19-1311; Rev 3; 1/03
KIT
ATION
EVALU
E
BL
AVAILA
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
General Description
Features
o
Single +3.3V or +5.0V Operation
o
Automatic Average Power Control
o
Bias Current and Modulation Current Monitor
Outputs
o
TTL-Compatible Disable Input
o
Temperature-Compensated Reference
o
PECL-Compatible Data Inputs
MAX3667
The MAX3667 is a complete, +3.3V laser driver with
automatic power control (APC), designed for SDH/
SONET applications up to 622Mbps. It accepts differ-
ential PECL inputs, provides single-ended bias and
modulation currents, and operates over a -40°C to
+85°C temperature range.
A temperature-stabilized reference voltage simplifies
laser current programming. It allows external program-
ming of the modulation current between 5mA
P-P
and
60mA
P-P
, and of the bias current between 5mA and
90mA.
The APC function, which incorporates a monitor photo-
diode, an external resistor, and two external capacitors,
maintains constant laser output power. Two current
monitors provide high-speed signals that are directly
proportional to the bias and modulation currents.
Additional features include disable/enable control and
a slow-start feature with a minimum turn-on time of
50ns. The MAX3667 is available in die form and in a
32-pin TQFP package.
Ordering Information
PART
MAX3667ECJ
MAX3667E/D
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
Dice*
*Dice
are designed to operate from -40°C to +85°C but are
tested and guaranteed only at T
j
= +25°C.
Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Repeaters
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+3.3V
0.1µF
+3.3V
C
COMP
1µF
50Ω
MONITOR
DIODE
LASER
DIODE
0.1µF
COMP
BIASMON
MODMON
APCSET
V
CC
MD
IMOD
1µF
R
DAMP
4.7Ω
MAX3691
4:1
SERIALIZER
WITH
CLOCK GEN
130Ω
130Ω
IN+
PECL
IN-
IBIAS
GND
DISABLE
MODSET
BIASSET
APC
R
FILT
22Ω
MAX3667
0.01µF
470nH
100Ω
82Ω
82Ω
C
APC
1nF
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
MAX3667
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..............................................-0.5V to +7.0V
Current into IBIAS..............................................-50mA to 350mA
Current into IMOD .............................................-50mA to 200mA
Current into MD ..................................................................±7mA
Voltage at APC, MODMON,
BIASMON, COMP....................................-0.5V to (V
CC
+ 0.5V)
Voltage at IN+, IN-, DISABLE, MODSET,
BISASSET, APCSET, PULLUP..................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +85°C)
TQFP (derate 11.1mW/°C above +85°C) ......................721mW
Operating Temperature Range ...........................-40°C to +85°C
Operating Junction Temperature Range (die) ..-55°C to +175°C
Processing Temperature (die) .........................................+400°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V ±5%, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Supply Current (Note 3)
Bias Current Range
Bias Off Current
Modulation Off Current
Internal Pullup Resistor
(Note 6)
Reference Voltage (Note 7)
Bias Current Stability
SYMBOL
I
CC
I
BIAS
I
BIAS
I
BIAS
R
PULLUP
V
REF
Disable = high or low
R
BIASSET
= 2kΩ, open loop (Note 8)
R
BIASSET
= 33.2kΩ, open loop (Note 8)
R
BIASSET
= 2kΩ, closed loop (Notes 4, 9)
Modulation Current Stability
BIASMON to IBIAS Gain
MODMON to I
QMOD
Gain
I
BIASSET
to IBIAS Gain
I
MODSET
to I
QMOD
Gain
I
APCSET
to IBIAS Gain
PECL Input High Voltage
PECL Input Low Voltage
PECL Input High Current
