MAX3656ETG+T ,155Mbps to 2.5Gbps Burst-Mode Laser DriverApplicationsFiber-to-the-Home (FTTH) and Fiber-to-the- +3.3VBusiness (FTTB) Broadband Access System ..
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MAX365CPE ,Precision, Quad, SPST Analog SwitchesGeneral Description ________
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MAX7310AEE ,2-Wire-Interfaced 8-Bit I/O Port Expander with ResetELECTRICAL CHARACTERISTICS(V+ = 2.3V to 5.5V, GND = 0, RESET = V+, T = -40°C to +125°C, unless othe ..
MAX7310ATE ,2-Wire-Interfaced 8-Bit I/O Port Expander with ResetMAX731019-2698; Rev 3; 2/052-Wire-Interfaced 8-Bit I/O Port Expanderwith Reset
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MAX3656ETG+-MAX3656ETG+T-MAX3656ETG-T
155Mbps to 2.5Gbps Burst-Mode Laser Driver
General DescriptionThe MAX3656 is a burst-mode laser driver that oper-
ates at data rates from 155Mbps up to 2.5Gbps. The
laser driver accepts either positive-referenced emitter-
coupled logic (PECL) or current-mode logic (CML) data
inputs and provides bias and modulation current for the
laser diode. The device can switch the laser diode from
a completely dark (off) condition to a full (on) condition
(with proper bias and modulation currents) in less than
2ns. The MAX3656 incorporates DC-coupling between
laser driver and laser diode and operates with a single-
supply voltage as low as +3.0V.
A digital automatic power-control (APC) loop is provided
to maintain the average optical power over the full tem-
perature range and lifetime. The APC loop is functional
for a minimum burst on-time of 576ns and minimum
burst off-time of 96ns, with no limit on the maximum
burst on- or off-time. A fail monitor is provided to indi-
cate when the APC loop can no longer maintain the
average power. The MAX3656 can be configured for
nonburst-mode applications (continuous mode) by con-
necting burst enable (BEN) high. For power saving, the
MAX3656 provides enabling and disabling functionality.
The modulation current can be set from 10mA to 85mA
and the bias current can be set from 1mA to 70mA.
The MAX3656 is packaged in a small, 24-pin, 4mm ✕
4mm thin QFN package and consumes only 132mW
(typ), excluding bias and modulation currents.
ApplicationsFiber-to-the-Home (FTTH) and Fiber-to-the-
Business (FTTB) Broadband Access Systems
Passive Optical Network (PON) Transmitters
APON, EPON, and GPON Upstream Transmitters
FeaturesMultirate Operation from 155Mbps to 2.5GbpsBurst Enable/Disable Delay <2nsBurst On-Time of 576ns to InfinityInfinite Bias-Current Hold Time Between BurstsDC-Coupled Operation with Single +3.3V Power
Supply40mA Typical Supply CurrentProgrammable Bias Current from 1mA to 70mAProgrammable Modulation Current from 10mA
to 85mAAutomatic Average Power Control with Failure
Monitor (No CAPCCapacitor Needed)APC Loop Initialization ≤3 Bursts
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser DriverVCC1891011122021222324
IN+
*EP
IN-
VCC
BEN+
BEN-
THIN QFNGND
VCC
GND
LONGB
BIAS-
BIAS+
VCC
OUT+
OUT-
VCC
GNDMDV
BIASMAXMODSETAPCSET
TOP VIEW
*EXPOSED PAD IS CONNECTED TO GND
MAX3656
FAIL
Pin ConfigurationMAX3656GNDF
AIL
LONGB
APCSET
MODSET
BIASMAX
+3.3V
IN-
IN+SERIAL
DATA
SOURCE
130Ω130Ω
82Ω82Ω
+3.3V
BEN-
BEN+BURST
CONTROL
130Ω130Ω
82Ω82Ω
OUT-
+3.3V
10nH
75Ω
+3.3V
+3.3V
10Ω
15Ω
OUT+
5.6Ω
BIAS+
5.6Ω
BIAS-
10Ω
27pF
ypical Application Circuit19-2790; Rev 4; 9/10
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information
PARTTEMP RANGEPIN-PACKAGEMAX3656ETG-40°C to +85°C24 Thin QFN-EP*
MAX3656ETG+-40°C to +85°C24 Thin QFN-EP*
Functional Diagram appears at end of data sheet.
