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XIO2000AI 数据表(PDF) 145 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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XIO2000AI 数据表(HTML) 145 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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145 / 159 page  Electrical Characteristics 135 April 2007 Revised October 2008 SCPS155C 7.4 PCI Express Differential Transmitter Output Ranges PARAMETER TERMINALS MIN NOM MAX UNITS COMMENTS UI Unit interval TXP, TXN 399.88 400 400.12 ps Each UI is 400 ps ±300 ppm. UI does not account for SSC dictated variations. See Note 6. VTX-DIFFp-p Differential peak-to-peak output voltage TXP, TXN 0.8 1.2 V VTX-DIFFp-p = 2*|VTXP − VTXN| See Note 7. VTX-DE-RATIO De-emphasized differential output voltage (ratio) TXP, TXN −3.0 −3.5 −4.0 dB This is the ratio of the VTX-DIFFp-p of the second and following bits after a transition divided by the VTX-DIFFp-p of the first bit after a transition. See Note 7. TTX-EYE Minimum TX eye width TXP, TXN 0.75 UI The maximum transmitter jitter can be derived as TTXMAX- JITTER = 1 − TTX-EYE = 0.3 UI See Notes 7 and 8. TTX-EYE-MEDIAN-to-MAX -JITTER Maximum time between the jitter median and maximum deviation from the median TXP, TXN 0.15 UI Jitter is defined as the measurement variation of the crossing points (VTX-DIFFp-p = 0 V) in relation to recovered TX UI. A recovered TX UI is calculated over 3500 consecutive UIs of sample data. Jitter is measured using all edges of the 250 consecutive UIs in the center of the 3500 UIs used for calculating the TX UI. See Notes 7 and 8. TTX-RISE, TTX-FALL P/N TX output rise/fall time TXP, TXN 0.125 UI See Notes 7 and 10. VTX-CM-ACp RMS ac peak common mode output voltage TXP, TXN 20 mV VTX-CM-ACp = RMS(|VTXP + VTXN|/2 – VTX-CM-DC) VTX-CM-DC = DC(avg) of |VTXP + VTXN|/2 See Note 7. VTX-CM-DC-ACTIVE-IDLE- DELTA Absolute delta of dc common mode voltage during L0 and electrical idle TXP, TXN 0 100 mV |VTX-CM-DC – VTX-CM-Idle-DC| 100 mV VTX-CM-DC = DC(avg) of |VTXP + VTXN|/2 [during L0] VTX-CM-Idle-DC = DC(avg) of |VTXP + VTXN|/2 [during electrical idle] See Note 7. VTX-CM-DC-LINE-DELTA Absolute delta of dc common mode voltage between P and N TXP, TXN 0 25 mV |VTXP-CM-DC – VTXN-CM-DC| 25 mV when VTXP-CM-DC = DC(avg) of |VTXP| VTXN-CM-DC = DC(avg) of |VTXN| See Note 7. VTX-IDLE-DIFFp Electrical idle differential peak output voltage TXP, TXN 0 20 mV VTX-IDLE-DIFFp = |VTXP-Idle − VTXN-Idle| 20 mV See Note 7. VTX-RCV-DETECT The amount of voltage change allowed during receiver detection TXP, TXN 600 mV The total amount of voltage change that a transmitter can apply to sense whether a low impedance receiver is present. VTX-DC-CM The TX dc common mode voltage TXP, TXN 0 3.6 V The allowed dc common mode voltage under any condition |
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