357 Beloit Street, P.O. Box 457, Burlington, WI 53105-0457 U.S.A. Phone 262/763-3591 FAX 262/763-2881
Email:
nelsales@nelfc.com
www.nelfc.com
Differential Positive ECL (DPECL)
Fast Edge
SD-A2990 Series
PRELIMINARY
Description
The SD-A2990 Series of quartz crystal oscillators provide DPECL Fast Edge compatible signals. Systems
designers may now specify space-saving, cost-effective packaged PECL oscillators to meet their timing
requirements.
Features
· Wide frequency range125.0MHz to 312.5MHz
· User specified tolerance available
· Will withstand vapor phase temperatures of 253°C
for 4 minutes maximum
· Space-saving alternative to discrete component
oscillators
· High shock resistance, to 1000g
· 3.3 volt operation
· Metal lid electrically connected to ground to
reduce EMI
· Fast rise and fall times <600 ps
· High Reliability - NEL HALT/HASS qualified for
crystal oscillator start-up conditions
· Low Jitter - Wavecrest jitter characterization
available
· Overtone technology
· High Q Crystal actively tuned oscillator circuit
· Power supply decoupling internal
· No internal PLL avoids cascading PLL problems
· High frequencies due to proprietary design
· Gold plated pads
Electrical Connection
Pin Connection
1 Enable/Disable
2 N.C.
3 V
EE
/Ground
4 Output
5 /Output
6 V
CC
CRYSTAL CLOCK OSCILLATORS
Data Sheet 0331A
Rev. -
357 Beloit Street, P.O. Box 457, Burlington, WI 53105-0457 U.S.A. Phone 262/763-3591 FAX 262/763-2881
Email:
nelsales@nelfc.com
www.nelfc.com
SD-A2990 Series Continued
Differential Positive ECL (DPECL)
Fast Edge
Operating Conditions and Output Characteristics
Electrical Characteristics
Parameter
Symbol
Conditions
Min
Typical
Max
Frequency
-----
-----
125.0MHz -----
312.5MHz
Duty Cycle -----
@ V
CC
-1.29V
45/55% -----
55/45%
Logic 0
(2)
V
OL
-----
1.35V
-----
1.70V
Logic 1
(2)
V
OH
-----
2.28V
-----
2.56V
Rise & Fall Time
tr,tf 20-80%V
O
with 50 ohm load to V
CC
-2V ----- -----
600 psec
T
pd
(4)
-----
-----
-200 psec
-----
+200 psec
Jitter, RMS
(3)
-----
-----
-----
-----
3 psec
Enable Voltage
-----
with V
EE
= 0V
2.0V
-----
-----
Disable Voltage
-----
with V
EE
= 0V
-----
-----
0.8V
Frequency Stability
(1)
dF/F
Overall conditions including:
-100ppm
-----
+100ppm
voltage, calibration, temp.,
10 yr aging, shock, vibration
General Characteristics
Parameter
Symbol
Conditions
Min
Typical
Max
Supply Voltage
V
CC
-----
3.15V 3.3V
3.45V
Supply Current
I
CC
50 ohm termination
0.0 mA
-----
80 mA
To 2.00V below V
CC
Output current
I
O
Low level Output Current 0.0 mA -----
±50.0 mA
Operating temperature
T
A
------
0°C -----
70°C
Storage temperature
T
S
----- -55°C -----
125°C
Power Dissipation
P
D
-----
-----
-----
276 mW
Lead temperature
T
L
Soldering, 10 sec. ----- -----
300°C
Load
50 Ohm to V
CC
-2V or Thevenin Equivalent, Bias Required
Start-up time
t
S
-----
-----
2 ms
10 ms
Environmental and Mechanical Characteristics
Mechanical Shock
Per MIL-STD-202, Method 213, Condition E
Thermal Shock
Per MIL-STD-833, Method 1011, Condition A
Vibration
0.060" double amplitude 10 Hz to 55 Hz, 35g's 55Hz to 2000 Hz
Soldering Condition
300°C for 10 seconds
Hermetic Seal
Leak rate less than 1 x 10
-8
atm.cc/sec of helium
Footnotes:
1) Standard frequency stability (±20,±25,±50ppm & others available)
2) V
OL
, V
OH
, referenced to ground (V
EE
) with V
CC
= 3.3V
3) Jitter performance is frequency dependent. Please contact factory for full Wavecrest characterization.
4) Tpd is phse shift between the falling edge of pin 4 at 2.0V and the rising edge of pin 5 at 2.01V.
Rev. -
CRYSTAL CLOCK OSCILLATORS
SD - A299X - FREQ
Package Code
Tolerance/Performance
SD 6 pad 5x7mm SMD
0 ±100ppm 0-70°C
1 ±50ppm 0-70°C
7 ±25ppm 0-70°C
Input Voltage
9 Customer Specific
Code Specification
A ±20ppm 0-70°C
A 3.3V
B ±50ppm -40 to +85°C
B 2.5V
C ±100ppm -40 to +85°C
5V
Creating a Part Number
Data Sheet 0331A
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