FREQUENCY CONTROL PRODUCTS
S T R A T U M I I I & I I I E O C X O
T Y P E S D F O 2 0 - K H ( 5 V ) & D F O 2 0 - L H ( 3 . 3 V )
20.3±0.1
FEATURES
7.62 7.62
10 to 25 MHz
Stratum IIIE compliant over -40 to 85°C
Stratum III compliant over -40 to 85°C
APPLICATIONS
1
5
2
3
4
Stratum III & Stratum IIIE
Function
Vcc
Output
GND
N.C.
N.C.
DFO 20
H = 11mm
1
2
3
4
5
0.45
TYPE
DFO 20-KH
DFO 20-LH
Frequency Range
10 to 25 MHz
Standard frequencies
12.8, 16.384, 19.44 20 & 25 MHz
ELECTRICAL SPECIFICATIONS
supply voltage
5 V ± 5 %
3.3 V ± 5 %
supply current (no load) @ 25°C
supply current during warm up
≤ 250 mA
≤ 500 mA
≤ 300 mA
≤ 800 mA
output load
HCMOS 15 pF or 2 TTL
40/60...60/40 %
≤ 10 ns
HCMOS 15 pF or 2 TTL
40/60...60/40 %
≤ 10 ns
duty cycle @ 2.5 V
rise & fall times (10 to 90%)
high/low levels
≥ 4.5 V/≤ 0.5 V
≥ 2.7 V/≤ 0.5 V
SSB phase noise (1 Hz BW)
(typical @ 12.8MHz)
@
@
1 Hz
10 Hz
-95 dBc/Hz
-120 dBc/Hz
-140 dBc/Hz
-145 dBc/Hz
-95 dBc/Hz
-120 dBc/Hz
-140 dBc/Hz
-145 dBc/Hz
@ 100 Hz
1 kHz
@
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 after 30 days of operation
temperature
range
model
code
stability versus:
temperature Vcc ± 5 %
overall
stability
Holdover
stability
24 hrs
drift
calibration
@ 25°C
type
ageing
Telcordia GR-1244 CORE Stratum III/IIIE or ITU-T G.813 option 1
≤ ± 3.5
≤ ± 4.6
-20 to 70°C CS3
-40 to 85°C ES3
0 to 70°C BS3E
-40 to 85°C ES3E
≤ ± 0.28
≤ ± 1 x
≤ ± 0.37
≤ ± 4 x
≤ ± 5 x
ppm/
ppm/
ppm
10E-8
ppm
10E-8
10E-7
15 years 15 years
all types
≤ ± 3.5
ppm/
15 years 15 years
≤ ± 4.6
ppm/
≤ ± 1 x
10E-8
≤ ± 2.5 x
10E-9
≤ ± 12 x
10E-9
≤ ± 1 x
10E-9
≤ ± 5 x
10E-7
DEFINITIONS
24 hours drift
GR-1244-CORE
24 hours holdover mode
Over full temperature range and Vcc ± 1 % (CS3 & ES3), and Vcc ± 0.25 % (BS3E)
ORDERING CODE
type + option code + frequency + model code + voltage value
Example
DFO 20-LH 12.8 MHz BS3E
TYPE
DFO 20 SIII
REVISION
03
CHECKED
NE
DATE
.18.10.2007 PAGE
xx