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MAX3669ETG+T

P1-P3P4-P6P7-P9P10-P12P13-P13
General Description
The MAX3669 is a complete, +3.3V laser driver with auto-
matic power control (APC) circuitry for SDH/SONET appli-
cations up to 622Mbps. It accepts differential PECL
inputs, provides bias and modulation currents, and oper-
ates over a temperature range from -40°C to +85°C.
An APC feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range from 5mA to
75mA and bias current of 1mA to 80mA are easy to
program, making this product ideal for use in various
SDH/SONET applications. Two pins are provided to
monitor the current levels in the laser: BIASMON with
current proportional to laser bias current, and MODMON
with current proportional to laser modulation.
The MAX3669 also provides enable control and a failure-
monitor output to indicate when the APC loop is unable
to maintain the average optical power. The MAX3669
is available in 4mm x 4mm 24-pin thin QFN and
5mm x 5mm 32-pin TQFP packages.
Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Regenerators
Features
♦♦
+3.3V or +5.0V Single-Supply Operation
♦♦
40mA Supply Current at +3.3V
♦♦
Programmable Bias Current from 1mA to 80mA
♦♦
Programmable Modulation Current from
5mA to 75mA
♦♦
Bias Current and Modulation Current Monitors
♦♦
200ps Rise/Fall Time
♦♦
Automatic Average Power Control with Failure
Monitor
♦♦
Complies with ANSI, ITU, and Bellcore
SONET/SDH Specifications
♦♦
Enable Control
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
MAX3669
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
EVALUATION KIT AVAILABLE
DATA+
BIASMAX
MODSET
APCSET
CAPC
FAIL
ENABLE
GND
MD
BIAS
BIASMON
MODMON
OUT+
0.1μF
LASER
OUT-
C
MD
100pF
R
FILT
20Ω
C
FILT
5pF
C
D
1μF
R+
20Ω
R-
6.3Ω
R
D
5Ω
FERRITE
BEAD
V
CC
DATA-
PECL
+3.3V
+3.3V
+3.3V
84.5Ω
84.5Ω
124Ω
124Ω
4:1
SERIALIZER
WITH
CLOCK GEN
MAX3693
MAX3669
Typical Application Circuit
19-1575; Rev 6; 1/13
Ordering Information
Pin Configurations appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX3669ETG -40°C to +85°C 24 TQFN-EP*
MAX3669ETG+ -40°C to +85°C 24 TQFN-EP*
MAX3669EHJ -40°C to +85°C 32 TQFP
MAX3669EHJ+ -40°C to +85°C 32 TQFP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
2 Maxim Integrated
MAX3669
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.14V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°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.
Supply Voltage, V
CC
.............................................-0.5V to +7.0V
Current into BIAS ............................................-20mA to +150mA
Current into OUT+, OUT- ............................... -20mA to +100mA
Current into MD....................................................-5mA to +5mA
Voltage at DATA+, DATA-, ENABLE,
FAIL, BIASMON, MODMON..................-0.5V to (V
CC
+ 0.5V)
Voltage at OUT+, OUT-.............................+1.5V to (V
CC
+ 1.5V)
Voltage at MODSET, APCSET, BIASMAX, CAPC... -0.5V to +3.0V
Voltage at BIAS .........................................+1.0V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +85°C)
TQFN (derate 20.8mW/°C above +85°C) .................1354mW
TQFP (derate 14.3mW/°C above +85°C)....................929mW
Operating Junction Temperature Range...........-55°C to +150°C
