MAX3646 Maxim Integrated Products, MAX3646 Datasheet - Page 5

• Manufacturer Part Number: MAX3646
• Description: 155Mbps to 622Mbps Sff/sfp Laser Driver
• Manufacturer: Maxim Integrated Products

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