MAX3735AETG+T ,2.7Gbps, Low-Power SFP Laser DriversApplicationsMAX3735AETG+ -40°C to +85°C 24 Thin QFN-EP**Gigabit Ethernet SFP/SFF Transceiver Module ..
MAX3735EGG ,2.7Gbps, Low-Power SFP Laser DriversELECTRICAL CHARACTERISTICS(V = +2.97V to +3.63V, T = -40°C to +85°C. Typical values at V = +3.3V, I ..
MAX3736ETE+ ,3.2Gbps, Low-Power, Compact, SFP Laser DriverApplicationsMAX3736ETE -40°C to +85°C 16 Thin QFN-EP* MAX3736ETE+ -40°C to +85°C 16 Thin QFN-EP* Gi ..
MAX3736ETE+T ,3.2Gbps, Low-Power, Compact, SFP Laser DriverELECTRICAL CHARACTERISTICS(V = +2.97V to +3.63V, T = -40°C to +85°C. Typical values are at V = +3.3 ..
MAX3737ETJ ,Multirate Laser Driver with Extinction Ratio ControlApplicationsV 3 22 OUT+CCMultirate OC-3 to OC-48 FEC TransceiversIN+ 4 21 OUT+Gigabit Ethernet SFF/ ..
MAX3738ETG+ ,155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control
MAX7327AATG+ ,I²C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/OsApplications● Cell Phones ● NotebooksSelector Guide● SAN/NAS ● Satellite RadioOPEN-● Servers INTERR ..
MAX7327AATG+T ,I²C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Osfeatures 12 push-pull outputs and four configurable open-● +1.71V to +5.5V Operating Voltagedrain I ..
MAX7328AAP+ ,I²C Port Expanders with Eight I/O PortsApplications● RAIDMAX7328AWE -40°C to +125°C 16 Wide SO● ServersMAX7328AAP -40°C to +125°C 20 SSOP● ..
MAX7328AWE+ ,I²C Port Expanders with Eight I/O PortsFeatures2● 100kHz, 5.5V-Tolerant, I C-Compatible Serial The MAX7328/MAX7329 are 2-wire serial-inter ..
MAX732CPA ,+5V/Adjustable Step-Up Current-Mode DC-DC ConvertersELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless ..
MAX732CWE ,+12 V step-up current-mode PWM regulatorapplications information,
refer to AN-4.1, MAX732 E V Surface-Mount Evaluation
Board and Flash EE ..
MAX3735AETG+-MAX3735AETG+T
2.7Gbps, Low-Power SFP Laser Drivers
General DescriptionThe MAX3735/MAX3735A are +3.3V laser drivers for
SFP/SFF applications from 155Mbps up to 2.7Gbps.
The devices accept differential input data and provide
bias and modulation currents for driving a laser. DC-
coupling to the laser allows for multirate applications
and reduces the number of external components. The
MAX3735/MAX3735A are fully compliant with the SFP
MSA timing and the SFF-8472 transmit diagnostic
requirements.
An automatic power-control (APC) feedback loop is incor-
porated to maintain a constant average optical power
over temperature and lifetime. The wide modulation cur-
rent range of 10mA to 60mA (up to 85mA AC-coupled)
and bias current of 1mA to 100mA make this product
ideal for driving FP/DFB laser diodes in fiber-optic mod-
ules. The resistor range for the laser current settings is
optimized to interface with the DS1858 SFP controller IC.
The MAX3735/MAX3735A provide transmit-disable con-
trol, a single-point latched transmit-failure monitor out-
put, photocurrent monitoring, and bias-current
monitoring to indicate when the APC loop is unable to
maintain the average optical power. The MAX3735A
also features improved multirate operation.
The MAX3735/MAX3735A come in package and die
form, and operate over the extended temperature
range of -40°C to +85°C.
