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Profiles of Today's Data Transmission Standards
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Profiles of Today's Data Transmission Standards
Low voltage differential signaling (LVDS) technology offers one of the best data transmission profiles available today for physical layer interfaces. A comparison of LVDS technology to other standards on key performance measures is detailed in the following table.
| Data Transmission Standards |
| Performance Measure |
LVDS |
PECL |
RS-422/RS-485 |
TTL |
| Speed |
> 400 Mbps |
> 400 Mbps |
< 50 Mbps |
< 100 Mbps |
| Power Consumption |
low |
medium |
high |
high |
| Noise immunity |
low |
medium |
medium |
high |
| EMI Emissions |
low |
medium |
medium |
high |
| Voltage swing |
~350 mV |
~800 mV |
~ 3.5 V |
~3.7 V |
| Termination Technique |
One 100-ohm resistor |
One 100-ohm resistor and two 220-ohm resistors |
422: one 100-ohm resistor 485: two 50-ohm resistors |
Varies |
| Transmission Distance |
£ 15 m |
£ 1 m |
£ 1200 m |
£ 1 m |
| Relative cost of implementation |
medium |
high |
medium |
low |
# # #
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