ST1308 Series
3.3V CMOS Ultra Low Jitter, High Frequency
Voltage Controlled Crystal Oscillator (VCXO)
Actual Size = 9 x 14mm
Product Features
• Frequencies available between 38.88 and 125 MHz
• High frequency fundamental-mode crystal
• No internal PLL or frequency multiplication
• Less than 0.5 ps RMS jitter
• LVCMOS compatible output
• Commercial and industrial operation
• ±20 ppM stability (or as specified)
• ±50 ppM absolute (net) pull range
• 9x14mm true SMT design
Package Outline
Pin Functions
Pad
Function
Control voltage
Output Enable/Disable
Ground
Output
No Connect
Supply voltage
1
2
3
4
5
Pad 1
Pad 6
2
5
3
4
6
Full Mechanical Drawings page 6.
Dimensions are in mm/inches.
Product Description
The ST1308 is a voltage controlled crystal oscillator
that achieves superb jitter and temperature stability
over a broad range of operating conditions and
frequencies. The device is constructed with a
hermetically sealed, fundamental-mode quartz crystal
resonator exhibiting a high-Q for exceptional phase
noise performance. The device, available on tape and
reel, is contained in a 9x14mm leadless FR4 package.
Common Frequencies
38.8800
62.5000
74.2500
100.0000
125.0000
51.8400
65.5360
75.0000
106.2500
54.0000
74.1758
77.7600
108.0000
Applications
The ST1308 Series VCXO is an ideal component
in phase locked loop circuits that perform clock
smoothing, clock/data recovery, or frequency
translation and card synchronization functions,
supporting jitter-sensitive applications such as:
• SMPTE-compliant Video networking
• SONET/SDH timing control and line cards
• Gigabit Ethernet and FibreChannel
• Satellite and microwave communications
• Server & Storage platforms
Ordering Information
SaRonix
Model
Stability Tolerance
AA = ±20ppm, 0 to +70°C
A = ±25ppm, 0 to +70°C
B = ±50 ppm, 0 to +70°C
E = ±50 ppm, -40 to +85°C
G = ±50 ppm, 0 to +85°C
Packaging
blank = bulk packaged
(T) = Tape & Reel*
*full reel increments only (500pcs)
Frequency (MHz)
Linearity
B = 10%
Pullability
(minimum APR)
A = ±50 ppm
Pericom Semiconductor Corporation • 1-800-435-2336 • http://www.pericom.com/saronix
1
All specifications are subject to change without notice.
DS 244 Rev B | 01/05/05
ST1308 Series
3.3V CMOS Ultra Low Jitter, High Frequency
Voltage Controlled Crystal Oscillator (VCXO)
Electrical Performance
Parameter
Min.
Typ.
Max.
Units
Notes
Output frequency (F
N
)
Supply voltage
Supply current
Frequency stability
Operating temperature
Output logic 0, V
OL
Output logic 1, V
OH
Output load
Duty cycle
Rise and fall time
Jitter, phase
Jitter, accumulated
Jitter, total
Phase Noise
Phase Noise
Phase Noise
Phase Noise
Phase Noise
38.88
3.135
±20
-40
2.4
3.3
125
3.465
30
±50
+85
0.4
20
MHz
V
mA
ppM
°C
V
V
pF
%
ns
ps RMS (1-σ)
ps RMS (1-σ)
ps
pk-pk
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
As specified
See #1 below
As specified
I
OL
= 2mA max
I
OH
= -2mA max
measured 1.4V
measured 10/90%
12kHz to 40MHz frequency band
20,000 adjacent periods
100,000 random periods
10 Hz offset
100 Hz offset
1 kHz offset
10 kHz offset
100 kHz offset
45
55
3
0.5
3.5
25
-60
-85
-115
-140
-150
Notes:
1. As specified. Stability includes all combinations of operating temperature, load changes, rated input (supply) voltage changes, aging
(5 years at 40°C average ambient temperature), shock and vibration.
