Datasheet

505
VDD
505
Zo
DS34RT5110
Driver
DS34RT5110
Receiver
12 k5
VOD_CRL
VDD
505
505
6225
6225
24 k5
VOD_CRL
DS34RT5110
www.ti.com SNLS310G –MARCH 2009–REVISED APRIL 2013
Figure 13. AC Coupled Application
CABLE SELECTION AND INTER-PAIR SKEW
DVI v1.0 and HDMI v1.3a specify Inter-Pair Skew requirements for the system. The DS34RT5110 intends to
extend the longer cable reach with STP (DVI / HDMI) cable, or UTP (Cat5 / Cat5e / Cat6) cable, and it does not
have a de-skew function to compensate any cable Inter-Pair Skews. Long cable with Inter-Pair Skew exceeding
the DVI / HDMI standard limit tolerance could cause system distortion. Therefore, TI suggests the consideration
of Inter-Pair Skew budget during the system design, and recommends Low-Skew Video grade cables for cable
extending applications.
28 AWG STP (SHIELDED TWIST PAIRS) DVI / HDMI CABLES RECOMMENDED EQ SETTINGS
Table 4 provides the recommended EQ control settings for various data rates and cable lengths for 28 AWG
DVI/HDMI compliant configurations. The EQ setting is made via three EQ [2:0] pins.
Table 4. EQ Control Setting for STP Cable
Format (Data Rate) 0 ~ 10m > 10m
1080P 48-bit (3.4 Gbps) Setting 0x01 Setting 0x06
1080P 36-bit (2.25 Gbps) Setting 0x01 Setting 0x06
1080P (1.65 Gbps) Setting 0x01 Setting 0x06
1080I (750 Mbps) Setting 0x06 Setting 0x06
24 AWG UTP (LOW SKEW UNSHIELDED TWIST PAIRS) CABLES
The DS34RT5110 can be used to extend the length of low skew grade UTP cables, such as Cat5e and Cat6 to
distances greater than 30 meters at 1.65 Gbps with < 0.20 UI of jitter. Note that for non-standard DVI/HDMI
cables, the user must ensure the inter pair skew requirements are met. Table 5 shows the recommended EQ
control settings for various data rates and cable lengths for UTP configurations.
Table 5. EQ Control Setting for UTP Cable
Format (Data Rate) 0 ~ 10m > 10m
1080P 48-bit (3.4 Gbps) Setting 0x01 Setting 0x05
1080P 36-bit (2.25 Gbps) Setting 0x01 Setting 0x05
1080P (1.65 Gbps) Setting 0x01 Setting 0x05
1080I (750 Mbps) Setting 0x05 Setting 0x05
General Recommendations
The DS34RT5110 is a high performance circuit capable of delivering excellent performance. To achieve optimal
performance, careful attention must be paid to the details associated with high-speed design as well as providing
a clean power supply. Refer to the LVDS Owner’s Manual for more detailed information on high-speed design
tips as well as many other available resources addressing signal integrity design issues.
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