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DS42MB200 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # DS42MB200
Description  Dual 4.25 Gb/s 1:2 Mux/Buffer with Input Equalization and Output Pre-Emphasis
PDF  14 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DS42MB200 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Functional Description (Continued)
TABLE 3. LINE-SIDE PRE-EMPHASIS CONTROLS
PreL_[1:0]
Pre-Emphasis Level in
mV
PP
(VODB)
De-Emphasis Level
in mV
PP
(VODPE)
Pre-Emphasis in dB
(VODPE/VODB)
Typical FR4 board
trace
0 0
1200
1200
0
10 inches
0 1
1200
850
−3
20 inches
1 0
1200
600
−6
30 inches
1 1 (default)
1200
426
−9
40 inches
TABLE 4. SWITCH-SIDE PRE-EMPHASIS CONTROLS
PreS_[1:0]
Pre-Emphasis Level in
mV
PP
(VODB)
De-Emphasis Level
in mV
PP
(VODPE)
Pre-Emphasis in dB
(VODPE/VODB)
Typical FR4 board
trace
0 0
1200
1200
0
10 inches
0 1
1200
850
−3
20 inches
1 0
1200
600
−6
30 inches
1 1 (default)
1200
426
−9
40 inches
20178637
FIGURE 1. Driver Pre-Emphasis Differential Waveform (showing all 4 pre-emphasis steps)
www.national.com
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