PECL Input Low Current
TTL Disable High Voltage
TTL Disable Low Voltage
TTL Disable High Current
TTL Disable Low Current
2
A
I
A
I
A
I
A
I
A
I
V
IH
V
IL
I
IH
I
IH
V
DIH
V
DIL
I
DIH
I
DIL
1
4
V
IN
= 2.14V
V
IN
= 1.82V
2.0
0.8
4.5
2
R
MODSET
= 2kΩ, open loop (Note 8)
R
MODSET
= 33.2kΩ, open loop (Note 8)
R
BIASSET
= 2kΩ
R
MODSET
= 2kΩ (Note 10)
R
BIASSET
= 2kΩ
R
BIASSET
= 33.2kΩ
R
MODSET
= 2kΩ (Note 10)
R
MODSET
= 33.2kΩ (Note 10)
R
APCSET
= 2kΩ
R
APCSET
= 33.2kΩ
30
26
145
128
152
152
135
164
2.14
1.82
10
10
1100
1100
38
33
170
160
190
190
170
205
46
40
200
195
230
230
205
250
(Note 5)
Disable = high
Disable = high
26
0.91
CONDITIONS
Closed loop (Note 4)
5
5
20
31
1.01
500
1000
480
ppm/°C
A/A
A/A
A/A
A/A
A/A
V
V
µA
µA
V
V
µA
µA
ppm/°C
MIN
TYP
112
MAX
133
90
250
250
35
1.11
UNITS
mA
mA
µA
µA
Ω
V
_______________________________________________________________________________________
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5.0V ±5%, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Supply Current (Note 3)
Bias Off Current
Modulation Off Current
BIASMON to IBIAS Gain
MODMON to I
QMOD
Gain
I
BIASSET
to IBIAS Gain
I
MODSET
to I
QMOD
Gain
I
APCSET
to IBIAS Gain
PECL Input High Voltage
PECL Input Low Voltage
PECL Input High Current
PECL Input Low Current
A
I
A
I
A
I
A
I
A
I
V
IH
V
IL
I
IH
I
IH
V
IN
= 3.84V
V
IN
= 3.52V
9
8
SYMBOL
I
CC
Disable = high
Disable = high
R
BIASSET
= 2kΩ
R
MODSET
= 2kΩ (Note 10)
R
BIASSET
= 2kΩ
R
BIASSET
= 33.2kΩ
R
MODSET
= 2kΩ (Note 10)
R
MODSET
= 33.2kΩ (Note 10)
R
APCSET
= 2kΩ
R
APCSET
= 33.2kΩ
26
145
143
168
188
132
145
3.84
3.52
CONDITIONS
Closed loop (Note 4)
MIN
TYP
134
2
32
38
33
180
180
240
230
166
182
40
220
215
315
285
200
220
MAX
160
250
250
UNITS
mA
µA
µA
A/A
A/A
A/A
A/A
A/A
V
V
µA
µA
MAX3667
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V ±5%, T
A
= -40°C to +85°C, R
LOAD
= 10Ω, unless otherwise noted.) (Notes 2, 11)
PARAMETER
Modulation Current Range
Output Rise Time
Output Fall Time
Output Aberrations
Pulse-Width Distortion
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
PWD
R
FILT
= 22Ω, R
DAMP
= 0Ω (Note 13)
SYMBOL
I
MOD
t
r
t
f
CONDITIONS
R
FILT
= 22Ω, R
DAMP
= 0Ω (Note 12)
V
CC
= 3.3V ±5%, 20% to 80%
V
CC
= 5.0V ±5%, 20% to 80%
V
CC
= 3.3V ±5%, 20% to 80%
V
CC
= 5.0V ±5%, 20% to 80%
MIN
5
270
205
425
315
±10
70
TYP
MAX
60
450
400
650
600
UNITS
mA
ps
ps
%
ps
Dice are tested at T
A
= +27°C.
Minimum voltage at IBIAS = V
CC
- 1.6V.
The sum of the currents flowing into V
CC
and PULLUP with R
BIASSET
= R
MODSET
= R
APCSET
= 2kΩ, IN+ = 1.82V,
IN- = 2.14V.
APC is connected to BIASSET for closed-loop operation.
Bias current range is guaranteed by the I
BIASSET
to IBIAS gain test.
R
PULL-UP
is connected between IMOD and PULLUP.
V
REF
is the voltage on BIASSET, MODSET, or APCSET with R
BIASSET
= R
MODSET
= R
APCSET
= 2kΩ.
APC is disconnected from BIASSET for open-loop operation.
Bias current stability is guaranteed by design and characterization.
I
QMOD
is the current flowing into the collector of Q
MOD
(Figure 1).
AC parameters are guaranteed by design and characterization.
Modulation current range is guaranteed by the I
MODSET
to I
QMOD
gain test.
Input signal is a 155Mbps 1-0 pattern. PWD = [(width of wider pulse) - (width of narrower pulse)] / 2.
_______________________________________________________________________________________
3
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
MAX3667
Typical Operating Characteristics
(T
A
= +25°C, V
CC
= +3.3V, unless otherwise noted.)
