Oven Controlled Oscillators (OCXO)

OCXO's 

Oven Controlled Oscillators (OCXO) 

Fordahl 20 

20 mm x 20 mm 

Metal Package 

(no picture) 

OCXO SMD Packages 

Fordahl SMD 1 

14 mm x 9 mm 

Epoxy Package 

Fordahl SMD 4 

25 mm x 22 mm 

Epoxy/Metal Package 

OCXO Through Hole Packages 

Fordahl DIL 14 

20.3 mm x 12.7 mm 

Metal Package 

Fordahl 36 

36 mm x 27 mm 

Metal Package 

(no picture) 

Fordahl 51 

51 mm x 41 mm 

Metal Package 

(no picture) 

Fordahl SA - Erlenstrasse 31, 2555 Brügg, Switzerland - Phone +41 32 366 50 50 - Fax +41 32 366 50 59 - E-mail fordahl@fordahl.com

Series Output 

DFO S1-LHV 

(Femtocell) 

Data Sheet 

DFO S1-KH/LH 

Data Sheet 

HCMOS 

TTL 

Frequency 

Range (Mhz) 

HCMOS 10 to 40 

DFO S4-KH/LH HCMOS 10 to 120 

DFO S4-S 

Data Sheet 

Series Output 

DFO 14-KH/LH 

Data Sheet 

DFO 20-KH/LH/S 

(Stratum III/IIIE) 

Data Sheet 

DFO 20-KH/LH/S 

Data Sheet 

DFO 36-KH/S 

OCXO's 

SMD Models 

Temperature ranges & 

stability (ppm) 

10 to 26 -5 to 70°C | ±0.04 

-10 to 60°C | ±0.1 

-20 to 70°C | ±0.2 

-20 to 70°C | ±0.1 

-40 to 85°C | ±0.2 

SINE 10 -20 to 70°C | ±0.005 

HCMOS 

SINE 

Frequency 

Range (Mhz) 

Through Hole Models 

Temperature ranges & 

stability (ppm) 

Fordahl SA - Erlenstrasse 31, 2555 Brügg, Switzerland - Phone +41 32 366 50 50 - Fax +41 32 366 50 59 - E-mail fordahl@fordahl.com 

Size 

14 x 9 mm 

epoxy 

14 x 9 mm 

epoxy | metal 

25 x 22 mm 

epoxy | metal 

25 x 22 mm 

epoxy | metal 

Size 

Supply 

Voltage (V) 

3.3 

5.0 | 3.3 

5.0 | 3.3 

12 

Supply 

Voltage (V) 

10 to 80 -10 to 60°C | ±0.1 to ±0.5 DIL 14 5.0 | 3.3 

HCMOS 10 to 25 0 to 70°C |

FREQUENCY CONTROL PRODUCTS 

FEMTO BASE STATION SURFACE MOUNT OCXO 

KEY FEATURES 

10 to 26 MHz 

Femto stations compliant over -5 to 70°C up 

to 26 MHz 

APPLICATIONS 

Bases stations 

Function DFO S1 

V control 1 

GND 2 

Output 3 

Vcc 4 

Please consult our application note about PCB design 

DFO S1-LHV (3.3 V) 

TYPE DFO S1 FBS REVISION PL03 CHECKED NE DATE 02.04.2008 PAGE 

9.1±0.2 

5.9 +0.1 

-0.2 

8.9 

1.4 

2.54 

1.0 

1.27 

14.8±0.3 

5.08 

4 3 

TYPE DFO S1-LHV 

Frequency Range 10 to 26 MHz 

Standard Frequencies 13, 19.2 & 26 MHz 

ELECTRICAL SPECIFICATIONS 

supply voltage 3.3 V ± 5 % 

supply power ( warm-up) @ 25°C ≤ 1.9 W; 1.7 W typ. 

supply power ( steady state) @ - 5°C 0.6 W typ. 

supply power ( steady state) @ 25°C 0.4 W typ. 

output load HCMOS 15 pF or 2 TTL 

duty cycle @ 50% level 45/55...55/45 % 

rise/fall times (10 to 90 %) ≤ 5 ns 

high/low levels or output amplitude ≥ 2.8 V/ ≤ 0.3 V 

SSB phase noise (1 Hz B.W.) -85 dBc/Hz @ 10 Hz 

(Typical values at 19.2 MHz) -115 dBc/Hz @ 100 Hz 

-140 dBc/Hz @ 1 kHz 

-150 dBc/Hz @ 10 kHz 

warm-up time @ 25°C ≤ 5 min to reach ± 100 ppb 

FREQUENCY STABILITY detailed tolerances [ ppm ] 

type 

temperature 

range 

model 

code 

stability versus: 

