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DS90LV047A Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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DS90LV047A Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 13 page  Typical Performance Curves (Continued) Data Rate vs Cable Length 10088730 DATA RATE VS CABLE LENGTH GRAPH TEST PROCEDURE A pseudo-random bit sequence (PRBS) of 2 9−1 bits was programmed into a function generator (Tektronix HFS9009) and connected to the driver inputs via 50 Ω cables and SMB connectors. An oscilloscope (Tektronix 11801B) was used to probe the resulting eye pattern, measured differentially at the input to the receiver. A 100 Ω resistor was used to terminate the pair at the far end of the cable. The measurements were taken at the far end of the cable, at the receiver"s input, and used for the jitter analysis for this graph. The frequency of the input signal was increased until the measured jitter (t tcs) equaled 20% with respect to the unit interval (t tui) for the particular cable length under test. Twenty percent jitter is a reasonable place to start with many system designs. The data used was NRZ. Jitter was measured at the 0V differen- tial voltage of the differential eye pattern. The cables used were LG UTP 4 pair 24 gauge CAT 5 cables. The DS90LV047A and DS90LV048A were tested using the new LVDS Flow-Evaluation Board LVDS47/48PCB which is avail- able in the LVDS47/48EVK evaluation kit. The curve shows very good typical performance that can be used as a design guideline for data rate vs cable length. Increasing the jitter percentage increases the curve respec- tively, allowing the device to transmit faster over longer cable lengths. This relaxes the jitter tolerance of the system allow- ing more jitter into the system, which could reduce the reli- ability and efficiency of the system. Alternatively, decreasing the jitter percentage will have the opposite effect on the system. The area under the curve is considered the safe operating area based on the above signal quality criteria. For more information on eye pattern testing, please see National Application Note AN-808. www.national.com 11 |
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