VS-500A
Voltage Controlled Saw Oscillator
Features
•
Output Frequencies from 155 MHz to 800 MHz
•
Low Jitter < 1 ps rms in the 12 kHz to 20MHz range
•
< 1ps rms jitter in 50kHz to 80MHz range
•
J-Type, smallest 622.080 MHz package available
•
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
The VS-500A Voltage Controlled SAW Oscillator
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.
Vectron International 166 Glover Avenue, Norwalk CT 06856-5160
Tel:1-88-VECTRON-1
e-mail: vectron@vectron.com
VS-500A Voltage Controlled SAW Oscillator
Pin Information
Table 1. Pin Function
Pin
Symbol
1
V
C
2
OD
3
GND
4
Output
5
COutput
6
V
CC
Function
VCSO Control Voltage
Output Disable
Case and Electrical Ground
VCSO Output
VCSO Complementary Output
Power Supply Voltage (5.0 V
±10%)
6
5
4
TOP VIEW
1
2
3
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
Symbol
Minimum
Typical
Center Frequency,
see ordering information
F
N
155
Operating Temperature
T
OP
-40
25
Supply Current (no load)
I
CC
55
Supply Voltage
V
CC
4.5
5
APR
-
Absolute Pull Range over –40 to 85°C
±50
(Vc= 0.5 to 4.5)
Positive Gain Transfer @ 155.52
K
V
350
(Frequency vs. Control Voltage)
Positive Gain Transfer @ 622.080
K
V
200
(Frequency vs. Control voltage)
Linearity
Lin
±3
F
STAB
Frequency Stability, -40 to 85 wrt 25°C
±150
1
Output Level Low
V
OL
Vcc-1.95
-
1
Output Level High
V
OH
Vcc-0.98
-
2
Output Rise Time
t
R
250
2
Output Fall Time
t
F
250
Jitter @ 155.520 MHz, 12 kHz to 20 MHz
0.439
Jitter @ 622.080 MHz, 12 kHz to 20 MHz
0.276
Jitter @ 622.080MHz, 50 kHz to 80 MHz
0.293
Spurious Suppression
-50
-60
Data Symmetry
SYM
45
49/51
Control Voltage Input Impedance
Z
c
8
10
Control Voltage Modulation Bandwidth
BW
-
500
Output Current
I
OUT
-
-
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.
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
Vcc-1.63
Vcc-0.75
400
400
55
12
-
20
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 166 Glover Avenue, Norwalk CT 06856-5160
2
Tel:1-88-VECTRON-1
e-mail vectron@vectron.com
VS-500A Voltage Controlled SAW Oscillator
+5.0V
.01uF
.1uF
(From PLL)
Vc
OD
Gnd
1
2
3
+5.0V +5.0V
120
Ω
6
Vcc
120
Ω
5 COutput
Output
4
82
Ω
82
Ω
(AC Coupling)
+5.0V
.01uF
.1uF
(From PLL)
Vc
OD
Gnd
1
2
3
6
Vcc
(AC Coupling)
5 COutput
Output
4
330
Ω
330
Ω
Note :To disable output, connect Output Disable to ground. To enable output, leave pin 2 floating or open.
Figure 1 and 2
PECL Operation
Vectron International 166 Glover Avenue, Norwalk CT 06856-5160
3
Tel:1-88-VECTRON-1
e-mail vectron@vectron.com
VS-500A Voltage Controlled SAW Oscillator
-5.0V -5.0V
(From PLL)
0.1uF
.01uF
Vc
OD
Gnd
120
Ω
1
2
3
6
Vcc
120
Ω
5 COutput
Output
4
80
Ω
80
Ω
(AC Coupling)
-5.0V
(From PLL)
0.1uF
.01uF
Vc
OD
Gnd
1
2
3
6
Vcc
(AC Coupling)
5 COutput
Output
4
330
Ω
330
Ω
-5.0V
-5.0V -5.0V
Figure 2. ECL Operation
Note1: Conductive lid will be @ -5V for ECL configuration
Note2: To disable output, connect Output Disable to –5V. To enable output, leave pin 2 floating or open.
Vectron International 166 Glover Avenue, Norwalk CT 06856-5160
4
Tel:1-88-VECTRON-1
e-mail vectron@vectron.com
VS-500A Voltage Controlled SAW Oscillator
51.840MHz
φ
and Freq
Detector
Loop Filter
VS-500A
622.080MHz
622.080MHz
Divide by 12
Figure 3. Typical Frequency Translation Diagram
155.52MHz
155.52MHz
φ
and Freq
Detector
Loop Filter
VS-500A
155.520MHz
Figure 4. Typical Clock Smoothing Diagram
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
1
Output Current
2
Output Current
1
Voltage Control Range
2
Voltage Control Range
Storage Temperature
Soldering Temp/Time
Symbol
V
CC
Iout
Iout
V
C
V
C
TS
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 guarenteed.
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
Vectron International 166 Glover Avenue, Norwalk CT 06856-5160
5
Conditions
MIL-STD-883, Method 2002
MIL-STD-883, Method 2007
MIL-STD-883, Method 2003
MIL-STD-883, Method 1014
MIL-STD-883, Method 2016
Tel:1-88-VECTRON-1
e-mail vectron@vectron.com
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