM BOTTOM)
NUMBERS FOR REFERENCE ONLY
(NOT STAMPED ON UNIT)
INCH
mm (REFERENCE ONLY)
OSCILLATORS
NAME: OUTLINE DRAWING
(TCXO 141 & OCXO 131 SERIES)
A 1.07 WAS 1.07 MAX.
LET REVISION
FORM NO. 120-081D
CHARLOTTESVILLE, VIRGINIA
CODE I.D. NO. SCALE: 1:1
DATE: 12-04-00
31785 DWN. BY: LRB
APPR'D. BY: DAG
DAG TST 12-6-01
BY APP DATE
TOLERANCES
UNLESS OTHERWISE SPECIFIED:
ANGLES: ±1 DEGREE
FRACTIONS: ±1/32 INCH
DECIMALS: .XX ±.015, .XXX ±.010 INCHES
MAT'L: STEEL
FINISH: NICKEL
MARK: LABEL