VCC6_11 VECTRON [Vectron International, Inc], VCC6_11 Datasheet - Page 5

• Manufacturer Part Number: VCC6_11
• Description: Ultra Low Jitter Performance
• Manufacturer: VECTRON [Vectron International, Inc]

Figure 7. Standard PECL Output Confi guration Figure 8. Single Resistor Termination Scheme
The VCC6 incorporates a standard PECL output scheme, which are un-terminated emitters as shown in Figure 7. There are numerous application notes on
terminating and interfacing PECL logic and the two most common methods are a single resistor to ground, Figure 8, and a pull-up/pull-down scheme as
shown in Figure 9. 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 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 10 Standard LVDS
Output Confi guration
V
CC
OUT+
OUT-
Table 4. Environmental Compliance
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Some LVDS structures have an internal 100 ohm resistor on the
input and do not need additional components.
Figure 11. LVDS to LVDS Connection, Internal 100ohm
Moisture Sensitivity Level
Moisture Sensitivity Level
Resistance to Solvents
Mechanical Vibration
Fine and Gross Leak
Fine and Gross Leak
Temperature Cycle
Driver
Mechanical Shock
LVDS
Contact Pads
Solderability
Parameter
Environmental and IR Compliance
Resistor values are typically 140 ohms for
3.3V operation.
Resistor values are typically 84 ohms for 2.5V
operation.
LVDS Application Diagrams
LVPECL Application Diagrams
100
140Ω
Page5
Receiver
LVDS
140Ω
MIL-STD-883 Method 2002
MIL-STD-883 Method 2007
MIL-STD-883 Method 1010
MIL-STD-883 Method 2003
MIL-STD-883 Method 1014
MIL-STD-883 Method 2015
Gold over Nickel
Condition
Some input structures may not have an internal 100 ohm
resistor on the input and will need an external 100ohm
resistor for impedance matching. Also, the input may have
an internal DC bias which may not be compatible with
LVDS levels, AC blocking capacitors can be used.
MSL1
LVDS
Driver
Resistor values are typically for 3.3V operation
For 2.5V operation, the resistor to ground is 62
ohms and the resistor to supply is 240 ohms
Figure 9. Pull-Up Pull Down Termination
Figure 12. LVDS to LVDS Connection
External 100ohm and AC blocking caps
100
Receiver