VS-751
Dual Frequency VCSO
Features
5 x 7.5 x 2.5 mm Package
Output Frequencies from 500 MHz to 850 MHz
3.3 V Operation
Low Jitter < 0.25 ps-rms across 50 kHz to 80 MHz
LV-PECL Configuration with Fast Transition Times
Complementary Outputs
Frequency Select
Patent Pending Technology
Pb
Product is free of lead and compliant to
EC RoHS Directive
Applications
PLL circuits for Clock Smoothing and Frequency Translation
Description
1-2-4 Gigabit Fibre Channel
10 Gigabit Fibre Channel
10GbE LAN / WAN
OC-192
Vcc
COutput
Output
Standard
INCITS 352-2002
INCITS 364-2003
IEEE 802.3ae
ITU-T G.709
GR-253-CORE Issue3
SONET / SDH
SAW 1
SAW 2
Description
The VS-751 is a SAW based voltage controlled oscillator that
operates at the fundamental frequencies of the internal SAW
filters. These SAW filters are high-Q quartz devices that
enable the circuit to achieve low phase jitter performance over
a wide operating temperature range. The dual oscillator is
housed in a hermetically sealed leadless surface mount
package offered on tape and reel. It has a frequency select
function that enables either
“Frequency
1” or
“Frequency
2.”
Vc
FS
Gnd
Vectron International, 267 Lowell Rd, Hudson NH 03051-4916
Page 1 of 7
Tel: 1-88-VECTRON-1
Website: www.vectron.com
Rev: 09Jan06
VS-751 Voltage Controlled SAW Oscillator
Electrical Performance
Parameter
Frequency
Nominal Frequency
Absolute Pull Range
Linearity
Gain Transfer (See Pg 5)
Temperature Stability
Transition Time
Supply
Voltage
Current (No Load)
Outputs
Mid Level
Swing
Current
Rise Time
Fall Time
Symmetry
Spurious Suppression
Jitter (See Pg 5)
Control Voltage
Input Impedance
Modulation Bandwidth
Operating Temperature
Package Size
1.
2.
3.
4.
5.
6.
7.
8.
Symbol
f
N
APR
Lin
K
V
f
STAB
Minimum
Typical
500 - 850
Maximum
Units
MHz
ppm
%
ppm/V
ppm
sec
Notes
1,2,3
1,2,3,8
2,4,8
2,8
1,6
6
2,3
3
2,3
2,3
6
5,6
5,6
2,3
6
6,7
6
6
1,3
50
5
+405
100
4
2.97
3.3
55
V
CC
-1.3
650
250
250
50
60
0.130
100
500
-40
5.0 x 7.5 x 2.5
85
3.63
70
V
CC
-1.2
950
20
400
400
55
0.250
V
CC
I
CC
V
mA
V
mV-pp
mA
ps
ps
%
dBc
ps-rms
k
kHz
°C
mm
V
CC
-1.4
550
I
OUT
t
R
t
F
SYM
J
Z
C
BW
T
OP
45
50
See Standard Frequencies and Ordering Information (Pg 7).
Parameters are tested with production test circuit below (Fig 1).
Parameters are tested at ambient temperature with test limits guardbanded for specified operating temperature.
Measured as the maximum deviation from the best straight-line fit, per MIL-0-55310.
Measured from 20% to 80% of a full output swing (Fig 2).
Not tested in production, guaranteed by design, verified at qualification.
Integrated across 50 kHz to 80 MHz, per GR-253-CORE Issue3.
Tested with Vc = 0.3V to 3.0V.
Vc (-1.0V to +1.7V)
1
6
Vcc (+2V)
F1 (-0.58V ), F2 (+0.59V)
2
5
COutput
t
R
80%
t
F
SYM = 100 x t
A
/ t
B
Vcc - 1.0V
Vee (-1.3V)
3
4
Output
Vcc - 1.3V
50
50
20%
Vcc - 1.6V
Test Circuit Notes:
1) To Permit 50 Measurement of Outputs, all DC Inputs are Biased Down 1.3V.
2) All Voltage Sources Contain Bypass Capacitors to Minimize Supply Noise.
3) 50 Terminations are Within Test Equipment.