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
ABSOLUTE MAXIMUM RATINGSStresses 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+, BIAS-, OUT+, OUT-........-20mA to +150mA
Current into MD....................................................-5mA to +5mA
Current into FAIL...............................................-10mA to +10mA
Voltage at IN+, IN-, BEN+, BEN-, EN,
LONGB...................................................-0.5V to (VCC+ 0.5V)
Voltage at MODSET, APCSET, BIASMAX.............-0.5V to +3.0V
Voltage at OUT+, OUT-.............................+0.5V to (VCC+ 1.5V)
Voltage at BIAS+, BIAS-............................+0.5V to (VCC+ 0.5V)
Continuous Power Dissipation (TA= +85°C)
24-Lead Thin QFN
(derate 27.8mW/°C above +85°C).............................1805mW
Operating Ambient Temperature Range (TA)......-40°C to +85°C
Storage Ambient Temperature Range (TSTG)...-55°C to +150°C
Lead Temperature (soldering,10s)..................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Containing lead(Pb).....................................................+240°C
OPERATING CONDITIONS
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS Supply VoltageVCC3.03.33.6V
Supply Turn-On Time 10% to 90%0.00110ms
Ambient Temperature-40+85°C
Data Mark Density Average50%
Consecutive Identical DigitsCID80Bits
Data Rate1552500Mbps
Monitor Diode CapacitanceCMD For minimum burst on-time (Note 1)15pF
Laser-to-Monitor Diode GainALMDΔ ( m oni tor cur r ent) /Δ ( l aser cur r ent ( ab ove IT H ) ) N otes 2, 3) 0.0050.050A/A
Extinction Ratiore 10 log (P1/P0) (Note 3)8.212.0dB
Note 1:Larger MD capacitance increases the minimum burst on-time.
Note 2:Laser-to-monitor gain equals the laser slope efficiency multiplied by the photodiode responsivity multiplied by the losses due
to laser-to-monitor diode coupling (ALMD= ηLASER✕ρMONITORDIODE✕LLASER-TO-MONITORDIODE).
where L = laser-to-monitor diode coupling loss. ALMDcan also be calculated by:
where IMD, IMOD, and re(extinction ratio) are set externally.
Note 3:Operation outside this range degrades APC loop performance.ILMD
MOD×⎛⎜⎞⎟+⎜⎞⎟2IrI
ELECTRICAL CHARACTERISTICS(Typical values are at VCC= +3.3V, IBIAS= 20mA, IMOD= 25mA, extinction ratio = 10dB, and TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLY Power-Supply Current ICC (Note 1) 40 70 mA
INPUT SPECIFICATIONS Differential Input Voltage VIN, VBEN0.2 1.6 VP-P
Common-Mode Input Voltage VCMVCC -
1.49
VCC -
1.32
VCC -
VIN/4V
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
ELECTRICAL CHARACTERISTICS (continued)(Typical values are at VCC= +3.3V, IBIAS= 20mA, IMOD= 25mA, extinction ratio = 10dB, and TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSingle-Ended Input Voltage VBEN+,
VBEN- 0.8 V
EN Input High Voltage VIH 2.0 V
EN Input Low Voltage VIL 0.8 V
