FREQUENCY CONTROL PRODUCTS
SURFACE MOUNT MINIATURE TCXO
TYPES DFA S7-KHZ (5 V) & DFA S7-LHZ (3.3 V)
19.9± 0.1
RECOMMENDED FOR NEW DESIGNS
12.9± 0.2
7.62
SURFACE MOUNTABLE PACKAGE
5 V OR 3.3 V SUPPLY VOLTAGE
TIGHT STABILITY
Option Y
Pot in
1.27
1.6
18.4
1.2
Function
NC / Pot in / Vco
GND
N/C
Output
Vcc
E/D
DFA S7
1
2
3
4
5
6
10k
19.0
G
nd
7.62
1.3
7.8± 0.1
5
6
1
2.6
4
3
2
PC board footprint
TYPE
Frequency Range
DFA S7-KHZ
2 to 50 MHz
5V±5%
≤
20 mA
≤
30 mA
≤
40 mA
HCMOS 15 pF
or 2 TTL
≤
45/55...55/45 %
≤
10 ns
≥
3.5 V/
≤
0.5 V
≤
10 ms @ 4.75V
DFA S7-KOZ
2 to 50 MHz
5V±5%
≤
20 mA
≤
30 mA
≤
40 mA
clipped sine
20kΩ//5 pF
≥
2 V p-p
DFA S7-LHZ
2 to 45 MHz
3.3 V ± 5 %
≤
10 mA
≤
15 mA
≤
20 mA
HCMOS 15 pF
or 1 TTL
≤
45/55...55/45 %
≤
10 ns
≥
2.7 V/
≤
0.2 V
DFA S7-LOZ
2 to 45 MHz
3.3 V ± 5 %
≤
10 mA
≤
15 mA
≤
20 mA
clipped sine
20kΩ//5 pF
≥
1.5 V p-p
ELECTRICAL SPECIFICATIONS
supply voltage
supply current ( no load)
≤
25 MHz
≤
35 MHz
> 35 MHz
output load
duty cycle @ 2.5V (LH @ 1.65 V)
rise/fall times (10 to 90 %)
high/low levels or output amplitude
start-up
tri-state control on pin 6
remarks
≤
10 ms @ 4.75V
≤
10 ms @ 3.15V
≤
10 ms @ 3.15V
High or open = enable, low = high Z
duty cycle for frequencies > 30 MHz is 40/60%…60/40%
FREQUENCY STABILITY
type
temperature
range
-10 to 60°C
-20 to 70°C
-30 to 75°C
-40 to 85°C
model
code
D1
C1
C2
N2
E3
temperature
≤
±1
≤
±1
≤
±2
≤
±2
≤
±3
detailed tolerances [ ppm ]
stability versus :
Vcc range
load ± 10 %
≤
± 0.1
≤
± 0.1
Ageing
≤
±1
≤
±1
all types
DFA S7-K type
remarks
≤
± 0.1
≤
± 0.1
factory calibration if no trimming option
≤
± 1 ppm
st
ageing is 1 year at 25°C
OPTIONS
external voltage control
internal trimmer
external potentiometer
CODE
V
A
Y
DFA S7-K : 2.5 V ± 2 V
≥
± 5 ppm, positive slope
DFA S7-L : 1.5 V ± 1.5 V
≥
± 5 ppm, positive slope
≥
± 5 ppm
10 kΩ
≥
± 5 ppm, between pin 1 and GND (not available with internal trimmer)
ORDERING CODE
Example
type + option code + frequency + model code
DFA S7-KHZ 16.384 MHz E3
web site :
http://www.fordahl.com
嵌入式系统
