10.7Gbps Driver MAX3935 designed drive electro-absorption modulat

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10.7Gbps Driver MAX3935 designed drive electro-absorption modulat

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19-4803; 5/03
10.7Gbps Driver
MAX3935 designed drive electro-absorption modulator (EAM) data rates 10.7Gbps. provides programmable output levels through externally adjustable bias modulation currents. This driver fabricated with Maxim's in-house second-generation SiGe process. MAX3935 accepts differential ground-referenced clock data-input signals. Inputs terminated with on-chip resistors. input-data retiming latch used reject input-patterndependent jitter clock signal available. driver modulate devices amplitudes 3.0VP-P when device impedance Typical (20% 80%) edge speeds 34ps. output on-chip resistor back termination. MAX3935 allows bias voltage 1.2V. MAX3935 also includes adjustable pulse-width control circuit precompensate asymmetrical characteristics. Single -5.2V Power Supply 110mA Supply Current 34ps Typical Rise/Fall Time 10.7Gbps (NRZ) Operation On-Chip Termination Resistors Programmable Modulation Voltage 3.0VP-P Programmable Bias Voltage 1.2V Adjustable Pulse-Width Control Selectable Data Retiming Latch
Features
MAX3935
Modulation Enable Control Protection
Ordering Information
PART MAX3935EGJ MAX3935E/D TEMP RANGE -40°C +85°C -40°C +85°C PINPACKAGE Dice** CODE G3255-I
Applications
SONET OC-192 STM-64 Transmission Systems DWDM Metro Long-Haul Transmitters Add/Drop Multiplexers
**Dice designed operate over this range, tested guaranteed +25°C only. Contact factory availability. latest package outline information, www.maxim-ic.com/packages. Configuration appears data sheet
Typical Application Circuit
VBIASREF
-5.2V -5.2V BIASMON DATA+ DATA+ MODN1 DATA50 DATAMOD VOUT BIASSET
MAX3952
10Gbps SERIALIZER CLK+ CLK50
MAX3935
CLK+
MODN2
BIAS CLKPWC+ PWC- MODEN RTEN MODMON MODSET -5.2V -5.2V -5.2V
100pF
RPWC
-5.2V
VMODREF -5.2V -5.2V
REPRESENTS CONTROLLED-IMPEDANCE TRANSMISSION LINE
Covered U.S. patent number 5,883,910.
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
10.7Gbps Driver MAX3935
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .-6.0V +0.5V VTT.(VEE 0.5V) +0.5V DATA+, DATA- CLK+, CLK- .(VTT 1.2V) lower (VTT 1.2V) +0.5V MODEN, RTEN, PWC+, PWC- .(VEE 0.5V) +0.5V MODSET BIASSET Voltage .(VEE 0.5V) (VEE 1.5V) BIAS Voltage .(VEE 1.0V) +0.5V MODN1 MODN2 Voltage .-0.5V +0.5V Operating Junction Temperature Range .-55°C +150°C Storage Temperature Range .-55°C +150°C Lead Temperature (soldering, 10s) .+300°C Current into DATA+, DATA-, CLK+, CLK(VTT 0V).-24mA +30.5mA Current into DATA+, DATA-, CLK+, CLK(VTT -1.3V) .-24mA +24mA
