155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
/MAX347B
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.97V to +3.63V, CML output load is 50Ω to V , T = -40°C to +85°C. Typical values are at V
= +3.3V and T = +25°C,
CC A
CC
A
unless otherwise specified.) (Note 1)
PARAMETER
Input-Referred Noise
Low-Frequency Cutoff
LOS Hysteresis
SYMBOL
CONDITIONS
MIN
TYP
120
6.4
MAX
UNITS
μV
V
= 4mV
(Note 4)
150
IN
P-P
RMS
kHz
10log(V
/ V
) (Note 4)
ASSERT
1.25
2.3
dB
DEASSERT
MAX3747/MAX3747A (Notes 4, 8)
MAX3747B (Notes 4, 8, 9)
LOS Assert/Deassert Time
40.0
μs
Low LOS Assert Level
Low LOS Deassert Level
Medium LOS Assert Level
Medium LOS Deassert Level
High LOS Assert Level
High LOS Deassert Level
TTL/CMOS I/O
V
TH
V
TH
V
TH
V
TH
V
TH
V
TH
= -1.3V (Notes 4, 10)
= -1.3V (Notes 4, 10)
= -0.68V (Notes 4, 10)
= -0.68V (Notes 4, 10)
= -0.114V (Notes 4, 10)
= -0.114V (Notes 4, 10)
2.5
4.1
6.2
5.9
9.3
mV
P-P
P-P
P-P
P-P
P-P
P-P
mV
mV
mV
mV
mV
22.0
36.0
29.0
44.8
53.7
86.0
31.0
57.0
63.6
115
V
1.35
-
V
1.3V
-
V
1.19
-
CC
CC
CC
V
REF
Voltage
V
REF
V
LOS Output High Voltage
LOS Output Low Voltage
DISABLE Input High
V
R
R
= 4.7kꢀ to 10kꢀ to V
= 4.7kꢀ to 10kꢀ to V
(3V)
2.4
2.0
V
V
OH
LOS
CC_HOST
V
(3.6V)
0.4
OL
LOS
CC_HOST
V
V
IH
DISABLE Input Low
V
0.8
10
V
IL
DISABLE Input Current
R
LOS
= 4.7kꢀ to 10kꢀ to V
μA
CC_HOST
Note 1: The data-input transition time is controlled by a 4th-order Bessel filter with f
= 0.75 x 2.667GHz for all data rates of
-3dB
2.667Gbps and below. The f
= 0.75 x 3.2GHz for a data rate of 3.2Gbps.
-3db
Note 2: Supply current is measured with unterminated outputs or with AC-coupled output termination (see Figure 1).
Note 3: Between sensitivity and overload, all AC specifications are met and the output is 0.95 x limited output amplitude.
Note 4: Guaranteed by design and characterization.
Note 5: The deterministic jitter (DJ) caused by the input filter is not included in the DJ generation specification.
23
Note 6: The PRBS 2 - 1 equivalent pattern consists of a K28.5 pattern plus 240 ones plus K28.5 pattern plus 240 zeros.
Note 7: Random jitter was measured without using a filter at the input.
Note 8: The signal at the input is switched between two amplitudes, Signal_ON and Signal_OFF, as shown in Figure 2A.
Note 9: The signal at the input is switched between 1.2V
and Signal_OFF as shown in Figure 2B.
(see Figure 5).
P-P
Note 10: V is the voltage at pin 5 referenced to V
TH
CC
_______________________________________________________________________________________
3