Vcc ± 1 % ageing 

Medium term holdover 

24 hrs 

Holdover 

all types 

steady state 

-5 to 70°C FBS ≤ ± 0.02 

± 3 typ. 

over 5 years 

1 

5.08 

2 

PC board footprint 

≤ ± 0.1 for 5 days (30 to 50°C) 

≤ ± 0.25 for 14 days (-5 to 70°C) 

voltage control on pin 1 (positive slope ) 

≥ ± 4 ppm, ≤ ± 8 ppm relative to frequency at Vco = 1.65 V 

sufficient for 5 years calibration 

1.65 V ± 1.35 V 

Input impedance ≥ 50 kΩ, 

ORDERING CODE type + option code + frequency + model code 

Example DFO S1-LHV 19.200 MHz FBS 

≤ ± 0.07 

(30 to 50°C)


M I N I A T U R E S U R F A C E M O U N T O C X O 

KEY FEATURES 

10 to 26 MHz 

± 0.25 ppm over -20 to 70°C up to 26 MHz 

APPLICATIONS 

Bases stations, frequency reference 


V control 1 

GND 2 

Output 3 

Vcc 4 

Please consult our application note about PCB design 

D F O S 1 - L H V ( 3 . 3 V ) 

TYPE DFO S1 REVISION PL01 CHECKED NE DATE 10.04.2008 PAGE 

9.1±0.2 

5.9 +0.1 

-0.2 

8.9 

1.4 

2.54 

1.0 

1.27 

14.8±0.3 

5.08 

4 3 

TYPE DFO S1-LHV 


Standard Frequencies 12.8, 13, 19.2, 20 & 26 MHz 


supply voltage 3.3 V ± 5 % 

supply power ( warm-up) @ 25°C ≤ 1.9 W; 1.7 W typ 

supply power ( steady state) @ - 20°C 0.7 W typ. 

supply power ( steady state) @ 25°C 0.4 W typ. 

output load HCMOS 15 pF or 2 TTL 

duty cycle @ 50% level 45/55...55/45 % 

rise/fall times (10 to 90 %) ≤ 5 ns 

high/low levels or output amplitude ≥ 2.8 V/ ≤ 0.3 V 


(Typical values at 19.2 MHz) -115 dBc/Hz @ 100 Hz 


-150 dBc/Hz @ 10 kHz 

warm-up time @ 25°C ≤ 5 min to reach ± 100 ppb 

FREQUENCY STABILITY detailed tolerances [ ppm ] 

type 

temperature 

range 

model 

code temperature 


Vcc ± 1 % load ± 10 % ageing 

calibration 

@ 25°C 

all types 

0 to 70°C B27 

-20 to 70°C* C258 

≤ ± 0.2 

≤ ± 0.25 

≤ ± 0.02 ≤ ± 0.01 ≤ ± 0.5 

by control 

voltage 

remark ageing is 1 st year at 25°C 

voltage control on pin 1 (positive slope ) 

≥ ± 4 ppm, ≤ ± 10 ppm relative to frequency at Vco = 1.65 V 

sufficient for 5 years calibration 

1.65 V ± 1.35 V 

Input impedance ≥ 50 kΩ, 

ORDERING CODE type + option code + frequency + model code 

Example DFO S1-LHV 20.000 MHz C17 

1 

5.08 

2 

PC board footprint

FEATURES 

10 MHz 

Standard package 

Very high stability 

APPLICATIONS 

Instrumentation, reference 


Output 1 

Oven alarm output 2 

GND 3 

V ref. 4 

Voltage control 5 

E/D 6 

Vcc 7 


H I G H P E R F O R M A N C E S M D O C X O 

T Y P E D F O S 4 - S 

TYPE DFO S4-S 

Frequency 10 MHz 


supply voltage 12 V ± 5 % 

supply current (no load) @ 25°C ≤ 100 mA 

supply current during warm up ≤ 350 mA 

output load SINE WAVE, 50 Ω 

output level ≥ + 5 dBm, ≤ +10 dBm 

harmonics -20 dBc 



-150 dBc/Hz @ 10 kHz 

-150 dBc/Hz @ 100k Hz 

Enable/disable (pin 6) low = disable, high = enable 

Oven alarm output (pin 2) low = alarm, high = oven ready 

V ref. (pin 4) 5 V 

warm up time ≤ ± 10 ppb in 10 min @ 25°C 

FREQUENCY STABILITY detailed tolerances after 30 days of operation 

temperature model stability versus : 