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VEE -4.9V -5.5V ±6%, -40°C +85°C. Typical values -5.2V, IBIAS 16.7mA, IMOD 83.3mA, +25°C, unless otherwise noted.) (Note
PARAMETER Power-Supply Voltage Power-Supply Current Single-Ended Input Resistance Bias Current-Setting Range Bias Current-Setting Error Bias Sensing Resistor Bias Current Temperature Stability Bias Off-Current MODEN RTEN Input High MODEN RTEN Input Power-Supply Rejection Ratio SIGNAL INPUT Single-Ended Input (DC-Coupled) Single-Ended Input (AC-Coupled) high high -1.00 0.075 -0.400 -0.15 0.400 -0.075 PSRR 10MHz, 100mVP-P (Note RBIAS IBIAS 40mA (Note IBIAS BIASSET (VEE 0.4V) IBIAS SYMBOL Excluding bias modulation current Input IBIAS defined Figure Bias current 40mA, +25°C -480 -200 0.05 CONDITIONS -5.5 -5.2 -4.9 +480 UNITS ppm/°C
10.7Gbps Driver
ELECTRICAL CHARACTERISTICS (continued)
(VEE -4.9V -5.5V ±6%, -40°C +85°C. Typical values -5.2V, IBIAS 16.7mA, IMOD 83.3mA, +25°C, unless otherwise noted.) (Note
PARAMETER Differential Input Swing (DC-Coupled) Differential Input Swing (AC-Coupled) SIGNAL INPUT -1.3V Input Common Mode Single-Ended Input Differential Input Swing VICM high -1.225 -1.800 -1.3 -0.800 -1.375 VP-P SYMBOL CONDITIONS UNITS VP-P VP-P
MAX3935
ELECTRICAL CHARACTERISTICS
(VEE -4.9V -5.5V ±6%, -40°C +85°C. Typical values -5.2V, IBIAS 16.7mA, IMOD 83.3mA, +25°C, unless otherwise noted.) (Notes
PARAMETER Input Data Rates Input Return Loss Modulation Current-Setting Range Modulation Current-Setting Error Modulation Sensing Resistor Modulation Current Temperature Stability Modulation Off-Current Output Back Termination Resistor Output Edge Speed Setup/Hold-Time Pulse-Width Adjustment Range Pulse-Width Stability Pulse-Width Control Input Range tSU, (Note Figure (Notes 10Gbps (Notes PWC+ PWC- open (Notes PWC+ PWC-6 RMOD IMOD 100mA (Note IMOD 20mA MODSET (VEE 0.4V) 63.8 75.0 RLIN IMOD SYMBOL (Note 15GHz (Notes IMOD defined Figure (Note +25°C (Note -550 -200 86.3 CONDITIONS 10.7 +550 UNITS Gbps ppm/°C
10.7Gbps Driver MAX3935
ELECTRICAL CHARACTERISTICS (continued)
(VEE -4.9V -5.5V ±6%, -40°C +85°C. Typical values -5.2V, IBIAS 16.7mA, IMOD 83.3mA, +25°C, unless otherwise noted.) (Notes
PARAMETER Output Overshoot/Undershoot Driver Random Jitter Driver Deterministic Jitter SYMBOL (Note (Note (Note CONDITIONS 0.75 UNITS psRMS psP-P
Note Note Note Note Note Note Note Note Note
Specifications -40°C guaranteed design characterization. Guaranteed design characterization. Measured using 10.7Gbps repeating 0000 0000 1111 1111 pattern. characterization performed using circuit Figure Measured using 10.7Gbps PRBS with eighty zeros eighty ones input data pattern. both data inputs (DATA+, DATA-) clock inputs (CLK+, CLK-). Load impedance parallel with internal termination. PSRR log10 (VNOISE VCC)/(IMOD 30)). Excludes effect external amp. 40mA IMOD 100mA.