Storage Temperature Range ............................ -65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
MODMON to I
MOD
Gain A
MOD
29 mA/mAI
MOD
/I
MODMON
BIASMON to I
BIAS
Gain A
BIAS
38 mA/mAI
BIAS
/I
BIASMON
35I
MD
= 18µA (Note 4)
I
MD
= 1mA
815I
BIAS
= 1mA
I
BIAS
= 80mA
PARAMETER SYMBOL MIN TYP MAX UNITS
Common-Mode Input Voltage V
ICM
V
CC
-V
CC
-V
CC
-
1.49 1.32 V
ID
/4
V
Differential Input Voltage V
ID
200 1600 mV
P-P
Bias Current Absolute Accuracy -15 +15 %
Bias Current Stability
255
ppm/°C
DATA+, DATA- Input Current I
IN
-1 +10 µA
Monitor Diode Current Stability
-480 -50 +480
ppm/°C
Monitor Diode Current
Absolute Accuracy
-15 +15 %
DC Monitor Diode Current I
MD
18 1000 µA
Bias Current Range
Supply Current 40 60 mA
I
BIAS
180mA
Bias Off Current 100 µA
Monitor Diode Input Voltage
(MD Pin)
V
MD
0.8 V
TTL Input High Voltage V
IH
2 V
TTL Input Low Voltage V
IL
0.8 V
TTL Output High Voltage (FAIL)
V
OH
2.4 V
CC
- 0.3 V
CC
V
TTL Output Low Voltage (FAIL)
V
OL
0.1 0.44 V
CONDITIONS
PECL compatible
Figure 1
APC open loop
APC open loop
(Note 3)
Sourcing 50µA
Sinking 100µA
(Note 1)
V
BIAS
= V
CC
- 1.6V
ENABLE = low (Note 2)
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.14V to +5.5V, load as shown in Figure 2, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V,
T
A
= +25°C.) (Note 5)
Maxim Integrated 3
MAX3669
Note 1: Tested with R
MODSET
= 5.11kΩ (I
MOD
≈ 38mA), R
BIASMAX
= 4.56kΩ (I
BIAS
≈ 52mA), excluding I
BIAS
and I
MOD
.
Note 2: Both the bias and modulation currents will be disabled if any of the current set pins are shorted to ground.
Note 3: Guaranteed by design and characterization. This assumes that the laser to monitor diode transfer function does not change
with temperature.
Note 4: See the
Typical Operating Characteristics
for worst-case distributions.
Note 5: AC characteristics are guaranteed by design and characterization.
Note 6: Total I
MOD
out of OUT+. See the
Design Procedure
section for information regarding current delivered to the laser.
Note 7: Input signal is a 622Mbps, 2
13
- 1 PRBS with eighty inserted 0s.
Note 8: Input signal is a 622Mbps, 11110000 pattern.
Note 9: PWD = (wider pulse – narrower pulse) / 2.
DATA+
DATA-
(DATA+) - (DATA-)
I
OUT
+
100mV MIN
800mV MAX
200mV
P-P
MIN
1600mV
P-P
MAX
I
MOD
Figure 1. Required Input Signal and Output Polarity
V
CC
15Ω
10Ω
1μF
1μF
12.4Ω
20Ω
OUT-
OUT+
BIAS
20Ω
50Ω
OSCILLOSCOPE
MAX3669
V
CC
I
OUT+
Figure 2. Output Termination for Characterization
10 135I
MOD
= 75mA
Maximum Consecutive Identical
Digits at 622Mbps
CID 80 Bits
I
MOD
= 5mA
I
MOD
= 75mA
Jitter Generation (Peak-to-Peak) 100 ps(Note 7)
205I
MOD
= 5mA (Note 4)
I
MOD
= 5mA
(Notes 8, 9)
PARAMETER SYMBOL MIN TYP MAX UNITS
230 375
psOutput Rise/Fall Time t
R,
t
F
100 200
Modulation Current Absolute
Accuracy
-15 +15 %
Pulse-Width Distortion
(Peak-to-Peak)
70 155
ps
Enable/Start-Up Delay 250 ns
Modulation Current Stability
-620 -165 +620
ppm/°C
CONDITIONS
20% to 80%,
R
L
= 10Ω
||
20Ω load
Open loop
I
MOD
= 75mA
Modulation Current Range I
MOD
575mA(Note 6)
Modulation Off-Current 200 µAENABLE = low (Note 2)
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX3669ETG+T

Mfr. #:
Buy MAX3669ETG+T
Manufacturer:
Maxim Integrated
Description:
Laser Drivers 3.3V 622Mbps SDH/SONET
Lifecycle:
New from this manufacturer.
Delivery:
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