ApplicationsGigabit Ethernet SFP/SFF Transceiver Modules
1G/2G Fibre Channel SFP/SFF Transceiver
Modules
Multirate OC3 to OC48-FEC SFP/SFF Transceiver
Modules
FeaturesSFP Reference Design AvailableFully Compliant with SFP and SFF-8472 MSAsProgrammable Modulation Current from 10mA to
60mA (DC-Coupled)Programmable Modulation Current from 10mA to
85mA (AC-Coupled)Programmable Bias Current from 1mA to 100mAEdge Transition Times <51ps27mA (typ) Power-Supply CurrentMultirate 155Mbps to 2.7Gbps OperationAutomatic Average Power ControlOn-Chip Pullup Resistor for TX_DISABLE24-Pin 4mm ×4mm QFN package
MAX3735/MAX3735A
2.7Gbps, Low-Power SFP Laser Drivers
Ordering InformationIN+
0.1µF
GNDMODSETAPCSETAPCFILT2APCFILT1
SHUTDOWN
TX_FAULT
TX_DISABLE
BC_MONPC_MON
BIAS
OUT+
OUT+
OUT-
OPTIONAL SHUTDOWN
CIRCUITRY
VCC
IN-
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE
SERDES
MAX3735
MAX3735A
0.1µF
+3.3V
+3.3V
CMD
FERRITE BEAD
+3.3V
10Ω
RBC_MON
RPC_MON
15Ω0.01µF
DS1858/DS1859
CONTROLLERCAPC
M0N2
M0N3
MON1
+3.3V
Typical Application Circuit19-2529; Rev 2; 7/04
*Dice are designed to operate from -40°C to +85°C, but are
tested and guaranteed only at TA= +25°C.
**EP = Exposed pad.
+Denotes lead-free package.
PARTTEMP RANGEPIN-PACKAGE
MAX3735E/D-40°C to +85°CDice*
MAX3735ETG-40°C to +85°C24 Thin QFN-EP**
MAX3735EGG-40°C to +85°C24 QFN-EP**
MAX3735AETG-40°C to +85°C24 Thin QFN-EP**
MAX3735AETG+-40°C to +85°C24 Thin QFN-EP**
Pin Configuration appears at end of data sheet.
EVALUATION KIT
AVAILABLE
MAX3735/MAX3735A
2.7Gbps, Low-Power SFP Laser Drivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.97V to +3.63V, TA = -40°C to +85°C. Typical values at VCC= +3.3V, IBIAS= 20mA, IMOD= 30mA, TA = +25°C, unless
otherwise noted.) (Note 1)
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 +6.0V
Current into BIAS, OUT+, OUT-......................-20mA to +150mA
Current into MD.....................................................-5mA to +5mA
Voltage at IN+, IN-, TX_DISABLE, TX_FAULT,
SHUTDOWN...........................................-0.5V to (VCC+ 0.5V)
Voltage at BIAS, PC_MON, BC_MON,
MODSET, APCSET.................................-0.5V to (VCC+ 0.5V)
Voltage at OUT+, OUT-.............................+0.5V to (VCC+ 1.5V)
Voltage at APCFILT1, APCFILT2..............................-0.5V to +3V
Continuous Power Dissipation (TA = +85°C )
24-Lead Thin QFN (derate 20.8mW/°C
above +85°C).............................................................1354mW
24-Lead QFN (derate 20.8mW/°C
above +85°C).............................................................1354mW
Operating Ambient Temperature Range (TA)......-40°C to +85°C
Storage Ambient Temperature Range...............-55°C to +150°C
Die Attach Temperature...................................................+400°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
POWER SUPPLYPower-Supply CurrentICCExcludes the laser bias and modulation
currents (Note 2)2750mA
I/O SPECIFICATIONSDifferential Input VoltageVIDVID = (VIN+) - (VIN-), Figure 12002400mVP-P
Common-Mode Input Voltage0.6 × VCCV