Typical Operating Characteristics
+25°C, unless otherwise noted.) OPTICAL DIAGRAM (IMOD 100mA, +80CID)
MAX3935 toc01
ELECTRICAL DIAGRAM (IMOD 100mA, +80CID)
MAX3935 toc02
ELECTRICAL DIAGRAM (IMOD 20mA, +80CID)
MAX3935 toc03
14ps/div
13ps/div
13ps/div
10.7Gbps Driver MAX3935
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
SUPPLY CURRENT (IEE) TEMPERATURE (EXCLUDES BIAS MODULATION CURRENTS)
MAX3935 toc04
PULSE-WIDTH DISTORTION TEMPERATURE
MAX3935 toc05
TYPICAL DISTRIBUTION RISE TIME
PERCENT UNITS
MAX3935 toc06
SUPPLY CURRENT (mA) TEMPERATURE (°C)
20mA PULSE-WIDTH DISTORTION (ps) 100mA
TEMPERATURE (°C)
RISE TIME (ps)
PULSE WIDTH RPWC TYPICAL DISTRIBUTION FALL TIME
MAX3935 toc07
2000 PULSE WIDTH POSITIVE PULSE (ps)
1600
RPWC- 1200
MAX3935 toc08
MODULATION VOLTAGE VMODREF
PULSE WIDTH NEGATIVE PULSE (ps)
MAX3935 toc09
MODULATION VOLTAGE 0.05 0.10 0.15 0.20 0.25
PERCENT UNITS FALL TIME (ps)
1200
1600
2000
RPWC+
0.30
VMODREF
BIAS VOLTAGE (50) LOAD VBIASREF
MAX3935 toc10
POWER-SUPPLY REJECTION RATIO FREQUENCY
83.3mA PSRR (dB) 0.01 1000 10,000 20mA 100mA
MAX3935 toc11
BIAS VOLTAGE 0.05 0.10 0.15 VBIASREF 0.20 0.25
0.30
FREQUENCY (kHz)
10.7Gbps Driver MAX3935
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
DIFFERENTIAL FREQUENCY
MAX3935 toc12
FREQUENCY WITH POWER
MAX3935 toc13
|S11| (dB)
|S22| (dB)
FREQUENCY (GHz) FREQUENCY (GHz)
Description
NAME DATA+ DATAVTT CLK+ CLKPWC+ PWCGND MODMON MODSET N.C. MODN2, MODN1 BIAS FUNCTION Termination Reference Voltage Data Inputs Noninverting Data Input, with On-Chip Termination Inverting Data Input, with On-Chip Termination Termination Voltage Clock Inputs Noninverting Clock Input Data Retiming, with On-Chip Termination Inverting Clock Input Data Retiming, with On-Chip Termination Positive Input Modulation Pulse-Width Adjustment. Connected through RPWC. Negative Input Modulation Pulse-Width Adjustment. Connected through RPWC. Ground Negative Supply Voltage Modulation Current Monitor. (VMODMON VEE) IMOD. Modulation Current Set. Connected output external (see Design Procedure section). Connection. Leave unconnected. Complementary Modulation Output with On-Chip Resistive Load. Connect GND. Modulation Output, DC-Coupled Bias Output. Connect through inductor.
10.7Gbps Driver
Description (continued)
NAME BIASSET BIASMON MODEN RTEN FUNCTION Bias Current Set. Connected output external (see Design Procedure section). Bias Current Monitor. (VBIASMON VEE) IBIAS. TTL/CMOS Modulation Enable Input. normal operation, high absorption (logic state. Internal 100k pullup GND. TTL/CMOS Data Retiming Input. retimed data, high bypass retiming latch. Internal 100k pullup GND.
MAX3935
DATA+ DATA+ MODN1 DATA50 DATABIAS PATTERN GENERATOR OSCILLOSCOPE VOUT CLK+ CLK+ MODN2 CLK50 CLKRTEN -5.2V -5.2V MODEN -5.2V
MAX3935EGJ
Figure Characterization Circuit
Detailed Description
MAX3935 driver consists high-speed modulation driver EAM-biasing block (see Figure clock data inputs modulation driver interface with logic levels. modulation bias outputs sink current -5.2V. modulation output stage composed highspeed differential pair programmable current source rise times maximum modulation current 100mA. rise fall times typically 34ps. modulation current designed produce voltage 3.0VP-P when driving module.
3.0Vp-p results from 100mA through parallel with internal resistor (30). loading module with capacitance degrades optical output performance. Because BIAS output connected EAM, minimize parasitic capacitance associated with this using inductor isolate BIAS from EAM.
