Four Channels Integrated Laser Diode Drive Control Operates From Singl

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Four Channels Integrated Laser Diode Drive Control Operates From Singl

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HRF-TX1000
Four Channels Integrated Laser Diode Drive Control Operates From Single Volt Power Supply IEEE 802.3 Compliant, XAUI Compatible Interface GBIC Compatible Single Point Failure Detection Application Specific Programmability, Including Modulation Current Modulation Current Temperature Coefficient Duty Cycle Control
Quad Programmable 10Gb/s Laser Diode Driver
Functional Block Diagram
Dummy Load Laser Diode Ferrite Bead Choke Monitor Photo Diode
device contains four separate channels
Electrical Interface
TX_DATP Current Range Control Pins TX_DATN (only pair Duty Cycle Correct
Window Comparator Fault(n) VAPCMAX VAPCMIN VAPCFB
Current Control
MODRNG0 MODRNG1
Modulation Current Control
Automatic Power Control Loop
VAPCREF
Rmdref
VAPCMAX
Single Channel
VAPCMIN
Channel Enable0 Channel Enable1 Channel Enable2 Channel Enable3
BandGap, Ibias, Soft Start, Shutdown
Modulation Current Temperature Coefficient
Duty Cycle Adjustment Control
Single Point Failure Protection
Bias Current Resistor (Only
VAPCMAX
VAPCMIN
Duty Cycle Correction (Only
Temp Coeff Control (Only
Product Description
Honeywell HRF-TX1000 designed IEEE 802.3 Gb/s Ethernet Fiber Optic applications using XAUI standard interface input. This quad, 3.125 Gb/s, fully integrated laser driver manufactured using Honeywell's patented Silicon Insulator (SOI) technology. HRF-TX1000 programmable bias control, modulation control, temperature compensation closed loop bias control, which enables compatibility with many laser diodes ensures optical-power stability over environmental conditions time. Each channel individually controlled. Soft start plug operations implemented. HRF-TX1000 operates from single positive Volt power supply provides high-level electronics integration minimize need external components.
Site: Email: 2001 TX1000 www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
Product Architecture
functional block diagram above shows four identical channels common control logic. Bandgap, Current Bias Generator, Duty Cycle Control, Temperature Coefficient Control, soft start blocks common channels, there also only reference current bias resistor duty cycle adjust, temp. coefficient select four channels. laser diode will always connected common-anode, monitor photo diode common-cathode. Peak peak amplitude modulation current controlled external digital (IMOD_POT) digital inputs (hardwired) MODRNG0 MODRNG1 which select corresponding modulation current range. There four ranges total IMOD_POT used select linear steps within range. temperature coefficient modulation current selected from range 1000ppm 6000ppm 1000ppm steps using IMOD_TC pot. bias current laser diode controlled IDC_POT RAPC resistor laser diode average optical power being maintained loop order account temperature variations aging laser diode itself. Note that each four separate channels tested independently disabling other three channels. This achieved setting their digital enable inputs low.
General Specifications
Symbol Temp (Tx) Ptotal Parameter Operating Temperature Supply Voltage Supply Current (Note Total Power Dissipation Conditions 2.97 3.63 Units
Note supply current specified through pins. Note total power dissipation includes supply current laser bias current.
