Suggested Output Load Configurations
The VX-702 incorporates a standard PECL output scheme, which are un-terminated emitters as shown in Figure 3. There are numerous application notes
on terminating and interfacing PECL logic and the two most common methods are a single resistor to ground, Figure 4, and a pull-up/pull-down scheme
as shown in Figure 5. An AC coupling capacitor is optional, depending on the application and the input logic requirements of the next stage.
One of the most important considerations is terminating the Output and Complementary Outputs equally. An unused output should not be left un-termi-
nated, and if it one of the two outputs is left open it will result in excessive jitter on both. PC board layout must take this and 50 ohm impedance matching
into account. Load matching and power supply noise are the main contributors to jitter related problems.
Figure 4 Single Resistor Termination Scheme
Figure 5 Pull-Up Pull-Down Termination
Figure 3 Standard PECL Output Configuration
Resistor values are typically 120 to 240 ohms
Reliability
VI qualification includes aging at various extreme temperatures, shock and vibration, temperature cycling, and IR reflow
simulation. The VX-702 family is capable of meeting the following qualification tests:
Table 3. Environmental Compliance
Parameter
Conditions
Mechanical Shock
MIL-STD-883, Method 2002
MIL-STD-883, Method 2007
MIL-STD-883, Method 2003
MIL-STD-883, Method 1014
MIL-STD-883, Method 2015
MSL 1
Typical Characteristics - Phase Noise
Mechanical Vibration
Solderability
Gross and Fine Leak
Resistance to Solvents
Moisture Sensitivity Level
Contact Pads
Gold over Nickel
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 datasheet.
Exposure to absolute maximum ratings for extended periods may adversely affect device reliability. Permanent damage is
also possible if OD or Vc is applied before Vcc.
Table 4. Absolute Maximum Ratings
Parameter
Power Supply
Symbol
VDD
Ratings
0 to 6
Unit
V
Output Current
IOUT
25
mA
V
Voltage Control Range
Storage Temperature
Soldering Temp/Time
VC
0 to VCC
-55 to 125
260 / 40
TS
°C
TLS
°C / sec
Although ESD protection circuitry has been designed into the VX-702 proper precautions should be taken when handling
and mounting. VI employs a human body model (HBM) and a charged device model (CDM) for ESD susceptibility testing
and design protection evaluation.
Table 5. ESD Ratings
Model
Human Body Model
Minimum
500V
Conditions
MIL-STD-883, Method 3015
JESD22-C101
Charged Device Model
500V
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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