MAX3996CGP Maxim Integrated Products, MAX3996CGP Datasheet - Page 11

• Manufacturer Part Number: MAX3996CGP
• Description: Laser Driver +3.0V to +5.5V, 2.5G bps VCSEL and Laser
• Manufacturer: Maxim Integrated Products

Specifications of MAX3996CGP

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 8. R
Figure 9. Large Modulation Current
*FERRITE BEAD
0.01µF
0.01µF
C
1000
PORDLY
10
1
TX_DISABLE
FAULT
IN+
IN-
PORDLY
1
TC
1000ppm
R
R
1500ppm
500ppm
TC
TC
L
MODSET MON1 MON2 COMP GND
=
25Ω
vs. R
R
MOD
MAX3996
MOD
V
V
CC
CC
______________________________________________________________________________________
N.C.
for Various Conditions
SHDNDRV
10
C
COMP
R
MOD
OUT-
OUT+
BIAS
OPTIONAL SHUTDOWN
MD
(k
CIRCUITRY
Ω
L2*
L3*
2000ppm
1.8kΩ
V
V
)
CC
CC
2500ppm
0.01µF
0.01µF
25Ω
100
30mA
3000ppm
25mA
20mA
L1*
V
15mA
CC
R
SET
10mA
3500ppm
3.0V to 5.5V, 2.5Gbps VCSEL
5mA
1000
0.01µF
The MAX3996 can be used in several configurations.
For modulation currents less than 20mA, Maxim recom-
mends the configuration shown in the Typical
Application Circuit. Outputs greater than 20mA could
cause the voltage at the modulator output to be less
than V
large currents, Maxim recommends the configuration in
Figure 9. A differential configuration is in Figure 10.
To reduce deterministic jitter, add a ferrite bead induc-
tor (L1) between the BIAS pin and the cathode of the
laser. Select L1 to have an impedance >100Ω between
f = 10MHz and f = 2GHz, and a DC resistance < 3Ω;
Maxim recommends the Murata BLM11HA102SG.
These inductors are also desirable for connecting the
OUT+ and OUT- pins to V
The IC is designed to drive a common anode laser with
a photodiode. A servo-control loop is formed by the
internal NPN bias-driving transistor, the laser diode, the
monitor diode (R
(Figure 11). The voltage at MD is stabilized to 1.1V. The
Figure 10. Differential Configuration
*FERRITE BEAD
0.01µF
0.01µF
C
CC
PORDLY
TX_DISABLE
FAULT
IN+
IN-
PORDLY
Determine Modulator Configuration
- 1V, which might degrade laser output. For
TC MODSET MON1 MON2 COMP GND
R
TC
and Laser Driver
Programming Laser Power and
SET
R
Designing the Bias Filter and
MOD
MAX3996
), and the power-control amplifier
V
V
CC
CC
N.C.
CC
.
Bias Fault Threshold
Output Pullup Beads
SHDNDRV
C
COMP
OUT+
OUT-
BIAS
MD
0.01µF
0.01µF
L1*
L2*
V
R
CC
SET
11