Frequency Modulation Function
Parameter
Min.
Typ.
Max.
Units
Notes
Absolute pull range (APR)
Control voltage range
Center control voltage
Monotonic linearity
Input impedance
Modulation bandwidth
±50
0.3
1.32
50
10
1.65
3.0
1.98
10
ppM
V
DC
V
%
kΩ
kHz
See #1 below
As rated
For RMT center frequency
Positive transfer slope
Control voltage pin
-3dB
Notes:
1. APR is relative to the nominal output frequency F
N
(as specified); APR is inclusive (net) of frequency deviation due to stability.
Pericom Semiconductor Corporation • 1-800-435-2336 • http://www.pericom.com/saronix
2
All specifications are subject to change without notice.
DS 244 Rev B | 01/05/05
ST1308 Series
3.3V CMOS Ultra Low Jitter, High Frequency
Voltage Controlled Crystal Oscillator (VCXO)
Output Enable / Disable Function
Parameter
Min.
Typ.
Max.
Units
Notes
Input voltage, output enable
Input voltage, output high impedance
Output disable delay
Internal pullup resistance
2.2
0.8
100
50
V
V
ns
kΩ
Typical Phase Noise
Pericom Semiconductor Corporation • 1-800-435-2336 • http://www.pericom.com/saronix
3
All specifications are subject to change without notice.
DS 244 Rev B | 01/05/05
ST1308 Series
3.3V CMOS Ultra Low Jitter, High Frequency
Voltage Controlled Crystal Oscillator (VCXO)
Typical Temperature and Pull Characteristics
Performance over Temperature
150
Frequency Deviation (ppM)
100
50
0
-50
-100
-150
Temperature (C)
0
10
20
30
40
50
60
70
VC=+1.65V
VC=+0.3V
VC=+3.0V
Absolute Maximum Ratings
Parameter
Min.
Typ.
Max.
Units
Notes
Storage temperature
Control voltage range
-55
0
+125
V
CC
°C
V
Test Circuit
mA
M
6
5
2
4
3
Test Point
POWER
SUPPLY
V
M
0.01µF
1
20pF (incl.
probe and
fixture
capacitance)
Control Voltage
Output Control
Pericom Semiconductor Corporation • 1-800-435-2336 • http://www.pericom.com/saronix
4
All specifications are subject to change without notice.
DS 244 Rev B | 01/05/05
ST1308 Series
3.3V CMOS Ultra Low Jitter, High Frequency
Voltage Controlled Crystal Oscillator (VCXO)
Output Waveform
t
f
VOH
t
r
90%
1.4V
10%
VOL
t
A
Duty cycle = 100%
x
(t
A
)
/
(t
A
+
t
B
)
t
B
Solder Reflow Guide
Temperature – ˚C
250
200
150
Reflow 235 ±5˚C
4˚C/sec max
Preheat 183 ±10˚C
Cooling
4˚C/sec max
Time
1 – 2 minutes
5 sec min
10 sec max
Reliability Test Ratings
This product is rated under the following test conditions:
Type
Parameter
Test Condition
Mechanical
Mechanical
Mechanical
Mechanical
Environmental
Environmental
Environmental
Environmental
Shock
Solderability
Terminal strength
Solvent resistance
Thermal shock
Moisture resistance
Vibration
Resistance to soldering heat
MIL-STD-883, Method 2002, Condition B
MIL-STD-883, Method 2003
MIL-STD-883, Method 2004, Condition D
MIL-STD-202, Method 215
MIL-STD-883, Method 1011, Condition A
MIL-STD-883, Method 1004
MIL-STD-883, Method 2007, Condition A
MIL-STD-202, Method 210, Condition I or J
Pericom Semiconductor Corporation • 1-800-435-2336 • http://www.pericom.com/saronix
5
All specifications are subject to change without notice.
DS 244 Rev B | 01/05/05
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