參數(shù)資料
型號(hào)： MAX3286-MAX3299
廠商： Maxim Integrated Products, Inc.
英文描述： 3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers
中文描述： 3.0V至5.5V，1.25Gbps/2.5Gbps局域網(wǎng)激光驅(qū)動(dòng)器
文件頁數(shù)： 13/28頁
文件大?。?/td> 1446K
代理商： MAX3286-MAX3299
M
3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
______________________________________________________________________________________
13
with photodiode. The POL and
POL
inputs determine
the laser pinning (common cathode, common anode)
and affect the smooth-start circuits (Table 4).
Common Cathode with Photodiode
(Optical Feedback)
In the common cathode with photodiode configuration,
a servo control loop is formed by external PNP Q1, the
laser diode, the monitor diode, R
SET
, and the power-
control amplifier (Figure 9). The voltage at MD is stabi-
lized to 1.7V. The monitor photodiode current (I
D
) is set
by (V
REF
- V
MD
) / R
SET
= 0.95 / R
SET
. Determine the
desired monitor current (I
D
), then select R
SET
= 0.95 / I
D
.
The APC loop is compensated by C
BIASDRV
. A capacitor
must be placed from BIASDRV to V
CC
to ensure low-
noise operation and to reject power-supply noise. The
time constant governs how quickly the laser bias current
reacts to a change in the average total laser current
(I
BIASDRV
+ I
MOD
). A capacitance of 0.1μF is sufficient
to obtain a loop time constant in excess of 1μs, provid-
ed that R
DEG
is chosen appropriately. Resistor R
DEG
might be necessary to ensure the APC loop’s stability
when low bias currents are desired.
The voltage across R
DEG
should not be larger than
250mV at maximum bias current.
The discrete components used with the common cath-
ode with photodiode configuration are:
R
SET
= 0.95 / I
D
C
BIASDRV
= 0.1μF (typ)
R
DEG
= 0.25 / I
BIAS(MAX)
POL
DESCRIPTION
MAX3286/MAX3296
VCC
Common cathode with
photodiode
DEVICE
Table 4. POL Pin Setup for Each Laser Configuration Type
POL
GND
LASER PINNING
MAX3287/MAX3297
—
—
MAX3286/MAX3296
VCC
Common cathode without
photodiode
MAX3288/MAX3298
—
GND
—
MAX3286/MAX3296
GND
Common anode with
photodiode
MAX3289/MAX3299
—
VCC
—
MAX3286/MAX3296
VCC
GND
VCC
GND
Not allowed; fault occurs
—
MAX3286/MAX3296
Not allowed; fault occurs
—
V
CC
1000
1
1
100
1000
10
R
MOD
(k
)
R
T
)
10
3500ppm
3000ppm
2000ppm
2500ppm
1000ppm
1500ppm
500ppm
5mA
10mA
15mA
20mA
25mA
30mA
R
L
= 25
Figure 8a. R
TC
vs. R
MOD
for Various Conditions
0
10
5
20
15
35
30
25
40
0
4
2
6
8
10
12
14
R
MOD
(k
)
L
M
)
NOTE: R
TC
= OPEN
25
LOAD
10
LOAD
50
LOAD
Figure 8b. Laser-Modulation Current vs. R
MOD
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