FAIL Output High Voltage VOH Sourcing 50μA, VCC = 3.0V 2.4 V
FAIL Output Low Voltage VOL Sinking 100μA, VCC = 3.6V 0.4 V
BIAS GENERATOR Bias-On Current Range IBIAS Voltage at BIAS pin 0.6V 1 70 mA
Bias-Off Current Range IBIAS-OFFEN = high or BEN = low, VBIAS 2.6V (Note 2) 5 100 μA
IBIAS = 70mA 148 Bias-Current Temperature
Stability APC open loop IBIAS = 15mA 98 ppm/°C
Bias-Current Absolute
Accuracy APC open-loop IBIAS > 20mA (Note 3) -15 +15 %
BIASMAX Current-Setting Range 15 70 mA
APC LOOP MD Reverse-Bias Voltage VMD With respect to VCC 1.6 V
IMD = 50μA -750 +750 MD Bias-Setting Stability
(Note 4) IMD = 1500μA -480 +480 ppm/°C
IMD = 50μA -25 +25 MD Bias-Setting Accuracy
(Note 3) IMD = 1500μA -15 +15 %
MD DC-Current Range IMD Average current into MD pin 50 1500 μA
Case 1 (Note 5) (LONGB = 0) 12
Case 2 (Note 6) (LONGB = 0) 2.12 APC Loop Initialization Time
(Note 4) tINIT
Case 3 (Note 7) (LONGB = 0) 1.60 1.92
μs
LASER MODULATOR Data rate 1.25Gbps 10 85 Modulation ON Current Range IMODData rate >1.25Gbps 10 60 mA
Modulation OFF Current IMOD-OFFEN = high or BEN = low, IN = low (Note 2) 16 150 μA
Modulation-Current Stability (Note 13) -480 +480 ppm/°C
Modulation-Current Absolute
Accuracy IMOD > 15mA (Note 3) -15 +15 %
10mA IMOD < 60mA 0.6 Instantaneous Voltage at
Modulator Output (OUT+) 60mA IMOD 85mA 0.75 V
Modulation-Current Rise Time tR 10mA IMOD 85mA (Notes 8, 13) 40 85 ps
Modulation-Current Fall Time tF10mA IMOD 85mA (Notes 8, 13) 40 85 ps
Output Over-/Undershoot 20 %
155Mbps to 1.25Gbps, 10mA IMOD 85mA 17 45 Deterministic Jitter
(Notes 9, 13) DJ 1.25Gbps to 2.5Gbps, 10mA IMOD 60mA 17 40 psP-P
Random Jitter RJ (Note 13) 0.8 1.4 psRMS
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
ELECTRICAL CHARACTERISTICS (continued)(Typical values are at VCC= +3.3V, IBIAS= 20mA, IMOD= 25mA, extinction ratio = 10dB, and TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
BURST-MODE SPECIFICATIONS Burst Enable Delay APC closed loop (Notes 10, 11, 13) 2.3 ns
Burst Disable Delay APC closed loop (Notes 10, 12, 13) 2.0 ns
155Mbps 2881
622Mbps 720 Burst On-Time (Note 13) tB-ON
1.25Gbps, 2.5Gbps 576
ns
155Mbps 192
622Mbps 96 Burst Off-Time (Note 13) tB-OFF
1.25Gbps, 2.5Gbps 96
ns
OPTICAL EVALUATION 155.52Mbps 45
622.08Mbps 40
1.24416Gbps 31
Optical Eye Diagram Mask
Margin
ExceLight
SLT2886-LR
laser diode
(or equivalent) 2.48832Gbps 24
Note 1:Excludes IBIASand IMOD. Maximum value is specified at IMOD= 85mA, IBIAS= 70mA, and IMD= 1.5mA.
Note 2:For safety purposes, both the bias and modulation currents are switched off if any of the current set pins (BIASMAX, MODSET)
are grounded.
Note 3:Accuracy refers to part-to-part variation.
Note 4:APC loop initialization definitions:
IBIASError:IBIAS- IBIASSET, where IBIAS= the actual bias current and IBIASSET =the level of bias current set by the RAPCSET
resistor.
