DS92LV2411_15 Datasheet, PDF (24/54 Pages) Texas Instruments – 5 to 50 MHz 24-Bit Channel Link II Serializer And Deserializer

DS92LV2411, DS92LV2412
SNLS302E – MAY 2010 – REVISED FEBRUARY 2015
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Feature Description (continued)
8.3.1.2 Integrated Signal Conditioning Features — Ser
8.3.1.2.1 Ser — VOD Select (VODSEL)
The Ser differential output voltage may be increased by setting the VODSEL Pin High. When VODSEL is Low,
the VOD is at the standard (default) level. When VODSEL is High, the VOD is increased in level. The increased
VOD is useful in extremely high noise environments and also on extra long cable length applications. When
using de-emphasis it is recommended to set VODSEL = H to avoid excessive signal attenuation especially with
the larger de-emphasis settings. This feature may be controlled by the external Pin or by register.
INPUT
VODSEL
H
L
Table 1. Differential Output Voltage
VOD
mV
±420
±280
EFFECT
VOD
mVp-p
840
560
8.3.1.2.2 Ser — De-Emphasis (De-Emph)
The De-Emph Pin controls the amount of de-emphasis beginning one full bit time after a logic transition that the
Ser drives. This is useful to counteract loading effects of long or lossy cables. This Pin should be left open for
standard switching currents (no de-emphasis) or if controlled by register. De-emphasis is selected by connecting
a resistor on this Pin to ground, with R value between 0.5 kΩ to 1 MΩ, or by register setting. When using De-
Emphasis it is recommended to set VODSEL = H.
Open
0.6
1.0
2.0
5.0
Table 2. De-Emphasis Resistor Value
RESISTOR VALUE (kΩ)
Disabled
- 12 dB
- 9 dB
- 6 dB
- 3 dB
DE-EMPHASIS SETTING
0.00
-2.00
VDD = 1.8V,
T_A = 25^oC
-4.00
-6.00
-8.00
-10.00
-12.00
-14.00
1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06
R VALUE - LOG SCALE (:)
Figure 21. De-Emph vs. R Value
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