MAX3863ETJ+ Maxim Integrated Products, MAX3863ETJ+ Datasheet - Page 10

• Manufacturer Part Number: MAX3863ETJ+
• Description: IC LASR DRVR 2.7GBPS 3.6V 32TQFN
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Driver (Fiber Optic)r

Specifications of MAX3863ETJ+

• Data Rate: 2.7Gbps
• Number Of Channels: 1
• Voltage - Supply: 3.15 V ~ 3.6 V
• Current - Supply: 58mA
• Current - Modulation: 80mA
• Current - Bias: 100mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-WFQFN Exposed Pad
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

programming resistor. See the I
graph in the Typical Operating Characteristics , and
select the value of R
required current at +25°C.
The APCSET pin controls the set point for the monitor
diode current. An internal current regulator establishes the
APCSET current in the same manner as the BIASMAX pin.
See the I
Characteristics , and select the value of R
responds to the required current at +25°C.
2.7Gbps Laser Driver with Modulation
Compensation
Figure 3. Functional Diagram
10
Programming the Monitor Diode Current
______________________________________________________________________________________
MD
vs. R
MODMON
BIASMON
I
MDMON
BIASMAX
DATA
DATA
V
CLK
CLK
V
APCSET
CC
CC
I
MD
BIASMAX
=
CURRENT
MONITOR
=
5
graph in the Typical Operating
200
×
R
EN
APCSET
×
that corresponds to the
1 2 .
BIASMAX
R
V
V
BIASMAX
bg
1 2 .
x200
D
D
V
I
MODS
R
APCSET
MODSET
Q
vs. R
Set Point
1
0
MUX
RTEN
BIASMAX
that cor-
R
I
MODC
MODCOMP
+
-
V
bg
x200
∑
Two current sources combine to make up the modula-
tion current of the MAX3863 as seen in Figure 3. A con-
stant modulation current programmed at the MODSET
pin and a current, proportional to I
under control by the APC loop. See the Laser Current
Compensation Requirements section for the desired
values for I
MODSET is established by an internal current regulator,
which maintains the bandgap voltage of 1.2V
across the external programming resistor. See the I
MOD
Characteristics and select the value of R
corresponds to the required current at +25°C. The cur-
rent proportional to I
the MODCOMP pin. Open circuiting the MODCOMP
pin can turn off the interaction between I
5Ω
R
BIASMAX
vs. R
V
bg
APCFILT1
APCFILT2
Programming the Modulation Current
MODN
x5
MOD
BIAS
MD
R
MODSET
APCSET
MODS
I
I
V
MOD
BIAS
I
CC
MD
V
and K. The portion of I
CC
C
BIAS
APC
C
graph in the Typical Operating
D
25Ω
is set by an external resistor at
R
D
V
CC
BIAS
500pF
BIAS
, that varies
MODSET
MOD
and I
set by
MOD
that
.