參數(shù)資料
型號(hào)： MAX3656
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(yè)數(shù)： 9/16頁(yè)
文件大?。?/td> 734K
代理商： MAX3656
loop enters its fine-adjustment mode of operation and
adjusts the bias current to match the level set by the
APCSET resistor. There are three different cases in
which the APC loop starts initialization, and each has a
unique initialization time. These cases are defined
as follows:
Continuous-Mode Power-Up
In continuous-mode power-up, the chip is enabled
(
EN
= low) and the burst-enable input is high (BEN =
high) when power is applied to the laser driver. APC
loop initialization begins when the power-supply volt-
age rises above the minimum specified limit of +3.0V.
The BEN input remains high indefinitely and the laser
driver operates in continuous (nonbursting) mode. In
this case, the initialization time is 12μs (typ).
Chip-Enable Reset
In chip-enable reset, the power-supply voltage is
within the specified limits and BEN is high. The
chip-enable input (
EN
) is initially high (chip dis-
abled and APC loop reset), and then it is driven low
(chip-enabled). In this case, APC loop initialization
begins when the voltage at
EN
drops below the
specified
EN
input low voltage of 0.8V. After initial-
ization begins, the laser driver can be operating in
burst mode (BEN toggling high and low) or continu-
ous mode (BEN = high). In this case, the initializa-
tion time is 2.1μs (typ).
Burst-Mode Startup
In burst-mode startup, the power-supply voltage is
within the specified limits and the chip is enabled
(
EN
= low). The burst-enable input is low (BEN =
low) and has not been in the high state since the
APC loop was reset. APC loop initialization begins
when the BEN input is driven high. After initialization
begins, the laser driver can be operating in burst
mode (BEN toggling high and low) or continuous
mode (BEN = high). In this case, the initialization
time is 1.6μs (typ).
In each of the three cases listed, initialization is complete
within three bursts (bursts must comply with specified
burst on- and burst off-time) or the time specified in the
Electrical Characteristics
table, whichever comes first.
Burst-Mode Operation
The bias and modulation outputs (BIAS+ and OUT+)
can be switched on and off quickly using the differential
burst-enable inputs (BEN+ and BEN-). Once the APC
loop has initialized, the bias and modulation outputs are
switched on when BEN+ = high and BEN- = low and are
switched off when BEN+ = low and BEN- = high.
When BEN is switched on, the laser driver sinks the bias
and modulation currents set by the APCSET, BIASMAX,
and MODSET resistors within the maximum BEN delay
time of 2.3ns. For stable APC loop operation, the mini-
mum burst length is limited to the burst on-time listed in
the
Electrical Characteristics
table. The maximum burst-
on time is unlimited.
When BEN is switched off, the bias and modulation cur-
rents fall below the specified bias-off and modulation-
off currents within the maximum burst disable delay
time of 2.0ns. For stable APC loop operation, the mini-
mum burst off-time is limited to the value listed in the
Electrical Cha
r
acteristics
table. The maximum burst off-
time is unlimited.
Short-Circuit Protection
The MAX3656 provides short-circuit protection for the
modulation and bias-current sources. If BIASMAX or
MODSET is shorted to ground, the bias and modulation
outputs are turned off.
Design Procedure
When designing a laser transmitter, the optical output is
usually expressed in terms of average power and
extinction ratio. Table 1 shows the relationships helpful
in converting between the optical average power and
the modulation current. These relationships are valid if
the mark density and duty cycle of the optical wave-
form are 50%.
Programming the Modulation Current
For a given laser power (P
AVG
), slope efficiency (
η
),
and extinction ratio (r
e
), the modulation current can be
calculated using Table 1. See the I
MOD
vs. R
MODSET
graph in the
Typical Operating Characteristics
, and
select the value of R
MODSET
that corresponds to the
required current at +25
°
C.
M
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
_______________________________________________________________________________________
9
Table 1. Optical Power Definition
PARAMETER
Average power
Extinction ratio
Optical power high
Optical power low
Optical amplitude
SYMBOL
P
AVG
r
e
P
1
P
0
P
P-P
RELATION
P
AVG
= (P
0
+ P
1
) / 2
r
e
= P
1
/ P
0
P
1
= 2P
AVG
×
r
e
/ (r
e
+ 1)
P
0
= 2P
AVG
/ (r
e
+ 1)
P
P-P
= P
1
- P
0
Laser slope
efficiency
η
η
= P
P-P
/ I
MOD
Modulation current
I
MOD
I
MOD
= P
P-P
/
η
(2 x I
MD
/ I
MOD
)((r
e
- 1) /
(r
e
+ 1))
Laser-to-monitor
diode gain
A
LMD
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