DS90LV031ATMTCX/NOPB National Semiconductor, DS90LV031ATMTCX/NOPB Datasheet - Page 7

• Manufacturer Part Number: DS90LV031ATMTCX/NOPB
• Description: IC LINE DRIVER QUAD CMOS 16TSSOP
• Manufacturer: National Semiconductor
• Type: Driverr

Specifications of DS90LV031ATMTCX/NOPB

• Number Of Drivers/receivers: 4/0
• Protocol: RS644
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DS90LV031ATMTCX

Probing LVDS Transmission Lines:
Always use high impedance (> 100kΩ), low capacitance
(< 2pF) scope probes with a wide bandwidth (1GHz) scope.
Improper probing will give deceiving results.
Cables and Connectors, General Comments:
When choosing cable and connectors for LVDS it is important
to remember:
Use controlled impedance media. The cables and connectors
you use should have a matched differential impedance of
about 100Ω. They should not introduce major impedance dis-
continuities.
Balanced cables (e.g. twisted pair) are usually better than
unbalanced cables (ribbon cable, simple coax.) for noise re-
duction and signal quality. Balanced cables tend to generate
less EMI due to field canceling effects and also tend to pick
up electromagnetic radiation as common-mode (not differen-
Typical Application
FIGURE 7. Point-to-Point Application
FIGURE 6. Driver Output Levels
7
tial mode) noise which is rejected by the receiver. For cable
distances < 0.5M, most cables can be made to work effec-
tively. For distances 0.5M
twisted pair cable works well, is readily available and relatively
inexpensive.
Fail-safe of an LVDS Interface
If the LVDS link as shown in
case where the Line Driver is disabled, powered off, or re-
moved (un-plugged) and the Receiver device is powered on
and enabled, the state of the LVDS bus is unknown and
therefore the output state of the Receiver is also unknown. If
this is of concern, please consult the respective LVDS Re-
ceiver data sheet for guidance on Failafe Biasing options for
the LVDS interface to set a known state on the inputs for these
conditions.
≤
d
Figure 7
≤
10M, CAT 3 (category 3)
10009508
needs to support the
10009509
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