MAX3850EGJ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX3850EGJ ,+3.3 V, 2.7 Gbps, DC-coupled laser driverApplications*Dice are designed to operate over this range, but are testedSDH/SONET Transmission Add ..
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MAX3850EGJ
+3.3 V, 2.7 Gbps, DC-coupled laser driver
General Description
The MAX3850 is a +3.3V DC-coupled laser driver for
SDH/SONET applications up to 2.7Gbps. The device
accepts differential data and clock inputs and provides
bias and modulation currents for driving a laser. If a
clock signal is available, a synchronizing input latch
can be used to reduce jitter. An automatic power-con-
trol (APC) feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range of 5mA to
60mA (up to 80mA AC-coupled) and bias current of
1mA to 100mA are easy to program, making this prod-
uct ideal for SDH/SONET applications. The MAX3850
also provides laser current-enable control, two current
monitors that are directly proportional to the laser bias
and modulation currents, and a failure-monitor output to
indicate when the APC loop is unable to maintain the
average optical power. Designed to be DC-coupled to
the laser with a supply voltage of only 3.3V, the
MAX3850 greatly simplifies interface requirements. The
MAX3850 is available in a small 32-pin QFN package
as well as dice.
Applications
FeaturesSingle +3.3V Power Supply35mA Supply CurrentProgrammable Bias Current from 1mA to 100mAProgrammable Modulation Current from 5mA to
60mA (Up to 80mA AC-Coupled)Bias Current and Modulation Current Monitors70ps Rise/Fall TimeAutomatic Average Power Control with Failure
MonitorComplies with ANSI, ITU, and Bellcore
SDH/SONET SpecificationsLaser Current-Enable Control
MAX3850
2.7Gbps, +3.3V DC-Coupled
Laser Driver
Ordering Informationypical Application Circuits
19-2294; Rev 1; 5/03
*Dice are designed to operate over this range, but are tested
and guaranteed at TA= +25°C only. Contact factory for
availability.
Covered by U.S. Patent numbers 5,802,089 and 5,883,910
Typical Application Circuits are continued at the end of the
data sheet.
Pin Configuration appears at the end of the data sheet.
SDH/SONET Transmission
Systems
MPLS Transmitter Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
MAX3850
2.7Gbps, +3.3V DC-Coupled Laser Driver
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, IMOD= 30mA, IBIAS= 60mA, TA= +25°C, unless
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, VCC..............................................-0.5V to +4.0V
Current into BIAS............................................-20mA to +150mA
Current into OUT+, OUT-................................-20mA to +100mA
Current into MD.....................................................-5mA to +5mA
Voltage at DATA+, DATA-, CLK+, CLK-, ENABLE, LATCH,
FAIL, BIASMON, MODMON, CAPC,
MODSET, BIASMAX, APCSET................-0.5V to (VCC+ 0.5V)
Voltage at APCFILT...............................................-0.5V to +3.0V
Voltage at OUT+, OUT-.............................................0.4V to 4.8V
Voltage at BIAS............................................1.0V to (VCC+ 0.5V)
Continuous Power Dissipation (TA= +85°C)
32-Pin QFN (derate 21.2mW/°C above +85°C)........13.84mW
Storage Temperature Range.............................-65°C to +165°C
Operating Junction Temperature Range...........-55°C to +150°C
Processing Temperature (die).........................................+400°C
Lead Temperature (soldering,10s)..................................+300°C
MAX3850
2.7Gbps, +3.3V DC-Coupled Laser Driver
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.0V to +3.6V, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, IMOD= 30mA, IBIAS= 60mA, TA= +25°C, unless
otherwise noted.) (Note 1)
AC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, IMOD= 5mA to 60mA, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, IMOD= 30mA, TA= +25°C.)
(Note 7)
Note 1:Dice are tested at TA= +25°C only. Specifications at -40°C are guaranteed by design and characterization.
Note 2:Tested at RMODSET= 2.61kΩ, RBIASMAX= 1.96kΩ, excluding IBIASand IMOD.
Note 3:Voltage on BIAS pin is (VCC- 1.5V).
Note 4:The bias and modulation currents will be switched off if any of the current set pins are grounded.
Note 5:Accuracy refers to part-to-part variation.
Note 6:Assuming the laser-to-monitor diode transfer function does not change with temperature. Guaranteed by design and
characterization.
Note 7:AC characteristics are guaranteed by design and characterization using the characterization circuit of Figure 2.
Note 8:Measured with repeating 0000 1111 pattern, LATCH = high.
MAX3850
2.7Gbps, +3.3V DC-Coupled Laser Driver
MAX3850
2.7Gbps, +3.3V DC-Coupled Laser Driver
BIAS CURRENT ENABLE
STARTUP DELAY vs. CAPC
MAX3850 toc02
CAPC (F)
STARTUP DELAY (ms)
0.1µ0.01µ1000p
100p1.0µ
ELECTRICAL EYE DIAGRAM
(IMOD = 25mA, 213 - 1 + 80 CID, 32 QFN)
MAX3850 toc03
58ps/div
ELECTRICAL EYE DIAGRAM
(IMOD = 60mA, 213 - 1 + 80 CID, 32 QFN)
MAX3850 toc04
58ps/div
ELECTRICAL EYE DIAGRAM
AC-COUPLED
(IMOD = 80mA, 213 - 1 + 80 CID, 32 QFN)
MAX3850 toc05
58ps/div
RANDOM JITTER vs. IMOD
MAX3850 toc06
IMOD (mA)
RANDOM JITTER (psms)403020
DETERMINISTIC JITTER vs. IMOD
MAX3850 toc07
IMOD (mA)
TOTAL JITTER (ps
P-P40302060
IBIASMAX vs. RBIASMAX
MAX3850 toc08
RBIASMAX (Ω)
IBIASMAX
(mA)
10k
100100k
IMOD vs. RMODSET
MAX3850 toc09
RMODSET (Ω)
MOD
(mA)
10k100k
Typical Operating Characteristics
(DC-coupled output, TA = +25°C, unless otherwise noted.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX3850EGJ	MAXIM	N/a	10000	avai	+3.3 V, 2.7 Gbps, DC-coupled laser driver