Product Data Sheet
VS-500A
Voltage Controlled Saw Oscillator
Features
• Output Frequencies from 155 MHz to 800 MHz
• Low Jitter < 1 ps rms in the 12kHz to 20MHz range
• < 1ps rms jitter in 50kHz to 80MHz range
•
3.3V (see VS-500) or 5.0V operation
• Ideal for clock smoothing, frequency translation, clock
and data retiming applications
• 10K ECL, PECL logic levels with fast transition times
• Complementary outputs
• Low profile, surface mount package
• Output disable feature
Applications
• 2.5, 10 Gbit/s FEC and standard SONET/SDH Clock
Smoothing and Frequency Translation
• 10 Gigabit Ethernet Clock Smoothing
• Frequency Translation
Description
The VS-500A is a SAW based voltage controlled
oscillator that operates at the fundamental frequency of
the internal SAW filter. This resonator is a high-Q quartz
device that enables the circuit to achieve low phase
jitter performance over a wide operating temperature
range. The oscillator is housed in a hermetically sealed
J-lead surface mount package offered on tape and reel.
It has an output disable to facilitate on-board testing.
VS-500A Voltage Controlled SAW Oscillator
Pin Information
Table 1. Pin Function
Pin
1
2
3
4
5
6
Symbol
V
C
OD
GND
Output
COutput
V
CC
Function
VCSO Control Voltage
Output Disable
Case and electrical ground
VCSO Output
VCSO Complimentary Output
Power Supply Voltage (5.0 V ±10%)
1. By setting OD low, the outputs are disabled and OUT is held high while Complementary OUT is held low. The threshold for Output Disable is 1.4V
above pin 3. Output Disable should not be driven above mid supply and during normal operation, should be left floating (use with an open collector or
3-State gate for interfacing with standard logic).
Performance Characteristics
Table 2. Electrical Performance @ 25°C
Parameter
Center Frequency,
see ordering information
Operating Temperature
Supply Current (no load)
Supply Voltage
Absolute Pull Range over -40 to 85°C
(Vc= 0.5 to 4.5)
Positive Gain Transfer @ 155.52MHz
(Frequency vs Control voltage)
Positive Gain Transfer @ 622.080MHz
(Frequency vs Control voltage)
Linearity
Frequency Stability, -40 to 85 wrt 25°C
Output Level Low
1
Output Level High
1
Output Rise Time
2
Output Fall Time
2
Jitter @ 155.520 MHz, 12 KHz to 20 MHz
Jitter @ 622.080 MHz, 12 KHz to 20 MHz
Jitter @ 622.080 MHz, 50 KHz to 80 MHz
Spurious Suppression
Data Symmetry
Control Voltage Input Impedance
Control Voltage Modulation Bandwidth
Output Current
SYM
Zc
BW
Iout
-50
45
8
-
-
Symbol
F
N
T
OP
I
CC
V
CC
APR
K
V
K
V
Lin
F
STAB
V
OL
V
OH
t
R
t
F
V
CC
-1.95
V
CC
-0.98
Minimum
155
-40
4.5
±50
-
-
Typical
25
55
5
-
350
200
±3
±150
-
-
250
250
0.439
0.276
0.293
-60
49/51
10
500
-
55
12
-
20
V
CC
-1.63
V
CC
-0.75
400
400
Maximum
800
+85
70
5.5
-
-
-
Units
MHz
°C
mA
V
ppm
ppm/V
ppm/V
%
ppm
V
V
ps
ps
ps, rms
ps, rms
ps, rms
dB
%
KΩ
kHz
mA
1. Output Levels are standard 10K ECL and are fully 100K ECL compatible.
2. Transition times are measured from 20% to 80% of a full 10K ECL level swing.
Table 3. Typical Single Side-Band Phase Noise (dBc/Hz)
Offset from Carrier
VS-500A 622.080
100 Hz
-62
1kHz
-85
10kHz
-109
100kHz
-127
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Fax: 1-888-FAX-VECTRON
2
VS-500A Voltage Controlled SAW Oscillator
+5.0V
.01uF
.1uF
(From PLL)
Vc
OD
Gnd
120
1
2
3
6
+5.0V +5.0V
120
Vcc
(AC Coupling)
5 COutput
Output
4
82
82
+5.0V
.01uF
.1uF
(From PLL)
Vc
OD
Gnd
1
2
3
6
Vcc
(AC Coupling)
5 COutput
Output
4
330
330
Note 2: To diasble output, connect Output Disable to ground. To enable output, leave pin 2 floating or open.
Figure 1
PECL Operation
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Fax: 1-888-FAX-VECTRON
3
VS-500A Voltage Controlled SAW Oscillator
-5.0V
-5.0V
(From PLL)
0.1uF
.01uF
Vc
OD
Gnd
120
1
2
3
6
120
Vcc
(AC Coupling)
5 COutput
Output
4
80
80
-5.0V
(From PLL)
0.1uF
.01uF
Vc
OD
Gnd
1
2
3
6
Vcc
(AC Coupling)
5 COutput
Output
4
330
330
-5.0V
-5.0V -5.0V
Note1: Conductive lid will be @ -5V for ECL configuration
Note 2: To diasble output, connect Output Disable to –5V. To enable output, leave pin 2 floating or open.
Figure 2. ECL Operation
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Fax: 1-888-FAX-VECTRON
4
VS-500A Voltage Controlled SAW Oscillator
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can permanently damage the device. Functional operation is not implied at these or any
other conditions in excess of conditions represented in the operational sections of this data sheet. Exposure to absolute maximum ratings for
extended periods may adversely affect device reliability.
Table 4. Absolute Maximum Ratings
Parameter
Power Supply
Output Current
1
Output Current
2
Voltage Control Range
1
Voltage Control Range
2
Storage Temperature
Soldering Temp./Time
Symbol
V
CC
Iout
Iout
V
C
V
C
T
S
T
LS
Ratings
0 to 8
20
50
0 to V
CC
-0.5 to V
CC
+0.5
-55 to 125
220/10
Unit
V
mA
mA
V
V
°C
°C/Seconds
1 Limts beyond which performance can not be guaranteed.
2 Limits beyond which device life may be impaired.
Qualification Conformance
The VS-500A family passes the following Mil-Std qualification.
Table 5. Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Solderability
Gross and Fine Leak
Resistance to Solvents
Conditions
MIL-STD-883,
MIL-STD-883,
MIL-STD-883,
MIL-STD-883,
MIL-STD-883,
Method
Method
Method
Method
Method
2002
2007
2003
1014
2016
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Fax: 1-888-FAX-VECTRON
5
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