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; 4/01
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 Modulation Enable Control Protection
Features
MAX3935
Ordering Information
PART MAX3935EGJ TEMP. RANGE -40°C +85°C PIN-PACKAGE QFN-EP*
Applications
SONET OC-192 STM-64 Transmission Systems DWDM Metro Long Haul Transmitters Add/Drop Multiplexer
*Exposed Configuration appears data sheet
Typical Application Circuit
VBIASREF
-5.2V -5.2V BIASMON DATA+ DATA+ MODN1 DATA50 DATAMOD VOUT BIASSET
MAX3910
10Gbps SERIALIZER CLK+ CLK50
MAX3935
CLK+
MODN2
BIAS CLKPWC+ PWC- MODEN RTEN MODMON MODSET -5.2V -5.2V -5.2V
100pF
RPWC
-5.2V
FUTURE PRODUCT
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 .-55°C +150°C Storage Temperature Range .-55°C +150°C Lead Temperature (soldering, 10s) .+300°C
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, +3.3V, 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 -1.0 +0.075 -0.4 -0.15 +0.4 -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 Bias current 1mA, +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, +3.3V, 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 -1.8 -1.3 -0.8 -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, +3.3V, 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 -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, +3.3V, IBIAS 16.7mA, IMOD 83.3mA, +25°C, unless otherwise noted.) (Notes
PARAMETER Output Overshoot 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
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 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.
Typical Operating Characteristics
+25°C, unless otherwise noted.) OPTICAL DIAGRAM (IMOD 100mA, 213-1 +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
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
SUPPLY CURRENT (IEE) TEMPERATURE (EXCLUDES BIAS MODULATION CURRENTS)
MAX3935 toc04
MAX3935
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
PERCENT UNITS FALL-TIME (ps)
1200
1600
2000
0.05
0.10
0.15
0.20
0.25
0.30
RPWC+
VMODREF
BIAS VOLTAGE (50) LOAD VBIASREF
MAX3935 toc10
POWER-SUPPLY REJECTION RATIO FREQUENCY
83.3mA PSRR (dB) 0.01 1000 10000 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). Connection. Leave unconnected. Complementary Modulation Output with On-Chip Resistive Load. Connect GND. Modulation Output, DC-Coupled Bias Output. Connect inductor.
10.7Gbps Driver
Description (continued)
NAME BIASSET BIASMON MODEN RTEN FUNCTION Bias Current Set. Connected output external (see Design Procedure). 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
MAX3935
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 with 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 will degrade optical output performance. Since 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) voltage MODMON equal (IMOD RMOD) VEE. IBIAS IMOD shown Figure internal resistors RBIAS RMOD respectively (±10%). BIASMON MODMON should connected 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 75-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, synchronous differential clock signal should connected 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. Refer Modulation Voltage MODREF graph Typical Operating Characteristics select value VMODREF that corresponds required modulation current. IMOD MODREF
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 75-termination resistor. VBIAS IBIAS ZEAM 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. Refer Bias Voltage VBIASREF graph Typical Operating Characteristics select value VBIAS that corresponds required bias voltage.
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
10.7Gbps Driver MAX3935
RTEN
MODEN
CLK+ MODN1 MODN2 CLKQ DATA+ BIAS
DATAVTT
IMOD IBIAS
RMOD RBIAS
RPWC PWC+ PWC-
MODSET
BIASSET MODMON
BIASMON
Figure Functional Diagram
IBIAS BIASREF keep bias modulation currents compliance, following constraint total current must made modules: |VEE| (IBIAS IMOD) 1.55V
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 Refer Table desired effect pulse width setting.
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. Circuit boards should made using low-loss dielectrics. controlled-impedance lines clock data inputs well modulation output.
Input Output Schematics
DATA+
Configuration
BIASMON
DATA-
RTEN
BIAS
VIEW
MODEN
BIASSET
N.C.
DATA+ DATAVTT
Figure Equivalent Input Circuit
MODN1 MODN2
MODN1 MODN2
MAX3935
CLK+ CLKVTT
MODMON
MODSET
PWC+
PWC-
N.C.
CORNER GROUND PADS EXPOSED MUST SOLDERED SUPPLY GROUND CIRCUIT BOARD.
IMOD
NOTE: PROTECTION INCLUDED MOD, MODN1, MODN2.
Figure Equivalent Output Circuit
Chip Information
TRANSISTOR COUNT: 1535 SUBSTRATE: PROCESS: BIPOLAR SILICON GERMANIUM
10.7Gbps Driver
Package Information
QFN, 5x5x0.85.EPS
MAX3935
10.7Gbps Driver MAX3935
Package Information (continued)
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 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

10.7Gbps Driver MAX3935 designed drive electro-absorption modulat

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