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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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DS250DF230ZLSR bảng dữ liệu(PDF) 21 Page - Texas Instruments |
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DS250DF230ZLSR bảng dữ liệu(HTML) 21 Page - Texas Instruments |
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21 / 105 page  21 DS250DF230 www.ti.com SNLS590B – AUGUST 2018 – REVISED OCTOBER 2019 Product Folder Links: DS250DF230 Submit Documentation Feedback Copyright © 2018–2019, Texas Instruments Incorporated 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 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 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 0 +23 0 1.056 NA NA 0 +24 0 1.076 NA NA 0 +25 0 1.096 NA NA 0 +26 0 1.120 NA NA 0 +27 0 1.140 NA NA 0 +28 0 1.155 NA NA 0 +29 0 1.175 NA NA 0 +30 0 1.185 NA NA 0 +31 0 1.195 NA NA 0 +16 –1 0.880 NA 2.0 0 +15 –2 0.880 NA 2.7 0 +14 –3 0.880 NA 3.4 0 +13 –4 0.880 NA 4.3 0 +12 –5 0.880 NA 5.4 0 +11 –6 0.880 NA 6.7 0 +10 –7 0.880 NA 8.4 0 +9 –8 0.880 NA 11 |
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