Rainbow Electronics MAX3646 - Manual (Page 5)

MAX3646
155Mbps to 622Mbps SFF/SFP
Laser Driver with Extinction Ratio Control
_______________________________________________________________________________________ 5
RANDOM JITTER vs.
MODULATION CURRENT
MAX3646 toc10
I MOD (mA)
RJ (ps
RMS
)
80 70 50 60 20 30 40 10
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
0 90
COMPENSATION (K) vs. R MODBCOMP
MAX3646 toc11
R MODBCOMP (kΩ)
K (mA/mA)
10 1 0.1 0.01
0.1
1
10
0.01
0.001 100
TEMPERATURE COMPENSATION vs.
R TH_TEMP (R MODTCOMP = 500Ω)
MAX3646 toc12
TEMPERATURE (°C)
I MOD
(mA)
80 70 60 50 40 30 20 10 0
40
50
60
70
80
90
100
30
-10 90
R TH_TEMP = 12kΩ
R TH_TEMP = 7kΩ
R TH_TEMP = 4kΩ
R TH_TEMP = 2kΩ
TEMPERATURE COMPENSATION vs.
R TH_TEMP (R MODTCOMP = 10kΩ)
MAX3646 toc13
TEMPERATURE (°C)
I MOD
(mA)
80 70 60 50 40 30 20 10 0
32
34
36
38
40
42
44
30
-10 100 90
R TH_TEMP = 12kΩ
R TH_TEMP = 7kΩ
R TH_TEMP = 4kΩ
R TH_TEMP = 2kΩ
HOT PLUG WITH TX_DISABLE LOW
MAX3646 toc14
20ms/div
V CC
FAULT
TX_DISABLE
LASER
OUTPUT
0V
3.3V
t_init = 59.6ms
LOW
LOW
TRANSMITTER ENABLE
MAX3646 toc15
10µs/div
V CC
FAULT
TX_DISABLE
LASER
OUTPUT
3.3V
t_on = 23.8µs
LOW
HIGH
LOW
TRANSMITTER DISABLE
MAX37646 toc16
20ns/div
V CC
FAULT
TX_DISABLE
LASER
OUTPUT
3.3V
91.2ns
LOW
HIGH
LOW
RESPONSE TO FAULT
MAX3646 toc17
400ns/div
V PC_MON
FAULT
TX_DISABLE
LASER
OUTPUT
t_fault = 160ns
EXTERNALLY
FORCED FAULT
FAULT RECOVERY TIME
MAX3646 toc18
40ms/div
V PC_MON
FAULT
TX_DISABLE
LASER
OUTPUT
t_init = 58ms
EXTERNALLY
FORCED FAULT
LOW
LOW LOW
HIGH
HIGH
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, C
APC
= 0.01µF, I
BIAS
= 20mA, I
MOD
= 30mA, T
A
= +25°C, unless otherwise noted.)