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AD8153 Datasheet(PDF) 21 Page - Analog Devices |
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AD8153 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 24 page 
AD8153 Rev. 0 | Page 21 of 24 OUTPUT COMPLIANCE Figure 40 is a graphical depiction of the single-ended waveform at the output of the AD8153. The common-mode level (VOCM) and the amplitude (VOSE) of this waveform are a function of the output tail current (IT), the output termination supply voltage (VTTO), the topology of the far-end receiver, and whether ac- or dc-coupling is used. Keep in mind that the output tail current varies with the pre-emphasis level. The user must ensure that the high (VH) and low (VL) voltage excursions at the output are within the single-ended absolute voltage range limits as specified in Table 1. Failure to understand the implications of output signal levels and the choice of ac- or dc-coupling may lead to transistor saturation and poor transmitter performance. Table 9 shows an example calculation of the output levels for the typical case, where VCC = VTTO = 3.3 V, with 50 Ω far-end terminations to a 3.3 V supply. VOCM VH VL VOSE-DC VOSE-BOOST VTTO ~320ps Figure 40. Single-Ended Output Waveform Table 9. Output Voltage Levels DC-Coupled AC-Coupled PE Setting IT (mA) VOSE-DC (mV p-p) VOSE-BOOST (mV p-p) VOCM (V) VH (V) VL (V) VOCM (V) VH (V) VL (V) 0 16 400 400 3.1 3.3 2.9 2.9 3.1 2.7 1 20 400 500 3.05 3.3 2.8 2.8 3.05 2.55 2 24 400 600 3 3.3 2.7 2.7 3 2.4 3 28 400 700 2.95 3.3 2.6 2.6 2.95 2.25 Table 10. Symbol Definitions Symbol Formula Definition VOSE-DC Ω × = 25 0 PE T I Single-ended output voltage swing after settling VOSE-BOOST Ω ×25 T I Boosted single-ended output voltage swing VOCM (dc-coupled) Ω × − 25 2 T TTO I V Common-mode voltage when the output is dc-coupled VOCM (ac-coupled) Ω × − 50 2 T TTO I V Common-mode voltage when the output is ac-coupled VH VOCM + VOSE-BOOST/2 High single-ended output voltage excursion VL VOCM - VOSE-BOOST/2 Low single-ended output voltage excursion |
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