type 

range code Temperature Vcc ± 5 % Load ± 5 % 

Daily 

ageing 

Yearly 

ageing 

Calibration 

@ 25°C 

all types -10 to 60°C D5 ≤ ± 5 ppb ± 0.5 ppb typ. ≤ ± 0.5 ppb ≤ ± 0.5 ppb ≤ ± 30 ppb ≤ ± 50 ppb 

Long term ageing ≤ ± 500 ppb over 15 years 

Short term stability (Allan variance) 5 x 10 -12 for Ƭ = 1 sec., 1 x 10 -11 for Ƭ = 10 sec. 

OPTIONS CODE 

external voltage V 0 V to Vref centered @ 2.5 V ≥ ± 1 ppm 

ORDERING CODE type + option code + frequency + model code + voltage 

Example DFO 25-S 10 MHz D5/12 

TYPE DFO S4-S REVISION 00 CHECKED NE DATE 19.05.2008 PAGE XX 

2.5 

H±0.2 

8.9 

8.9 

2.5 

20.4 

3.0 

4.0 

20.4 

25.4±0.2 22.2±0.5 

1.2 

7.6 

1 

2 

23.6 

7 

6 

5 

3 4 

7.62 

17.8 

H = 11mm 

PC board footprint


DIL 14 MINIATURE OCXO 

TYPES DFO 14-KH (5 V) & DFO 14-LH (3.3 V) 

FEATURES 

10 to 30 MHz 

Small size and tight stability 

APPLICATIONS 


Function DFO 14 

N.C. or V. control 1 

GND 7 

Output 8 

Vcc 14 

TYPE DFO 14-KH DFO 14-LH 


Standard frequencies 12.8, 16.384, 19.44 & 20 MHz 


supply voltage 5 V ± 5 % 3.3 V ± 5 % 

supply current (no load) @ 25°C ≤ 250 mA ≤ 300 mA 

supply current during warm up ≤ 500 mA ≤ 800 mA 

output load HCMOS 15 pF or 2 TTL HCMOS 15 pF or 2 TTL 

duty cycle @ 2.5 V 40/60...60/40 % 40/60...60/40 % 

rise & fall times (10 to 90%) ≤ 10 ns ≤ 10 ns 

high/low levels ≥ 4.5 V/≤ 0.5 V ≥ 2.7 V/≤ 0.5 V 

SSB phase noise (1 Hz BW) @ 10 Hz -95 dBc/Hz -95 dBc/Hz 

(typical @ 12.8MHz) @ 100 Hz -120 dBc/Hz -120 dBc/Hz 

@ 1kHz -140 dBc/Hz -140 dBc/Hz 

@ 10 kHz -145 dBc/Hz -145 dBc/Hz 

@100kHz -150 dBc/Hz -150 dBc/Hz 

H = 8.8 mm 

warm up time to reach ≤ 1 x 10E-7 ≤ 5 min @ 25°C ref @ 1 hr frequency ≤ 5 min @ 25°C ref @ 1 hr frequency 

FREQUENCY STABILITY detailed tolerances 

type 

temperature 

range 

model 


stability versus : 

ageing/day ageing/ 1 

Calibration 

st year short term @ 25°C 

-20 to 70°C C1727 ≤ ± 1 x 10 E -7 ≤ 2 x 10 E -7 

-20 to 70°C C1757 ≤ ± 1 x 10 E -7 ≤ 5 x 10 E DFO 14 

-7 

-20 to 70°C C2757 ≤ ± 2 x 10 E ≤ 1.5 x 10 

-7 

E -8 

≤ 5 x 10 E ≤ 1 x 10 

-7 

E -10 ≤ ± 0.5 x 10 E -6 

stability versus supply voltage ≤ 1 x 10 E -8 for Vcc ± 5 % 

OPTIONS CODE 

external voltage V 2.5 V ± 2.25 V ≥ ± 2 ppm, positive slope 1.65 V ± 1.5 V ≥ ± 2 ppm, positive slope 

