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LMH0395 Datasheet(PDF) 13 Page - Texas Instruments

Part # LMH0395
Description  3G HD/SD SDI Dual Output Low Power Extended Reach Adaptive Cable Equalizer
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMH0395 Datasheet(HTML) 13 Page - Texas Instruments

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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-
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-
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
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