FREQUENCY CONTROL PRODUCTS
HIGH STABILITY SMALL SIZE TCXO
DFA 20
OPTIONAL EXTERNAL VOLTAGE CONTROL
VERY HIGH OVERALL STABILITY
20.3±0.1
20.3±0.1
7.62 7.62
STANDARD PACKAGE
LOW AGEING
1
15.24
2
3
Option Y
Pot in
5
4
10k
Vcc
Output
GND
GND/Pot in/Vco
GND
1
2
3
4
5
5.1 9.7±0.1
0.45
TYPE
Frequency Range (MHz)
DFA 20-H
1 to 27
DFA 20-MH
25 to 40
DFA 20-S
4 to 27
0.4±0.1
Function
DFA 20
Gnd
DFA 20-O
1 to 27
ELECTRICAL SPECIFICATIONS
supply voltage
supply current ( no load)
≤
25 MHz
> 25 MHz
5 to 15 V ± 5 %
≤
7 mA
≤
30 mA
HCMOS 15 pF or 2 TTL
≤
40/60...60/40 %
≤
10 ns
≥
3.5/
≤
0.5 V
≤
10 ms
5 to 15 V ± 5 %
≤
20 mA
≤
30 mA
Sine 50
Ω
± 10 %
5 to 15 V ± 5 %
≤
7 mA
≤
10 mA
clipped sine
20 kΩ//5 pF
≥
2 V p-p
≤
10 ms
output load
duty cycle @ 2.5 V
rise/fall times
high/low levels or output amplitude
start-up
0 dBm ± 2 dB
≤
10 ms
FREQUENCY STABILITY
types
temperature
range
0 to 50°C
-10 to 60°C
model
code
A0.5
D1
C1
-20 to 70°C
C2
-30 to 75°C N2
-40 to 85°C E3
temperature
≤
± 0.5
≤
±1
≤
±1
≤
±2
≤
±2
≤
±3
detailed tolerances [ ppm ]
stability versus :
Vcc ± 5 %
load ± 10 %
ageing
all types
≤
± 0.1
≤
± 0.1
≤
±1
remarks
Factory calibration if no trimming option
≤
± 1 ppm
ageing is 1
st
year at 25°C
OPTIONS
external voltage
internal trimmer
external potentiometer
CODE
V
A
Y
2.5 ± 2 V
≥
± 5 ppm , positive slope
≥
± 5 ppm
10 kΩ
≥
± 5 ppm (not available with internal trimmer)
ORDERING CODE
Example
type + option code + frequency + model code/ voltage value
DFA 20-HA 12.288 MHz N2/5
TYPE
DFA 20
REVISION
01
CHECKED
JYA
DATE
24.01.2002
PAGE
57
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