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參數(shù)資料
| 型號(hào)： | MAX3656E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual LVDS Transmitter/Receiver 16-SOIC -40 to 85 |
| 中文描述： | 155Mbps至2.5Gbps突發(fā)模式激光驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 734K |
| 代理商： | MAX3656E |
M
Programming the Bias Current
When the MAX3656 is used in open-loop operation, the
R
BIASMAX
resistor determines the bias current. To
select this resistor, determine the required bias current.
See the I
BIASMAX
vs. R
BIASMAX
graph in the
Typical
Operating Characteristics
, and select the value of
R
BIASMAX
that corresponds to the required current. For
open-loop operation, connect a 50k
resistor from
R
APCSET
to GND, and leave the MD pin open.
When using the MAX3656 in closed-loop operation, the
R
BIASMAX
resistor sets the maximum bias current avail-
able to the laser diode over temperature and lifetime.
The APC loop can subtract from this maximum value,
but cannot add to it. See the I
BIASMAX
vs. R
BIASMAX
graph in the
Typical Operating Characteristics
and
select the value of R
BIASMAX
that corresponds to the
end-of-life bias current at +85
°
C.
Programming the APC Loop
When using the MAX3656
’
s APC feature, program the
average optical power by adjusting the APCSET resis-
tor. To select this resistor, determine the desired moni-
tor current to be maintained over temperature and
lifetime. See the I
MD
vs. R
APCSET
graph in the
Typical
Operating Characteristics
and select the value of
R
APCSET
that corresponds to the required current.
Setting the LONGB Input Pin
Set the LONGB pin according to Table 2 to optimize
APC loop operation.
Interfacing with Laser Diodes
To minimize optical output aberrations caused by sig-
nal reflections at the electrical interface to the laser
diode, a series-damping resistor (R
D
) is required (see
the
Functional Diagram
). Additionally, the MAX3656
outputs are optimized for a 15
load. Therefore, the
series combination of R
D
and R
L
(where R
L
represents
the laser-diode resistance) should equal 15
. Typical
values for R
D
are 8
to 13
. For best performance, a
bypass capacitor (0.01μF typical) should be placed as
close as possible to the anode of the laser diode. An
RC shunt network between the OUT+ pin and ground
helps minimize optical output aberrations. Starting val-
ues for most coaxial lasers are R = 56
in series with C
= 10pF. Adjust these values experimentally until the
optical output waveform is optimized (refer to
Application Note HFAN 3.0:
Interfacing Maxim
’
s Laser
Drivers with Laser Diodes
).
Input Termination Requirements
The MAX3656 data and BEN inputs are internally biased.
Although the inputs are compatible with LVPECL signals,
it is not necessary to drive the MAX3656 with a standard
LVPECL signal. While DC-coupled, the MAX3656 oper-
ates properly as long as the specified common-mode
voltage and differential voltage swings are met.
Because of the on-chip biasing network (Figure 3), the
MAX3656 inputs self-bias to the proper operating point
to accommodate AC-coupling.
See Figures 4 and 5 for connecting to PECL or CML
data outputs.
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
10
______________________________________________________________________________________
Table 2. Setting the LONGB Input Pin
LONGB
0
CONDITION
Burst on-time
≤
1.2μs
Burst on-time
>
1.2μs or
continuous mode operation
0 or 1
1
Data rates of 155Mbps
Figure 3. MAX3656 Internal Biasing
V
CC
V
CC
V
CC
5k
V
CC
5k
16k
24k
IN+
IN-
V
CC
V
CC
V
CC
5k
V
CC
5k
16k
24k
BEN+
BEN-
MAX3656
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3656E/D | 功能描述:激光驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3656ETA | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX3656ETG | 功能描述:激光驅(qū)動(dòng)器 .155-2.5Gbps Burst Mode Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3656ETG+ | 功能描述:激光驅(qū)動(dòng)器 .155-2.5Gbps Burst Mode Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3656ETG+ | 制造商:Maxim Integrated Products 功能描述:IC LASER DIODE DRIVER 2.5GBPS TQFN-24 |
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