t
A
t
B
Figure 1. Test Circuit
Figure 2. 10K LV-PECL Waveform
Vectron International, 267 Lowell Rd, Hudson NH 03051-4916
Page 2 of 7
Tel: 1-88-VECTRON-1
Website: www.vectron.com
Rev: 09Jan06
VS-751 Voltage Controlled SAW Oscillator
Outline Diagram
6
5
4
Pad Layout
6.76
[0.266]
5.10±0.15
[0.201±0.006]
VS751LG
XX - XX
VI YWW
1
2
7.50±0.15
[0.295±0.006]
3
0.86
[0.034]
1.68
[0.066]
0.68
[0.027]
1.30
[0.051]
2.49±0.18
[0.098±0.007]
1.70
[0.067]
3.83
5.54
[0.151] [0.218]
R0.15
[R0.006]
1.27
[0.050]
Y = Year
WW = Week
XX = Frequency Code
(See Ordering Info)
mm
[inch]
2.54
[0.100]
5.08
[0.200]
mm
[inch]
1.27
[0.050]
2.54
[0.100]
4X R0.19
[R0.007]
Pin Out
Pin
1
2
3
4
5
6
Marking Key
Symbol
V
C
FS
Gnd
Output
COutput
V
CC
Function
VCSO Control Voltage
Frequency Select (See Control Logic)
Case and Electrical Ground
VCSO Output
VCSO Complementary Output
Power Supply Voltage (3.3 V
10%)
Position 6
L = LFF
Position 7
G = GNN
H = HNN
Control Logic (LV-CMOS)
FS
0
1
Operation
F1
F2
Tape and Reel (EIA-481-2-A)
Po
ØDo
W2
F
W
D
C
N
A
P1
W1
B
Tape Dimensions (mm)
Dimension
Tolerance
VS-751
Reel Dimensions (mm)
F
Do
Typ
1.5
W
Typ
16
Po
Typ
4
P1
Typ
8
A
Typ
178
B
Min
1.5
C
Typ
13
D
Min
20.2
N
Min
50
W1
Typ
16.4
W2
Max
22.4
Typ
7.5
# Per
Reel
200
Vectron International, 267 Lowell Rd, Hudson NH 03051-4916
Page 3 of 7
Tel: 1-88-VECTRON-1
Website: www.vectron.com
Rev: 09Jan06
VS-751 Voltage Controlled SAW Oscillator
Absolute Maximum Ratings
Parameter
Power Supply
Input Current
Output Current
Voltage Control Range
Storage Temperature
Soldering Temperature / Duration
Symbol
V
CC
I
IN
I
OUT
V
C
T
STR
T
PEAK
/ t
P
Ratings
0 to 6
100
25
0 to V
CC
-55 to 125
260 / 40
Unit
V
mA
mA
V
C
C / sec
Stresses in excess of the absolute maximum ratings can permanently damage the device. Also, exposure to
these absolute maximum ratings for extended periods may adversely affect device reliability. Functional
operation is not implied at these or any other conditions in excess of those represented in the operational
sections of this datasheet. Permanent damage is also possible if any device input (Vc or FS) draws greater
than 100mA.
Suggested Output Load Configurations
+3.3V
0.10 F
0.01 F
0.10 F
0.01 F
150
150
+3.3V
+3.3V
Vc
FS
Gnd
1
2
6
5
Vcc
COutput
Output
Z = 50
Z = 50
100
Vc
FS
Gnd
1
2
6
5
Vcc
COutput
Output
Z = 50
Z = 50
40
40
3
4
3
4
49
49
240
240
LV-PECL to LV-PECL:
For short transmission lengths, the power
c onsumption could be reduced by removing the 100 resistor and
doubling the value of the pull down resistors.
+3.3V
0.10 F
0.01 F
LV-PECL to LVDS:
Restricted for short transmission lengths.
Configuration may require modification depending on LVDS receiver.
+2.0V
0.10 F
0.01 F
Vc
FS
Gnd
1
2
3
6
5
4
Vcc
COutput
Output
0.01 F
Vc
FS
0.01 F
-1.3V
1
2
3
6
5
4
Vcc
COutput
Output
240
240
Functional Test:
Allows standard power supply configuration.
Since AC coupled, the LV-PECL levels cannot be measured.
Production Test:
Allows direct DC coupling into 50 measurement
equipment. Must bias the power supplys as shown. Similar to Figure 1.
Vectron International, 267 Lowell Rd, Hudson NH 03051-4916
Page 4 of 7
Tel: 1-88-VECTRON-1
Website: www.vectron.com
Rev: 09Jan06
VS-751 Voltage Controlled SAW Oscillator
Typical Characteristics
800
At Ambient (22.5 C)
600
400
200
0
-200
-400
-600
-800
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
Typical Gain Transfer @ 622.0800 = +415 ppm/V
Typical Gain Transfer @ 644.5313 = +399 ppm/V
622 Vc Pull
644 Vc Pull
y = 415.29x - 605.56
y = 398.69x - 578.48
Linear (622 Vc Pull)
Linear (644 Vc Pull)
Control Voltage (V)
-95
Typical Calculated Jitter @ Vc = 1.65V
-100
-105
-110
1/f
-115
-120
1/f
-125
-130
-135
-140
-145
-150
-155
10
100
1,000
10,000
1/f
1
2
OC-192 Spec
F1 = 622
F2 = 644
SONET OC-48 (12kHz-20MHz) = 0.23 ps-rms; 1.61 ps-pp
SONET OC-192 (50kHz-80MHz) = 0.13 ps-rms; 0.91 ps-pp
3
OC-192 Spec Equivalent to
0.25 ps-rms @ 500 MHz
100,000
Offset (kHz)
Vectron International, 267 Lowell Rd, Hudson NH 03051-4916
Page 5 of 7
Tel: 1-88-VECTRON-1
Website: www.vectron.com
Rev: 09Jan06
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