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DS250DF230ZLS Datasheet(PDF) 21 Page - Texas Instruments

Part # DS250DF230ZLS
Description  DS250DF230 25-Gbps Multi-Rate 2-Channel Retimer
PDF  119 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

DS250DF230ZLS Datasheet(HTML) 21 Page - Texas Instruments

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Differential
Voltage
Time [UI]
v1
v2
v3
v4
v5
v6
v7
v8
0V
Transmitted
Bits: 0
0
1
1
1
1
0
0
0
0
1
0
1
Figure 8-4. Conceptual FIR Waveform With Both Pre- and Post-Cursor
8.3.9.1 Setting the Output VOD, Pre-Cursor, and Post-Cursor Equalization
The output differential voltage (VOD), pre-cursor, and post-cursor equalization of the driver is controlled by
manipulating the FIR tap settings. The main cursor tap is the primary knob for amplitude adjustment. The
pre- and post-cursor FIR tap settings can then be adjusted to provide equalization. To maintain a constant
peak-to-peak VOD, the user must adjust the main cursor tap value relative to the pre- and post-cursor tap
changes so as to maintain a constant absolute sum of the FIR tap values. Table 8-2 shows various settings for
VOD settings ranging from 350 mVpp to 1195 mVpp (typical). Note that the output peak-to-peak amplitude is a
function of the sum of the absolute values of the taps, whereas the low-frequency amplitude is purely a function
of the main-cursor value.
Table 8-2. Typical VOD and FIR Values
FIR SETTINGS
Peak-to Peak
VOD(V)
RPRE(dB)
RPST(dB)
PRE-CURSOR:
REG_0x3E[6:0]
MAIN-CURSOR:
REG_0x3D[6:0]
POST-CURSOR:
REG_0x3F[6:0]
0
+3
0
0.350
NA
NA
0
+4
0
0.392
NA
NA
0
+5
0
0.436
NA
NA
0
+6
0
0.482
NA
NA
0
+7
0
0.524
NA
NA
0
+8
0
0.562
NA
NA
0
+9
0
0.602
NA
NA
0
+10
0
0.638
NA
NA
0
+11
0
0.678
NA
NA
0
+12
0
0.710
NA
NA
0
+13
0
0.748
NA
NA
0
+14
0
0.782
NA
NA
0
+15
0
0.816
NA
NA
0
+16
0
0.846
NA
NA
0
+17
0
0.880
NA
NA
0
+18
0
0.910
NA
NA
0
+19
0
0.944
NA
NA
0
+20
0
0.968
NA
NA
0
+21
0
0.998
NA
NA
0
+22
0
1.028
NA
NA
www.ti.com
DS250DF230
SNLS590C – AUGUST 2018 – REVISED JUNE 2021
Copyright © 2021 Texas Instruments Incorporated
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