Clock/Data Input Logic Levels
MAX3935 directly compatible with reference CML. Other logic interfaces possible with AC-coupling capacitors. AC-coupled logic, other DC-coupled differential signals, common-mode input voltage.
10.7Gbps Driver MAX3935
(MODMON). voltage BIASMON equal (IBIAS RBIAS) VEE, voltage MODMON equal (IMOD RMOD) VEE. IBIAS IMOD shown Figure internal resistors RBIAS RMOD respectively (±10%). Connect BIASMON MODMON inverting input program bias modulation current (see Design Procedure).
CLK+ 0.15V 1.0V CLKtSU DATADATA+ 0.15V 1.0V
Design Procedure
Programming Modulation Voltage
modulation voltage results from IMOD passing through impedance parallel with internal termination resistor. VMOD IMOD ZEAM ZEAM
0.3V 2.0V (DATA+) (DATA-)
0.6V 3.0V VOUT
Figure Required Input Signal, Setup/Hold-Time Definition Output Polarity
Optional Input Data Retiming
eliminate pattern-dependent jitter input data, connect synchronous differential clock signal CLK+ CLK- inputs, RTEN control input should tied low. input data retimed rising edge CLK+. RTEN tied high left floating, retiming function disabled input data directly connected output stage. Leave CLK+ CLK- open when retiming disabled.
program desired modulation current, connect inverting input (see Typical Application Circuit) MODMON connect output MODSET. Connect positive voltage supply ground negative supply VEE. modulation current connecting reference voltage VMODREF noninverting input amp. Modulation Voltage MODREF graph Typical Operating Characteristics select value VMODREF that corresponds required modulation current. IMOD VMODREF
Pulse-Width Control
pulse-width control circuit used minimize pulse-width distortion. differential voltage between PWC+ PWC- adjusts pulse-width compensation. When PWC+ PWC- left open, pulsewidth control circuit automatically disabled.
Programming Bias Voltage
bias voltage results from BIAS passing through impedance parallel with internal termination resistor. VBIAS IBIAS ZEAM ZEAM
Modulation Output Enable
MAX3935 incorporates modulation current enable input. When MODEN low, modulation output (MOD) enabled. When MODEN high floating, output disabled. disabled condition, modulation output sinks current keep module high-absorption state. typical enable time 2ns, typical disable time 5ns.
Current Monitors
MAX3935 features bias-current monitor output (BIASMON) modulation-current monitor output
program desired bias current, connect inverting input (see Typical Application Circuit) BIASMON connect output BIASSET. Connect positive voltage supply ground negative supply bias current connecting reference voltage VBIASREF noninverting input amp. Bias Voltage BIASREF graph Typical Operating Characteristics select value VBIAS that corresponds required bias voltage.
10.7Gbps Driver MAX3935
RTEN
MODEN
CLK+ MOD2 CLKQ DATA+ BIAS MOD1 MODN2 MODN1
DATAVTT
IMOD IBIAS
RMOD RBIAS
RPWC PWC+ PWC-
MODSET
BIASSET MODMON
BIASMON
Figure MAX3935EGJ Functional Diagram
IBIAS
VBIASREF
high enough regulate power-supply ripple frequency VEE.
Pulse-Width Control Setup
methods control possible when pulse predistortion desired minimize distortion receiver. pulse width with potentiometer equivalent fixed resistors); applying voltage, with common mode, pins Table desired effect pulse-width setting.
