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LMH0395 Datasheet(PDF) 13 Page - Texas Instruments |
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LMH0395 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 33 page ![]() SDO0 SDO0 SDI SDI LMH0395 Coaxial Cable 75: 49.9: 75: 5.6 nH 1.0 PF 1.0 PF SDI SDI LMH0346 3G/HD/SD SDI Reclocker 100: Differential T-Line 100: SDO1 SDO1 SDI SDI LMH0346 3G/HD/SD SDI Reclocker 100: Differential T-Line 100: LMH0395 www.ti.com SNLS323M – AUGUST 2010 – REVISED JULY 2015 Feature Description (continued) 7.3.4 Output Interfacing The LMH0395 dual output differential pairs, SDO0, SDO0, SDO1, and SDO1 are internally terminated 100- Ω LVDS outputs. These outputs can be DC coupled to most common differential receivers. The default output common-mode voltage (VOS) is 1.2 V. The output common-mode voltage may be adjusted through the SPI in 200 mV increments, from 0.8 V to 1.2 V (see Output Driver Adjustments and De-Emphasis Setting in the SPI Register Access section). When the output common mode is supply referenced, the common- mode voltage is about 1.35 V (for 700 mVP-P differential swing). This adjustable output common-mode voltage offers flexibility for interfacing to many types of receivers. The default differential output swing (VSSP-P) is 700 mVP-P. The differential output swing may be adjusted through the SPI. Valid options are 400, 600, 700, or 800 mVP-P (see Output Driver Adjustments and De-Emphasis Setting in the SPI Register Access section). The LMH0395 output should be DC coupled to the input of the receiving device where possible. 100- Ω differential transmission lines should be used to connect between the LMH0395 outputs and the input of the receiving device. The LMH0395 output should not be DC coupled to CML inputs. If there are strong pull-up resistors (that is, 50 Ω) at the receiving device, AC coupling should be used. The value of these AC-coupling capacitors should be large enough (typically 4.7 µF) to accommodate for the SD pathological video pattern. Figure 7 shows an example of a DC-coupled interface between the LMH0395 and LMH0346 SDI reclocker. The differential transmission line should be terminated with a 100- Ω resistor at the receiving device as shown. The resistor should be placed as close as possible to the LMH0346 input. If desired, this network may be terminated with two 50- Ω resistors and a center-tap capacitor to ground in place of the single 100-Ω resistor. Figure 8 shows an example of a DC-coupled interface between the LMH0395 and LMH0356 SDI reclocker. The LMH0356 inputs have internal 50- Ω terminations (100 Ω differential) to terminate the transmission line, so no additional components are required. The LMH0395 output drivers are equipped with programmable output de-emphasis to minimize inter-symbol interference caused by the loss dispersion from driving signals across PCB traces (see Output Driver Adjustments and De-Emphasis Setting in the SPI Register Access section). De-emphasis works with all combinations of output common-mode voltage and output voltage swing settings to support DC coupling to the receiving device. Figure 7. DC Output Interface To LMH0346 Reclocker Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: LMH0395 |
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