IT6605
products/product-detail.jsp?navId=H0,C2,C222,P3028).
Figure 19. Layout example for high-speed TMDS differential signals
6. By default Pin 55 (REXT) should be connected to ground via a 500Ω/1% precision SMD resistor to
provide for receiver termination calibration. If this pin is to be left open, be sure to set the bit 6 of
register 0x6A to '1' in order to disable the termination calibration. Disabling the termination calibration
would leave the value of termination impedance subject to process, supply voltage and temperature
variation, sometimes rendering it out of specification and degrading the performance. Therefore it is
highly recommended that this calibration function is left turned-on and a 500Ω/1% resistor is
connected between Pin 55 and ground. The resistor should be placed as close to the IT6605 as
possible.
Feb-2012 Rev:0.92 36/38
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