keep bias modulation currents compliance, following constraint total current must made modules: |VEE| (IBIAS IMOD) 1.55V
External Selection
External amps required regulating bias modulation currents. ability operate from single supply with input common-mode range extending negative supply rail critical selection. bias current high PSRR also important. Bias current inverting input passes through resistor. This could error voltage produced modulation bias currentsense resistors. gain bandwidth must
Table Pulse-Width Control
PULSE WIDTH 100% >100% <100% Open VPWC+, VPWC- VPWC+ VPWC- VPWC+ VPWCVPWC+ VPWC-
10.7Gbps Driver MAX3935
Applications Information
Layout Considerations
minimize loss crosstalk, keep connections between MAX3935 output module short possible. good high-frequency layout techniques multilayer boards with uninterrupted ground plane minimize crosstalk. Make circuit boards using low-loss dielectrics. controlledimpedance lines clock data inputs well modulation output. Wire Bonding high-current density reliable operation, MAX3935 uses gold metalization. Make connections with gold wire only, using ball-bonding techniques. Wedge-bonding processes recommended possible fracturing sublayers caused stress during bonding. thickness mils (203µm). size mils mils (1.626mm 3.048mm). inductance high-speed connections MOD1, MOD2 MODN1, MODN2 must minimized. minimum length bond wires constrained type wire bonder used well dimensions die. Wire length measured plane from edge should approach mils possible. bond wire must come closer edge than bond wire diameter. MOD1 MOD2 should each have wire bond reduce total inductance output.
Input Output Schematics
DATA+
DATA-
Figure Equivalent Input Circuit
MODN1 MOD1 MOD2 MODN2
IMOD NOTE: PROTECTION INCLUDED MOD1, MOD2, MODN1, MODN2.
Figure Equivalent Output Circuit
10.7Gbps Driver
Configuration
BIASMON
MAX3935
Chip Topography
origin coordinates center die. locations referenced from origin indicate center where bond wire should connected. more information bonding coordinates refer Maxim Application Note HFAN08.0.1: Understanding Bonding Coordinates Physical Size Maxim's website.
RTEN
BIAS
VIEW
MODEN
BIASSET
N.C.
DATA+ DATAVTT
Chip Information
TRANSISTOR COUNT: 1535 SUBSTRATE: INSULATOR, CONNECT PROCESS: SiGe BIPOLAR THICKNESS: mils
MODN1 MODN2
MAX3935
CLK+ CLKVTT
MODMON
MODSET
PWC+
PWC-
EXPOSED MUST SOLDERED SUPPLY GROUND CIRCUIT BOARD.
N.C.
Chip Topography
N.C. N.C. RTEN MODEN BIASSET BIASMON BIAS
DATA+ DATAVTT
MODN1 MOD1
CLK+ CLKVTT
MOD2 MODN2
N.C. N.C.
PWC+ PWC-
N.C. N.C.
MODSET MODMON N.C.
10.7Gbps Driver MAX3935
Coordinates
NAME CLKCLK+ DATADATA+ N.C. N.C. RTEN MODEN BIASMON BIASSET BIAS COORDINATE -1393.5 -1393.5 -1393.5 -1393.5 -1393.5 -1393.5 -1393.5 -1393.5 -914.5 -788.5 -637.5 -511.5 -133.5 -7.5 118.5 348.5 474.5 703.5 829.5 955.5 1081.5 1207.5 1333.5 1393.5 -531 -392 -266 -140 MODN1 MOD1 MOD2 MODN2 N.C. MODSET MODMON N.C. N.C. PWCPWC+ N.C. N.C. NAME COORDINATE 1393.5 1393.5 1393.5 1393.5 1393.5 1393.5 1393.5 1333.5 1207.5 1081.5 955.5 829.5 703.5 474.5 348.5 118.5 -7.5 -133.5 -259.5 -385.5 -511.5 -637.5 -788.5 -914.5 -140 -266 -392 -531 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681 -681
10.7Gbps Driver
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.
MAX3935
QFN.EPS
10.7Gbps Driver MAX3935
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.
Maxim makes warranty, representation guarantee regarding suitability products particular purpose, does Maxim assume liability arising application product circuit specifically disclaims liability, including without limitation consequential incidental damages. "Typical" parameters vary different applications. operating parameters, including "typicals" must validated each customer application customer's technical experts. Maxim products designed, intended authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure Maxim product could create situation where personal injury death occur. Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2003 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
QFN.EPS

10.7Gbps Driver MAX3935 designed drive electro-absorption modulat

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