Datasheet

MAX4950A
Dual PCI Express Equalizer/Redriver
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
f = 0.05GHz to 1.25GHz 10
Differential Output Return Loss
(Note 5)
RL
TX-DIFF
f = 1.25GHz to 2.5GHz 8
dB
Common-Mode Output Return
Loss (Note 5)
RL
TX-CM
f = 0.05GHz to 2.5GHz 6 dB
Redriver-Operation Differential
Input Signal Range
V
RX-DIFF-PP
f = 0.05GHz to 2.5GHz 120 1200 mV
P-P
Full-Swing No-Deemphasis
Differential Output Voltage
V
TX-DIFF-PP
ABS|V
OUT_P
- V
OUT_M
|; O_AMP_ = GND 800 1000 1200 mV
P-P
Low-Swing No-Deemphasis
Differential Output Voltage
V
TX-DIFF-
PP-LOW
ABS|V
OUT_P
- V
OUT_M
|; O_AMP_ = V
CC
600 750 900 mV
P-P
Output Deemphasis Ratio, 0dB
V
TX-DE-
RATIO-0dB
f = 2.5GHz, ODE_1 = GND, ODE_0 = GND,
Figure 1 (see Table 3)
0 dB
Output Deemphasis Ratio,
3.5dB
V
TX-DE-
RATIO-3.5dB
f = 2.5GHz, ODE_1 = GND, ODE_0 = V
CC
,
Figure 1 (see Table 3)
3.5 dB
Output Deemphasis Ratio, 6dB
V
TX-DE-
RATIO-6dB
f = 2.5GHz, ODE_1 = V
CC
, ODE_0 = V
CC
or
GND, Figure 1 (see Table 3)
6 dB
Input Equalization, 0dB (Note 6)
V
RX-EQ-
0dB
f = 2.5GHz, INEQ_1 = GND,
INEQ_0 = GND (see Table 2)
0 dB
Input Equalization, 3.5dB
(Note 6)
V
RX-EQ-
3.5dB
f = 2.5GHz, INEQ_1 = GND, INEQ_0 = V
CC
(see Table 2)
3.5 dB
Input Equalization, 6dB (Note 6)
V
RX-EQ-
6dB
f = 2.5GHz, INEQ_1 = V
CC
, INEQ_0 = V
CC
or GND (see Table 2)
6 dB
Output Common-Mode Voltage
V
TX-CM-AC-
PP
MAX(V
OUT_P
+ V
OUT_M
)/2 - MIN(V
OUT_P
+
V
OUT_M
)/2
100 mV
P-P
Propagation Delay (Note 5) T
PD
f = 2.5GHz 160 280 400 ps
Rise/Fall Time
T
TX-RISE-
FALL
(Note 7) 30 ps
Rise/Fall Time Mismatch
T
TX-RF-
MIISMATCH
(Note 7) 20 ps
Same-Pair Output Skew (Note 5) T
SK
f = 2.5GHz 10 15 ps
Lane-to-Lane Output Skew
(Note 5)
T
SKL
f = 2.5GHz -50 +50 ps
Deterministic Jitter (Note 5) T
TX-DJ-DD
K28.5± pattern, 5.0GT/s, AC coupled, R
L
=
50, effects of deemphasis deembedded
15 ps
P-P
Random Jitter T
TX-RJ-DD
DIO.2 pattern 1.4 ps
RMS
Electrical Idle Entry Delay
T
TX-IDLE-
SET-TO-IDLE
From input to output 15 ns
Electrical Idle Exit Delay
T
TX-IDLE-TO-
DIFF-DATA
From input to output 12 ns
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, C
CL
= 75nF coupling capacitor on each output, R
L
= 50Ω resistor on each output, T
A
= 0°C to +70°C, unless
otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 3)