Initialization Case 1: Continuous Mode Power-Up. In this case, EN= low, BEN = high, and then VCC is ramped up from
0V to ≥3.0V.
Initialization Case 2: Chip-Enable Reset.In this case, 3.0V ≤VCC≤3.6V, BEN = high, and then ENchanges from high to low.
Initialization Case 3: Burst-Mode Startup. In this case, 3.0V ≤VCC≤3.6V, EN= low, and then BEN changes from low to high.
Note 5:IBIASerror is less than 3.8mA (for an extinction ratio of 10dB and IMD= 1500µA) within 12µs from the time that VCC≥3.0V.
Note 6:IBIASerror is less than 3.8mA (for an extinction ratio of 10dB and IMD= 1500µA) within 2.1µs (typ) from the time that EN< 0.8V.
Note 7:IBIASerror must be less than 3.8mA (for an extinction ratio of 10dB and IMD= 1500µA) at or before the end of the third
burst following the transition of BEN from low to high. For the shortest burst on- and off-time (576ns and 96ns), this trans-
lates to 1.92µs from when BEN toggles from low to high for the first time after startup.
Note 8:Rise and fall times are measured as 20% to 80% of the output amplitude with a repeating 0000011111.
Note 9:Deterministic jitter is measured with a continuous data pattern (no bursting) of 27- 1 PRBS + 80 consecutive ones + 27- 1
PRBS + 80 consecutive zeros.
Note 10:Measured electrically with a resistive load matched to the laser driver output.
Note 11:Enable delay is measured between (1) the time at which the rising edge of the differential burst enable input signal reach-
es the midpoint of the voltage swing, and (2) the time at which the combined output currents (bias and modulation) reach
90% of the final level set by RAPCSET, RBIASMAX, and RMODSET(after all transients such as overshoot, ringing, etc., have
settled to within 10% of their final values). See Figure 1. Measurement done for 10mA ≤IMOD≤85mA and 4mA ≤IBIAS≤
70mA.
Note 12:Disable delay is measured between (1) the time at which the falling edge of the differential burst enable input signal reaches
the midpoint of the voltage swing, and (2) the time at which the combined output currents (bias and modulation) fall below
10% of the bias on current (after transients have settled). See Figure 1. Measurement done for 10mA ≤IMOD≤85mA and
4mA ≤IBIAS≤70mA.
Note 13:Guaranteed by design and characterization.
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser DriverFigure 1. Enable and Disable Delay Times
BEN+
BEN-
ENABLE DELAYDISABLE DELAY
BEN ±MIDPOINT
IFINAL × 110%
IFINAL
IFINAL × 90%
10% OF IBIAS
IBIAS
IMOD
Figure 2. Output Termination for Characterization
OUT-
OUT+
BIAS+
BIAS-
VCC
VCC
VCC
VCC
22.1Ω
49.9Ω
50Ω
22.1Ω
26.7Ω
50Ω121Ω
OSCILLOSCOPE
26.7Ω
35.7Ω
IMOD
IBIAS
MAX3656
Z0 = 50Ω
Z0 = 50Ω
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
OPTICAL EYE DIAGRAM
(155.52Mbps, 117MHz FILTER,
PATTERN = 223 - 1 PRBS)MAX3656 toc01
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 15dB
MASK MARGIN = 45%
OPTICAL EYE DIAGRAM
(622.08Mbps, 467MHz FILTER,
PATTERN = 223 - 1 PRBS)MAX3656 toc02
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 15dB
MASK MARGIN = 40%
OPTICAL EYE DIAGRAM
(1.24416Gbps, 933MHz FILTER,
PATTERN = 223 - 1 PRBS)MAX3656 toc03
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 12dB
MASK MARGIN = 31%
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
