DS16EV5110_08 NSC [National Semiconductor], DS16EV5110_08 Datasheet - Page 14

• Manufacturer Part Number: DS16EV5110_08
• Description: Video Equalizer (3D+C) for DVI, HDMI Sink-Side Applications
• Manufacturer: NSC [National Semiconductor]

www.national.com
CABLE SELECTION
At higher frequencies, longer cable lengths produce greater
losses due to the skin effect. The quality of the cable with
respect to conductor wire gauge and shielding heavily influ-
ences performance. Thicker conductors have lower signal
degradation per unit length. In nearly all applications, the
DS16EV5110 equalization can be set to 0x04, and equalize
up to 22 dB skin effect loss for all input cable configurations
at all data rates, without degrading signal integrity.
28 AWG STP DVI / HDMI CABLES RECOMMENDED
BOOST SETTINGS
The following table presents the recommended boost control
settings for various data rates and cable lengths for 28 AWG
DVI/HDMI compliant configurations. Boost setting maybe
done via the three BST[2:0] pins or via the respective register
values.
Figure 8 shows the cable extension and jitter reduction ob-
tained with the use of the equalizer. Table 6 lists the various
gain settings used versus cable length recommendations.
FIGURE 8. Equalized vs. Unequalized Jitter Performance
Setting
0x04
0x04
0x06
0x06
0x03
0x06
TABLE 6. Boost Control Setting for STP Cables
Data Rate
1.65 Gbps
1.65 Gbps
2.25 Gbps
2.25 Gbps
750 Mbps
750 Mbps
Over 28 AWG DVI/HDMI Cable
25m to greater than 30m
20m to greater than 25m
15m to greater than 20m
28 AWG DVI / HDMI
0–25m
0–20m
0–15m
20216242
14
UTP (UNSHIELDED TWIST PAIRS) CABLES
The DS16EV5110 can be used to extend the length of UTP
cables, such as Cat5, Cat5e and Cat6 to distances greater
than 20 meters at 1.65 Gbps with < 0.13 UI of jitter. Please
note that for non-standard DVI/HDMI cables, the user must
ensure the clock-to-data channel skew requirements are met.
Table 7 presents the recommended boost control settings for
various data rates and cable lengths for UTP configurations:
Figure 9 shows the cable extension and jitter reduction ob-
tained with the use of the equalizer. Table 7 lists the various
gain settings used versus cable length recommendations.
FIGURE 9. Equalized vs. Unequalized Jitter Performance
Setting
0x03
0x06
0x03
TABLE 7. Boost Control Setting for UTP Cables
1.65 Gbps
Data Rate
750 Mbps
750 Mbps
Over Cat5 Cable
Greater than 20m
Cat5 Cable
25–45m
0–25m
20216243