Datasheet

_______________________________________________________________________________________ 3
MAX3945
1.0625Gbps to 11.3Gbps,
SFP+ Dual-Path Limiting Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.85V to 3.63V, CML receiver output is AC-coupled to differential 100I load, C
CAZ
= 0.1FF, T
A
= -40NC to +85NC. Registers
are set to default values, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25NC, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
External RPMIN Filter Capacitor 100 pF
OUTPUT SPECIFICATIONS
Differential Output Resistance
ROUT+/ROUT-
R
OUTDIFF
75 100 125
I
Output Return Loss
SDD22
DUT is powered on, f P 5GHz
13
dB
DUT is powered on, f P 16GHz
7
SCC22
DUT is powered on, 1GHz < f P 5GHz
10
DUT is powered on, 1GHz < f P 16GHz
6
Differential Output-Voltage High
5mV
P-P
P V
IN
P 1200mV
P-P
, RATE_SEL = 0,
SET_CML[7:0] = 169d (decimal)
595 800 1005
mV
P-P
10mV
P-P
P V
IN
P 1200mV, RATE_SEL = 1,
SET_CML[7:0] = 181d
595 800 1005
Differential Output-Voltage
Medium
10mV
P-P
P V
IN
P 1200mV
P-P,
RATE_SEL = 1, SET_CML[7:0] = 91d
300 400 515 mV
P-P
SET_CML DAC Range 60 255 Decimal
Differential Output Signal When
Squelched (Note 1)
Outputs AC-coupled, SET_CML[7:0] =
181d, at 8.5Gbps, SQ_EN = 1
6 15 mV
P-P
Data Output Transition Time
(20% to 80%) (Note 1)
t
R
/t
F
60mV
P-P
P V
IN
P 400mV
P-P
at 10.32Gbps,
RATE_SEL = 1, V
DIFF_ROUT
= 400mV
P-P
,
RXDE_EN = 0, input transition time 25ps,
pattern 11110000
26 35
ps
10mV
P-P
P V
IN
P 1200mV
P-P
at 1.25Gbps,
RATE_SEL = 0, V
DIFF_ROUT
= 800mV
P-P
,
input transition time 260ps, pattern 11110000
52 90
TRANSFER CHARACTERISTICS
Deterministic Jitter
(Notes 1, 2)
DJ
10mV
P-P
P V
IN
P 1200mV
P-P
at 8.5Gbps,
RATE_SEL = 1, V
DIFF_ROUT
= 400mV
P-P
,
RXDE_EN = 0, input transition time 28ps
4 8
ps
P-P
60mV
P-P
P V
IN
P 400mV
P-P
at 10.32Gbps,
RATE_SEL = 1, V
DIFF_ROUT
= 400mV
P-P
,
RXDE_EN = 0, input transition time 28ps
4 9
60mV
P-P
P V
IN
P 400mV
P-P
at 11.3Gbps,
RATE_SEL = 1, V
DIFF_ROUT
= 400mV
P-P
,
RXDE_EN = 0, input transition time 28ps
4 9
10mV
P-P
P V
IN
P 1200mV
P-P
at 1.25Gbps,
RATE_SEL = 0, BW1 = 0, BW0 = 0,
V
DIFF_ROUT
= 800mV
P-P
, input transition
time 260ps
9 30
10mV
P-P
P V
IN
P 1200mV
P-P
at 4.25Gbps,
RATE_SEL = 0, BW1 = 1, BW0 = 1,
V
DIFF_ROUT
= 800mV
P-P
, input transition
time 28ps
5 10