AD8155ACPZ-R7 datasheet(29/36 Pages) AD

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AD8155

Rev. 0 | Page 29 of 36

Table 20. Symbol Definitions

Symbol

Formula

Definition

IDC

Programmable

Output current that sets output level

IPE

Programmable

Output current for PE delayed tap

ITTO

IDC + IPE

Total transmitter output current

VDPP-DC

25 Ω × IDC × 2

Peak-to-peak differential voltage swing of

nonpreemphasized waveform

VDPP-PE

25 Ω × ITTO × 2

Peak-to-peak differential voltage swing of preemphasized

waveform

VSW-DC

VDPP-DC/2 = VH-DC – VL-DC

DC single-ended voltage swing

VSW-PE

VDPP-PE/2 = VH-PE – VL-PE

Preemphasized single-ended voltage swing

∆VOCM_DC-COUPLED

25 Ω × ITTO/2

Output common-mode shift, dc-coupled outputs

∆VOCM_AC-COUPLED

50 Ω × ITTO/2

Output common-mode shift, ac-coupled outputs

VOCM

VTTO − ∆VOCM = ( VH-DC + VL-DC )/2

Output common-mode voltage

VH-DC

VTTO − ∆VOCM + VDPP-DC/2

DC single-ended output high voltage

VL-DC

VTTO − ∆VOCM − VDPP-DC/2

DC single-ended output low voltage

VH-PE

VTTO − ∆VOCM + VDPP-PE/2

Maximum single-ended output voltage

VL-PE

VTTO − ∆VOCM − VDPP-PE/2

Minimum single-ended output voltage

VH-DC

VH-PE

VSW-PE

VL-PE

VL-DC

tPE

TTO

VOCM

VSW-DC

Figure 46. VH, VL, and VOCM

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