LVDS Application Diagrams
VCC
LVDS
Driver
LVDS
Receiver
LVDS
Driver
Receiver
100ȍ
100ȍ
OUT+
OUT-
Figure 10. LVDS to LVDS Connection, Internal 100ohm
Some LVDS structures have an internal 100 ohm resistor
on the input and do not need additional components.
Figure 11. LVDS to LVDS Connection
External 100ohm and AC blocking caps
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.
Figure 9. Standard LVDS
Output Configuration
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.
Environmental and IR Compliance
Table 4. Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Temperature Cycle
Solderability
Condition
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
MSL1
Fine and Gross Leak
Resistance to Solvents
Moisture Sensitivity Level
Contact Pads
Gold over Nickel
IR Compliance
Suggested IR Profile
tL
tP
Devices are built using lead free epoxy and can be subjected to
standard lead free IR reflow conditions shown in Table 5. Contact
pads are gold over nickel and lower maximum temperatures can also
be used, such as 220C.
260
RUP
217
200
RDN
Table 5. Reflow Profile
Parameter
PreHeat Time
Symbol
ts
Value
150
25
200 sec Max
3°C/sec Max
150 sec Max
480 sec Max
30 sec Max
60 sec Max
6°C/sec Max
tS
Ramp Up
RUP
Time above 217°C
Time to Peak Temperature
Time at 260°C
tL
Reliability
tAMB-P
tAMB-P
tP
Time at 240°C
tP2
Ramp down
RDN
Time (sec)
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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