OPTICAL EYE DIAGRAM
(2.48832Gbps, 2.3GHz FILTER,
PATTERN = 223 - 1 PRBS)MAX3656 toc04
EXCELIGHT SLT2886-LR LASER
AVERAGE OPTICAL POWER = -6dBm
EXTINCTION RATIO = 10dB
MASK MARGIN = 24%
ELECTRICAL EYE DIAGRAM
(2.5Gbps, IMOD = 30mA,
PATTERN = PRBS 27 - 1 + 80 CID)MAX3656 toc05
100ps/div
SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDES IBIAS, IMOD, 15Ω LOAD)
MAX3656 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (mA)30402050607080
DETERMINISTIC JITTER vs. IMODMAX3656 toc07
IMOD (mA)
DETERMINISTIC
JITTER (ps
P-P
DATA RATE = 2.5Gbps
PATTERN = 27 - 1PRBS + 80 CID
VIN = 200mVP-P
DETERMINISTIC JITTER
vs. INPUT AMPLITUDE
MAX3656 toc08
INPUT AMPLITUDE (mVP-P)
DETERMINISTIC
JITTER (ps
P-P
IMOD = 30mA
PATTERN = 27 - 1PRBS + 80 CID
DATA RATE = 2.5Gbps
RANDOM JITTER vs. IMOD
MAX3656 toc09
IMOD (mA)
RANDOM JITTER (ps
RMS
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser Driver10,000
IMD vs. RAPCSET
MAX3656 toc10
RAPCSET (kΩ)
IMOD vs. RMODSET
MAX3656 toc11
RMODSET (kΩ)
IMOD
(mA)
IBIASMAX vs. RBIASMAX
MAX3656 toc12
RBIASMAX (kΩ)
IBIASMAX
(mA)
TIMING DIAGRAM, BURST ONMAX3656 toc13
500ps/div
VMOD+
VBIAS+
BURST-ENABLE
SIGNAL
TIMING DIAGRAM, BURST OFFMAX3656 toc14
1ns/div
VMOD+
VBIAS+
BURST-DISABLE
SIGNAL
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX3656
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
Pin Description
PINNAMEFUNCTION1, 4, 9,
15, 18, 21 VCC Power-Supply Voltage IN+ Noninverting Data Input with On-Chip Biasing IN- Inverting Data Input with On-Chip Biasing BEN+ Noninverting Burst-Enable Input with On-Chip Biasing BEN- Inverting Burst-Enable Input with On-Chip Biasing ENTTL/CMOS Enable Input. Low for normal operation. Pull high or leave unconnected to disable laser
bias and modulation currents.
8, 11, 19 GND Power-Supply Ground FAIL TTL/CMOS Failure Output. Indicates APC failure when low.
12 LONGB TTL/CMOS Long Burst (See the Setting the LONGB Input Pin Section)
13 BIAS- Inverting Laser Bias-Current Output. Connect through 10 resistor and switching diode to VCC.
14 BIAS+ Noninverting Laser Bias-Current Output. Bias current flows into this pin when BEN is high. Minimize
capacitance on this pin.
16 OUT+ Noninverting Laser Modulation-Current Output. Modulation current flows into this pin when BEN and IN
are high.
17 OUT- Inverting Laser Modulation-Current Output. Connect through 15 resistor and switching diode to laser
diode anode.
20 MD Monitor Diode Input. Connect this pin to the anode of the monitor diode. Leave unconnected for open-
loop operation. Minimize capacitance on this pin.
22 BIASMAX
Maximum Bias Current Set. A resistor connected from this pin to ground sets the maximum bias
current. The bias current cannot exceed this level. The APC loop controls the bias current up to the
level of the BIASMAX. For APC open-loop operation, this pin sets the laser bias current.
23 MODSET Modulation Current Set. A resistor connected from this pin to ground sets the desired modulation current.
24 APCSET Average Power Control Set. A resistor connected from this pin to ground sets the desired average
optical power. Connect a 50k resistor to ground for APC open-loop operation.
— EP Exposed Pad. Ground. This pad must be soldered to ground.
