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MAX3668 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX3668
Description  3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX3668 Datasheet(HTML) 5 Page - Maxim Integrated Products

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+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
_______________________________________________________________________________________
5
1000
0.1
1.4
1.8
1.6
2.2
2.6
AVAILABLE BIAS CURRENT
vs. MAXIMUM BIAS SET RESISTOR
1
10
100
RBIAS (k
Ω)
2.0
2.4
VCC = +3.3V
VCC = +3.3V, + 5V
CLOSED-LOOP OPERATION
VCC = +5V
0
5
15
10
20
25
-25
155
65
245
335
425
515
DISTRIBUTION OF MODULATION CURRENT
STABILITY (WORST CASE)
MODULATION DIODE CURRENT STABILITY (ppm/°C)
TA = -40°C TO +85°C
IMOD = 5mA
0
5
15
10
20
25
-52
-88
20
92
160
DISTRIBUTION OF MONITOR DIODE CURRENT
STABILITY (WORST CASE)
MONITOR DIODE CURRENT STABILITY (ppm/°C)
TA = -40°C TO +85°C
IMD = 18
µA
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
Pin Description
NAME
FUNCTION
1, 2, 6, 15,
17, 20, 24
VCC
Positive Supply Voltage
29
APCSET
APC Set Resistor. A resistor connected from this pad to ground sets the desired average opti-
cal power. The resulting current is equal to the desired DC monitor diode current. Connect a
100k
Ω resistor from this pad to ground if APC is not used.
PIN
3
DATA+
Positive PECL Data Input
4
DATA-
Negative PECL Data Input
32
BIASMAX
Maximum Bias Set Resistor. A resistor from this pad to ground sets the maximum laser bias
current. The APC function can subtract from this maximum value but cannot add to it. This
resistor controls the bias-current level when the APC loop is not used.
31
MODSET
Modulation Set Resistor. A resistor from this pad to ground sets the laser modulation current.
5, 7, 8, 10,
14, 21, 22, 30
GND
Ground
12, 13, 26,
27, 28
N.C.
No Connection. Leave unconnected.
11
FAIL
TTL Output. Indicates APC failure when low. Internally pulled high through a 6k
Ω resistor.
9
ENABLE
TTL/CMOS Enable Input. High for normal operation, low to disable laser bias and modulation
currents. Internally pulled high.
16
BIAS
Laser Bias Current Output. Isolate from laser with a ferrite bead.
19
OUT-
Negative Modulation Current Output. IMOD flows into this pad when the input signal is low.
Connect this pad to VCC through a 6.3
Ω resistor.
18
OUT+
Positive Modulation Current Output. IMOD flows into this pad when the input signal is high.
Connect this pad to AC coupling network.
23
MD
Monitor Photodiode Connection. Connect this pad to the monitor photodiode anode. A capaci-
tor to ground is required to filter high-speed AC monitor photocurrent.
25
CAPC
APC Compensation Capacitor. A 0.1µF capacitor connected from this pad to ground controls
the dominant pole of the automatic power control (APC) feedback loop.


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