EYE DIAGRAM
(622Mbps, 1300nm LASER,
470MHz FILTER)
MAX3667-01
EYE DIAGRAM
(622Mbps, 10Ω LOAD)
MAX3667-02
OUTPUT JITTER
(622Mbps, 10Ω LOAD)
I
MOD
= 20mA
DIFF. INPUT = 1.7V
P-P
∆RMS
= 3.2ps
MAX3667-03
2
23
- 1PRBS
I
MOD
= 15mA
DIFF. INPUT = 640mV
P-P
2
23
- 1PRBS
I
MOD
= 15mA
DIFF. INPUT = 1.7V
P-P
52mV/
div
20mV/
div
5mV/
div
161ps/div
161ps/div
10ps/div
I
BIAS
vs. R
BIASSET
MAX3667-04
I
QMOD
vs. R
MODSET
MAX3667-05
I
MD
vs. R
APCSET
10Ω LOAD
0.8
0.7
0.6
I
MD
(mA)
0.5
0.4
0.3
0.2
0.1
0
APC LOOP CLOSED
R
BIASSET
= 2kΩ
R
MODSET
= 2kΩ
MONITOR-TO-LASER
CURRENT GAIN = 82
MAX3667-06
180
160
140
V
IBIAS
= 1.7V
10Ω LOAD
160
140
120
I
QMOD
(mA)
100
80
60
40
20
0
0.9
120
I
BIAS
(mA)
100
80
60
40
20
0
200
1k
R
BIASSET
(Ω)
10k
40k
200
1k
R
MODSET
(Ω)
10k
40k
1k
R
APCSET
(Ω)
10k
40k
I
BIAS
vs. R
APCSET
(VARYING MONITOR-TO-LASER
CURRENT GAIN)
MAX3667-07
PULSE-WIDTH DISTORTION
vs. TEMPERATURE
I
MOD
= 30mA
PULSE-WIDTH DISTORTION (ps)
100
80
V
CC
= +3.3V
60
40
20
0
V
CC
= +5.0V
MAX3667toc08
PULSE-WIDTH DISTORTION
vs. I
MOD
MAX3667toc09
80
70
60
50
I
BIAS
(mA)
40
30
20
10
0
1k
R
APCSET
(Ω)
10k
GAIN = 30
GAIN = 60
GAIN = 90
120
120
100
80
V
CC
= +3.3V
60
40
20
0
V
CC
= +5.0V
GAIN = 15
PULSE-WIDTH DISTORTION (ps)
40k
-40
-15
10
35
60
85
10 15 20 25 30 35 40 45 50 55 60
I
MOD
(mA)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
Typical Operating Characteristics (continued)
(T
A
= +25°C, V
CC
= +3.3V, unless otherwise noted.)
APC BANDWIDTH vs. C
COMP
(VARYING MONITOR-TO-LASER
CURRENT GAIN)
MAX3667-10
MAX3667
SUPPLY CURRENT vs. TEMPERATURE
150
140
EXCLUDING I
BIAS
R
MODSET
= R
BIASSET
= 2kΩ
10Ω LOAD
V
CC
= +5.0V
MAX3667-11
100M
10M
APC BANDWIDTH (Hz)
1M
MEASURED RESULTS
160
I
SUPPLY
(mA)
100k
10k
1k
100
10
1pF
GAIN = 30
GAIN = 90
GAIN = 60
130
120
110
100
V
CC
= +3.3V
SIMULATED
RESULTS
100pF
10nF
C
COMP
1µF
100µF
90
80
-40
-15
10
35
60
85
TEMPERATURE (°C)
Pin Description
PIN
1, 2, 23, 24
3, 6, 8, 13, 14,
15, 18, 20, 22
4
5
7
9, 26, 28, 31
10
11
12
16
17
19, 21
25
27
29
30
32
NAME
V
CC
GND
IN+
IN-
DISABLE
N.C.
MODSET
APC
BIASSET
IBIAS
PULLUP
IMOD
MD
APCSET
BIASMON
MODMON
COMP
Supply Voltage Input
Ground
Positive PECL-Compatible Input
Negative PECL-Compatible Input
Disable Input. High = disable, TTL-compatible input.
No Connection
Adjustment for Laser-Diode Modulation Current
Feedback Current for Closed-Loop Laser-Diode Bias Control
Open-Loop Adjustment for Laser-Diode Bias Current
Laser-Diode DC Bias Current
V
CC
Supply for Internal 31Ω Pullup Resistor
Laser-Diode Modulation Current
Input for PIN Monitor Diode Current
Closed-Loop Adjustment for Laser-Diode Bias Current
IBIAS Current Monitor (gain = 1/38 IBIAS). Open PNP collector; connect to ground if not used.
IMOD Current Monitor (gain = 1/33 I
QMOD
). Open PNP collector; connect to ground if not used.
External Compensation Capacitor for Closed-Loop Laser-Diode Bias Current Control Stability
5
FUNCTION
_______________________________________________________________________________________
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
