DS280DF810ABVT datasheet(22/51 Pages) TI1

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Differential

Voltage

Time [UI]

0 V

Transmitted

Bits: 0

Differential

Voltage

Time [UI]

0 V

Transmitted

Bits: 0

DS280DF810

SNLS538A – SEPTEMBER 2016 – REVISED OCTOBER 2019

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Figure 9. Conceptual FIR Waveform With Pre-Cursor Only

Figure 10. Conceptual FIR Waveform With Both Pre-Cursor and Post-Cursor

8.3.1.9.1

Setting the Output VOD, Pre-Cursor, and Post-Cursor Equalization

The output differential voltage (VOD) 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 should adjust the main

cursor tap value relative to the pre tap or post tap changes so as to maintain a constant absolute sum of the FIR

tap values. The table below shows various settings for VOD settings ranging from 205 mVpp to 1225 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 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]

0.205

0.260

0.305

0.355

DS280DF810ABVT Datasheet(PDF) 22 Page - Texas Instruments

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