Differential Input Resistance85100115Ω
TX_DISABLE Input Pullup
ResistanceRPULL4.77.410.0kΩ
VHIGH = VCC15TX_DISABLE Input CurrentVLOW = GND, VCC = 3.3V, RPULL = 7.4kΩ-450µA
TX_DISABLE Input High VoltageVIH2V
TX_DISABLE Input Low VoltageVIL0.8V
TX_FAULT Output High VoltageVOHIOH = 100µA sourcing (Note 3)2.4V
TX_FAULT Output Low VoltageVOLIOL = 1mA sinking (Note 3)0.4V
SHUTDOWN Output High VoltageVOHIOH = 100µA sourcingVCC - 0.4V
SHUTDOWN Output Low VoltageVOLIOL = 100µA sinking0.4V
BIAS GENERATORBias On-Current RangeIBIASCurrent into BIAS pin1100mA
Bias Off-CurrentIBIASOFFCurrent into BIAS pin during TX_FAULT or
TX_DISABLE100µA
Bias OvershootDuring SFP module hot plugging
(Notes 4, 5, 11)10%
External resistor to GND defines the voltage
gain, IBIAS = 1mA, RBC_MON = 69.28kΩ10.01213.5Bias-Current Monitor GainIBC_MON
IBIAS = 100mA, RBC_MON = 693.25Ω11.51313.5
mA/A
MAX3735-8+8Bias-Current Monitor Gain
Stability
1mA ≤ IBIAS ≤ 100mA
(Notes 4, 6)MAX3735A-6+6%
MAX3735/MAX3735A
2.7Gbps, Low-Power SFP Laser Drivers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +2.97V to +3.63V, TA = -40°C to +85°C. Typical values at VCC= +3.3V, IBIAS= 20mA, IMOD= 30mA, TA = +25°C, unless
otherwise noted.) (Note 1)
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
AUTOMATIC POWER-CONTROL LOOPMD Reverse Bias Voltage18µA ≤ IMD ≤ 1500µA1.6V
MD Average Current RangeIMDAverage current into MD pin181500µA
IBIAS = 1mA
(MAX3735)-880+880
IBIA S = 1m AM AX 3735A) -110+110Average Power-Setting StabilityAPC closed loop
(Notes 4, 7)
IBIA S = 100m A-650+650
ppm/°C
Average Power Setting AccuracyAPC Closed Loop
1mA ≤ IBIAS ≤ 100mA (Note 8)-16+16%
MAX37350.811.23External resistor to GND
defines the voltage gain;
IMD = 18µA, RPC_MON =
50kΩMAX3735A0.91.1MD-Current Monitor GainIPC_MON
IMD = 1.5mA, RPC_MON = 600Ω0.9511.05
A/A
MAX3735-10+10MD-Current Monitor Gain Stability18µA ≤ IMD ≤ 1500µA
(Notes 4, 6)MAX3735A-4+4%
LASER MODULATORCurrent into OUT+ pin; RL ≤ 15Ω, VOUT+,
VOUT- ≥ 0.6V (DC-coupled)1060
Modulation On-Current RangeIMOD
Current into OUT+ pin; RL ≤ 15Ω_, V OUT+,
VOUT- ≥ 2.0V (AC-coupled)1085
Modulation Off-CurrentIMODOFFCurrent into OUT+ pin during TX_FAULT or
TX_DISABLE100µA
IMOD = 10mA-480+480Modulation-Current Stability
(Note 4)IMOD = 60mA-255+255ppm/°C
Modulation-Current Absolute
Accuracy10mA ≤ IMOD ≤ 60mA (Note 8)-15+15%
Modulation-Current Rise TimetR20% to 80%, 10mA ≤ IMOD ≤ 60mA (Note 4)4265ps
Modulation-Current Fall TimetF20% to 80%, 10mA ≤ IMOD ≤ 60mA (Note 4)5080ps
10mA ≤ IMOD ≤ 60mA at 2.67Gbps
(Notes 4, 9, 10)1838
At 1.25Gbps (K28.5 pattern)11.5
At 622Mbps (Note 9)18
Deterministic Jitter
At 155Mbps (Note 9)40
Random JitterRJ10mA ≤ IMOD ≤ 60mA (Note 4)0.71.0psRMS
MAX3735/MAX3735A
2.7Gbps, Low-Power SFP Laser Drivers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +2.97V to +3.63V, TA = -40°C to +85°C. Typical values at VCC= +3.3V, IBIAS= 20mA, IMOD= 30mA, TA= +25°C, unless
otherwise noted.) (Note 1)
Note 1:Specifications at -40°C are guaranteed by design and characterization. Dice are tested at TA= +25°C only.
