SNOSDC1A June 2024 – October 2024 LMH1229 , LMH1239
PRODUCTION DATA
OUT0 and OUT1 are host-side 100Ω driver outputs from the SDI input cable equalizer. Both OUT0 and OUT1 also support polarity inversion.
The driver offers the capability to select higher output amplitude and de-emphasis levels for longer board trace that connects the drivers to their downstream receivers. Driver de-emphasis provides transmitter equalization to reduce the ISI caused by the board trace.
The VOD_DE pin determines the output amplitude (VOD) and de-emphasis levels applied to the OUT0 and OUT1 PCB driver. These settings can be changed through register control if finer resolution in settings is desired.
Table 6-8 details the OUT0 and OUT1 VOD and de-emphasis settings that can be applied. The VOD_DE pin settings can be overridden by register control. When these parameters are controlled by registers, the VOD and de-emphasis levels can be programmed independently. For more information, refer to the LMH12x9 Programming Guide.
VOD_DE(1) | OUT0± and OUT1± VOD (mVpp) | OUT0± and OUT1± DEM (dB) | RECOMMENDED BOARD TRACE AT OUT0± and OUT1±(2) |
---|---|---|---|
H | 410 | 0 | < 1 inch |
F | 560 | –1.0 | 1-2 inches |
R | 635 | –2.4 | 4-5 inches |
L | 810 | –6.1 | 8-10 inches |