參數(shù)資料
型號(hào)： MAX3865EGJ
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 其它接口
英文描述： 2.5Gbps Laser Driver with Automatic Modulation Control
中文描述： SPECIALTY INTERFACE CIRCUIT, CQCC32
封裝： 5 X 5 MM, 0.90 MM HEIGHT, QFN-32
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 633K
代理商： MAX3865EGJ
M
Mark-Density Compensation
in APC Mode
When mark density is expected to deviate from 50% for
periods exceeding 5% of the APC time constant, the
AMCSET pin should be programmed to compensate
the APC set point. The time constant is determined by
the laser to monitor diode gain.
(For example,
τ
APC
= 150ns for G
MD
= 0.01mA/mA.)
Set the estimated peak-to-peak monitor diode current
by the following equation:
Alternatively, a current DAC at the AMCSET pin can set
the monitor diode current by:
Estimated I
MD(p-p)
= 5
I
DAC
Programming the Maximum
Modulation Current
In AMC mode, the modulation current needs a limit if
the loop becomes open. R
MODMAX
sets the maximum
allowed modulation current. The modulation current is
proportional to the current through R
MODMAX
. Select
the maximum I
MOD
programming resistor as follows:
Alternatively, a current DAC forcing I
DAC
from the
MODMAX pin may set the current maximum
I
MODMAX
= 320
I
DAC
When the AMC loop is enabled, the actual modulation
current is reduced from the maximum value to maintain
constant peak-to-peak current from the monitor diode.
With closed-loop control, the modulation current will be
determined by the transfer function of the monitor diode
to laser diode current. For example, if the transfer func-
tion to the monitor diode is 10.0μA/mA, then setting I
MD
for 500μA will result in I
MOD
equal to 50mA.
In manual mode, the modulation current I
MOD
is set by
R
MODMAX
.
Programming the Peak-to-Peak Monitor
Diode-Current Set Point
The AMCSET pin controls the set point for the peak-to-
peak monitor diode current in AMC mode. The peak-to-
peak value of the monitor diode current can be
programmed with a resistor as follows:
Alternatively a current DAC at the AMCSET pin can set the
monitor diode current by:
I
MD(p-p)
= 5
I
DAC
Laser Gain Compensation
The MAX3865 may be used in closed-loop operation
with a wide variety of laser-to-monitor diode gains.
Table 3 shows the connection of the MD_X pin for dif-
ferent current-gain ranges.
Current Monitor Outputs
The MAX3865 provides bias and modulation current
monitors. The BIASMON output sinks a current propor-
tional to the bias current:
The MODMON pin sinks a current proportional to the
laser modulation current:
The BIASMON and MODMON pins should not be
allowed to drop below 1.8V. They should be tied to V
CC
when not in use.
I
I
MODMON
MOD
32
=
I
I
BIASMON
BIAS
48
=
I
V
R
k
MD p p
(
AMCSET
)
.
=
×
+
5
1 2
2
I
V
R
k
MODMAX
MODMAX
=
×
+
320
1 2
.
2
Estimated I
V
R
k
MD p p
(
AMCSET
.
)
=
×
+
5
1 2
2
G
I
I
MD
MONITOR
LASER
=
τ
APC
MD
ns
G
=
1 5
2.5Gbps Laser Driver with Automatic
Modulation Control
10
______________________________________________________________________________________
LASER-TO-MONITOR
DIODE-CURRENT GAIN
<0.005
0.005 to 0.02
>0.02
MD_X SHUNT
CONNECTION
GND or Open
(Open or GND) or MD
MD
Table 3. Connection of the MD_X Pin
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