Note 2:Maximum value is specified at IMOD= 60mA, IBIAS= 100mA.
Note 3:TX_FAULT is an open-collector output and must be pulled up with a 4.7kΩto 10kΩresistor.
Note 4:Guaranteed by design and characterization.
Note 5:VCCturn-on time must be ≤0.8s, DC-coupled interface.
Note 6:Gain stability is defined by the digital diagnostic document (SFF-8472, rev. 9.0) over temperature and supply variation.
Note 7:Assuming that the laser diode to photodiode transfer function does not change with temperature.
Note 8:Accuracy refers to part-to-part variation.
Note 9:Deterministic jitter is measured using a 223- 1 PRBS or equivalent pattern.
Note 10:Broadband noise is filtered through the network as shown in Figure 3. One capacitor,
C < 0.47µF, and one 0603 ferrite bead or inductor can be added (optional). This supply voltage filtering reduces the hot-
plugging inrush current. The supply noise must be < 100mVP-Pup to 2MHz.
Note 11:CAPCvalues chosen as shown in Table 4 (MAX3735A).
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
SAFETY FEATURESExcessive Bias-Current
Comparator Threshold Range
TX_FAULT always occurs for VBC_MON ≥
1.38V, TX_FAULT never occurs for
VBC_MON ≤ 1.22V
1.221.301.39V
Excessive MD-Current
Comparator Threshold Range
TX_FAULT always occurs for VPC_MON ≥
1.38V, TX_FAULT never occurs for
VPC_MON ≤ 1.22V
1.221.301.39V
SFP TIMING REQUIREMENTSTX_DISABLE Assert Timet_off
Time from rising edge of TX_DISABLE to
IBIAS = IBIASOFF and IMOD = IMODOFF
(Note 4)
0.145µs
CAPC = 2.7nF,
MAX3735 (Note 4)1ms
TX_DISABLE Negate Timet_on
Time from falling edge
of TX_DISABLE to
IBIAS and IMOD at 95%
of steady state when
TX_FAULT = 0 before
reset
MAX3735A
(Note 11)600µs
TX_DISABLE Negate Time
During FAULT Recoveryt_onFAULT
Time from falling edge of TX_DISABLE to
IBIAS and IMOD at 95% of steady state when
TX_FAULT = 1 before reset (Note 4)200ms
TX_FAULT Reset Time or Power-
On Timet_initFrom power-on or negation of TX_FAULT
using TX_DISABLE (Note 4)60200ms
TX_FAULT Assert Timet_faultTime from fault to TX_FAULT on, CFAULT ≤
20pF, RFAULT = 4.7kΩ (Note 4)3.350µs
TX_DISABLE to ResetTime TX_DISABLE must be held high to
reset TX_FAULT (Note 4)5µs
MAX3735/MAX3735A
2.7Gbps, Low-Power SFP Laser DriversVIN+
(VIN+) - (VIN-)
VIN-
(200mVP-P min,
2400mVP-P max)
(100mV min,
1200mV max)
IMOD
VOLTAGE
CURRENT
TIME
IOUT+
Figure 2. Output Termination for Characterization
50Ω75Ω
30Ω
30Ω
0.5pF
30Ω
OSCILLOSCOPE
OUT+
IOUT+
OUT-
OUT+
MAX3735
MAX3735A
VCCVCC
Figure 1. Required Input Signal and Output Polarity
SOURCE
NOISE
TO LASER
DRIVER VCCOPTIONAL
OPTIONAL
MODULEHOST BOARD
0.1µF
10µF
0.1µF
1µH
VOLTAGE
SUPPLY
FILTER DEFINED BY SFP MSA
Figure 3. Supply Filter
