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AM3874 Datasheet(PDF) 259 Page - Texas Instruments |
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AM3874 Datasheet(HTML) 259 Page - Texas Instruments |
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259 / 361 page  TD0+ TD0- TD1+ TD1- TD2+ TD2- TD0 Shld TD1 Shld TD2 Shld TCLK Shld CEC SDA SCL DDC Gnd Rpullup (A) 3.3 V HDMI_DP0 HDMI_DN0 HDMI_DP1 HDMI_DN1 HDMI_DN2 HDMI_DP2 HDMI_CLKP HDMI_CLKN HDMI_CEC HDMI_SDA HDMI_SCL HDMI Connector Device TCLK+ TCLK TPD12S521 or other ESD Protection w/I2C-Level Translation HPDET HDMI_HPDET AM3874, AM3871 www.ti.com SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013 A. 5K-10K Ω pullup resistors are required if not integrated in the ESD protection chip. Figure 8-37. HDMI Interface High-Level Schematic 8.9.1.2 TMDS Routing The TMDS signals are high-speed differential pairs. Care must be taken in the PCB layout of these signals to ensure good signal integrity. The TMDS differential signal traces must be routed to achieve 100 Ω (±10%) differential impedance and 60 Ω (±10%) single-ended impedance. Single-ended impedance control is required because differential signals are extremely difficult to closely couple on PCBs and, therefore, single-ended impedance becomes important. These impedances are impacted by trace width, trace spacing, distance to reference planes, and dielectric material. Verify with a PCB design tool that the trace geometry for both data signal pairs results in as close to 60 Ω impedance traces as possible. For best accuracy, work with your PCB fabricator to ensure this impedance is met. In general, closely coupled differential signal traces are not an advantage on PCBs. When differential signals are closely coupled, tight spacing and width control is necessary. Very small width and spacing variations affect impedance dramatically, so tight impedance control can be more problematic to maintain in production. Loosely coupled PCB differential signals make impedance control much easier. Wider traces and spacing make obstacle avoidance easier, and trace width variations do not affect impedance as much; therefore, it is easier to maintain an accurate impedance over the length of the signal. The wider traces also show reduced skin effect and, therefore, often result in better signal integrity. Table 8-40 shows the routing specifications for the TMDS signals. Table 8-40. TMDS Routing Specifications PARAMETER MIN TYP MAX UNIT MPU-to-HDMI header trace length 7000 Mils Number of stubs allowed on TMDS traces 0 Stubs TX/RX pair differential impedance 90 100 110 Ω TX/RX single ended impedance 54 60 66 Ω Number of vias on each TMDS trace 2 Vias(1) (1) Vias must be used in pairs with their distance minimized. Copyright © 2011–2013, Texas Instruments Incorporated Peripheral Information and Timings 259 Submit Documentation Feedback Product Folder Links: AM3874 AM3871 |
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