Datasheet

AD8158
Rev. B | Page 30 of 36
Table 20. Symbol Definitions
Symbol Formula Definition
I
DC
Programmable Output current that sets output level
I
PE
Programmable Output current for PE delayed tap
I
TTO
I
DC
+ I
PE
Total transmitter output current
V
DPP-DC
25 Ω × I
DC
× 2
Peak-to-peak differential voltage swing of
nonpreemphasized waveform
V
DPP-PE
25 Ω × I
TTO
× 2
Peak-to-peak differential voltage swing of preemphasized
waveform
V
SW-DC
V
DPP-DC
/2 = V
H-DC
– V
L-DC
DC single-ended voltage swing
V
SW-PE
V
DPP-PE
/2 = V
H-PE
– V
L-PE
Preemphasized single-ended voltage swing
∆V
OCM_DC-COUPLED
25 Ω × I
TTO
/2 Output common-mode shift, dc-coupled outputs
∆V
OCM_AC-COUPLED
50 Ω × I
TTO
/2 Output common-mode shift, ac-coupled outputs
V
OCM
V
TTO
− ∆V
OCM
= ( V
H-DC
+ V
L-DC
)/2 Output common-mode voltage
V
H-DC
V
TTO
− ∆V
OCM
+ V
DPP-DC
/2 DC single-ended output high voltage
V
L-DC
V
TTO
− ∆V
OCM
− V
DPP-DC
/2 DC single-ended output low voltage
V
H-PE
V
TTO
− ∆V
OCM
+ V
DPP-PE
/2 Maximum single-ended output voltage
V
L-PE
V
TTO
− ∆V
OCM
− V
DPP-PE
/2 Minimum single-ended output voltage
V
H-DC
V
H-PE
V
SW-PE
V
L-PE
V
L-DC
t
PE
V
TTO
V
OCM
V
SW-DC
0
6646-140
Figure 46. V
H
, V
L
, and V
OCM