ORDERING CODE type + option code + frequency + model code + voltage value 

Example DFO 14-LH 20 MHz C1727 

TYPE DFO 14-KH/LH REVISION 02 CHECKED NE DATE 13.12.2005 PAGE xx 

PIN 1 

12.7±0.1 

H±0.1 

6.3 

7.62 

0.45 

20.3±0.1 

15.24 

0.75±0.1


STRATUM III & IIIE OCXO 


FEATURES 

10 to 25 MHz 

Stratum IIIE compliant over -40 to 85°C 

Stratum III compliant over -40 to 85°C 

APPLICATIONS 

Stratum III & Stratum IIIE 


Vcc 1 

Output 2 

GND 3 

N.C. 4 

N.C. 5 



Standard frequencies 12.8, 16.384, 19.44 20 & 25 MHz 






duty cycle @ 2.5 V 40/60...60/40 % 40/60...60/40 % 





@ 100 Hz -140 dBc/Hz -140 dBc/Hz 



FREQUENCY STABILITY detailed tolerances after 30 days of operation 

type 

temperature 

range 

model 

code 


temperature Vcc ± 5 % ageing 

overall 

stability 

Holdover 

stability 

24 hrs 

drift 

calibration 

@ 25°C 

Telcordia GR-1244 CORE Stratum III/IIIE or ITU-T G.813 option 1 

all types 

DEFINITIONS 

-20 to 70°C CS3 

-40 to 85°C ES3 

0 to 70°C BS3E 

-40 to 85°C ES3E 

≤ ± 0.28 

ppm 

≤ ± 1 x 

10E-8 

≤ ± 1 x 

10E-8 

≤ ± 2.5 x 

10E-9 

≤ ± 3.5 

ppm/ 

15 years 

≤ ± 3.5 

ppm/ 

15 years 

≤ ± 4.6 

ppm/ 

15 years 

≤ ± 4.6 

ppm/ 

15 years 

≤ ± 0.37 

ppm 

≤ ± 12 x 

10E-9 

≤ ± 4 x 

10E-8 

≤ ± 1 x 

10E-9 

≤ ± 5 x 

10E-7 

≤ ± 5 x 

10E-7 

24 hours drift GR-1244-CORE 

24 hours holdover mode Over full temperature range and Vcc ± 1 % (CS3 & ES3), and Vcc ± 0.25 % (BS3E) 


Example DFO 20-LH 12.8 MHz BS3E 

TYPE DFO 20 SIII REVISION 03 CHECKED NE DATE .18.10.2007 PAGE xx 

20.3±0.1 

H 

5.1 

15.24 

0.45 

1 2 

5 

20.3±0.1 

7.62 7.62 

3 

4 

0.4±0.1 

H = 11mm


HIGH STABILITY MINIATURE OCXO 


FEATURES 

10 to 30 MHz 

Low profile package 

Tight stability 

APPLICATIONS 



Vcc 1 

Output 2 

GND 3 

N.C. or V. control 4 

N.C. 5 



Standard frequencies 10, 12.8 & 19.44 MHz 






duty cycle @ 2.5 V 40/60...60/40 % 40/60...60/40 % 





@ 100 Hz -125 dBc/Hz -125 dBc/Hz 



FREQUENCY STABILITY detailed tolerances 

type 

temperature 

range 

model 


stability versus : 

ageing/day ageing/ 1 

Calibration 

st year short term @ 25°C 

DFO 20 -20 to 70°C C1727 ≤ ± 1 x 10 E -7 ≤ 1.5 x 10 E -8 ≤ 2 x 10 E -7 ≤ 1 x 10 E -10 ≤ ± 0.5 x 10 E -6 

stability versus supply voltage ≤ 1 x 10 E -8 for Vcc ± 5 % 

OPTIONS CODE 

external voltage V 2.5 V ± 2.25 V ≥ ± 2 ppm, positive slope 1.65 V ± 1.5 V ≥ ± 2 ppm, positive slope 


Example DFO 20-LHV 10 MHz C1727 

TYPE DFO 20I REVISION 00 CHECKED NE DATE 22.02.2005 PAGE xx 

20.3±0.1 

H 

5.1 

15.24 

0.45 

1 2 

5 

20.3±0.1 

7.62 7.62 

3 

4 

0.4±0.1 

H = 11mm

Oven Controlled Oscillators (OCXO)

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