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
Laser Modulation Specifications
Symbol TX_BPS TX_EDGE TX_DJ TX_RJ TX_TJ IMOD1_ ABS_MIN IMOD1_ ABS_MAX IMOD0 IMOD1_R1 IMOD1_R2 IMOD1_R3 IMOD1_R4 IMOD_OS VMOD_ CTRL TCMOD DUTYADJ DUTYTOL RPOT
Note Note Note Note
Parameter Bit-Rate Rise Fall Time, 20-80% Jitter (Deterministic) (Pk/Pk) (Note 3,4) Jitter (Random)(Pk/Pk) (Note Jitter (Total) (Pk/Pk) (Note Absolute Minimum Laser Modulation Current (Logic Absolute Maximum Laser Modulation Current (Logic Modulation Current (Logic Modulation Logic Current Range (Note Modulation Logic Current Range (Note Modulation Logic Current Range (Note Modulation Logic Current Range (Note Modulation Current Maximum Overshoot Control Voltage Used Modulation Current Step Appropriate Range. (Note Modulation Reference Voltage Temperature Coefficient (Note Extinction Ratio Frequency Cutoff (Electrical -3db) (Note Pulse Width Adjustment Range (Note Pulse Width Adjustment Range Tolerance Resistance (Per Pot)
Conditions
2.45
3.125
3.20
Units Gbit/s
VAPC 1000 +/-40 VAPCM 6000
+ppm/
kOhms
Peak-To-Peak Deterministic Jitter Tested With Repeated K28.5 Character /1100000101/0011111010/ 3.125 Gbit/S Jitter Specified Transmitter Only Does Include That Generated Laser Itself. Note Random Jitter Gaussian Distribution, Contributions Laser Diode Driver Random Jitter Added Rms. Modulation Current Step Size Increases With Increasing Range, However Resulting Optical Laser Diode Output Power Step Size Will Linear. Modulation Current (Peak-To-Peak) Determined Modulation Reference Voltage Modulation Current Range. Minimum VMOD_CTRL Will Produce Minimum IMOD Current Selected Range Conversely Maximum VMOD_CTRL Will Produce Maximum IMOD Current That Range. Each Range Having Total Number Steps Range With Linear Step Size. Separate IMOD_POT Potentiometer Used Program Each Channel, With Each Pre-Programmed Per-Part Per-Channel Basis Order Achieve Required Extinction Ratio Despite Part-To-Part Variations Laser Slope Efficiency. Laser Diode Driver Plays Part Programming This Resistor.
Note Note
Temperature Coefficient With Respect Silicon Junction Temperature Which Different From Laser Diode Junction Temperature. Ratio-Metric Temperature Coefficient Controlling Modulation Current Been Specified 20ppm Selection 8B/10B Coding Used Data Channels
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
Typical Modulation Current Values
Modulation Current Range IMODRNGO Setting IMODRNG1 Setting Minimum Maximum Units
Automatic Power Control Specifications
Symbol VDDAPC VAPCREF VAPCMAX VAPCMIN IMON_RN RAPC VAPCHYS TCBIAS IBIASMIN IBIASMAX CAPC IBOV
Note Note Note Note
Parameter Supply Voltage Over Which Block Functional Reference Voltage Range Automatic Power Control (Note Shutdown Threshold. Corresponds IAPCMIN (Upper Limit) Power-On Threshold. Corresponds IAPCMIN (Lower, Power Rising) Monitor Diode Absolute Current Range Reference Resistor Range, Defined IMON_RNG VAPCREF (Note Hysteresis VAPCMIN Temperature Coefficient Bias Reference Voltage Minimum Bias Current Generated Feedback Loop Maximum Bias Current Generated Feedback Loop Total Capacitance Monitor (Note Overshoot Bias Current Turn (Note12)
Conditions
2.80 VAPCMIN
3.63 VAPCMAX
Units
0.75 90.0
Kohms
VAPCMAX VAPCMIN Outputs Enable Maximum Dynamic Range Digital Output VAPCREF. Resistor Value Selected User Appropriate Laser/Monitor Diode Arrangement. This Capacitance Parasitics Required Order Ensure Stability Feed Back Loop. Extreme Corners, Such That IMOD=2ma IBIAS>55ma This Maximum Spec Exceeded. This Realistic Problem Since Modulation Currents IBIAS Lasing Threshold Current Will Less Than 55mA. bias current adjusted under feedback control such that time-averaged photo-current through monitor photodiode held constant. steady-state value this current determined reference voltage VAPCREF value external resistor RAPC. (IMON VAPCREF RAPC) Separate resistors IDC_POTs used each channel. RAPC resistor value selected suit laser/monitor diode arrangement used value VAPCREF inputs programmed per-part per-channel basis using external digital potentiometer. HRF-TX1000 plays part programming this reference level. assumed that VAPCMAX VAPCMIN refer time averaged maximum minimum levels possible, transient levels which exceed this range.
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
Laser Diode Monitor Photodiode Specifications
Symbol VTHT Parameter Lasing Threshold Current Lasing Threshold Voltage (Ith/T) Threshold Current Temperature Dependence Coefficient Laser Diode Slope Efficiency (Note (/T) Slope Efficiency Temperature Dependence Coefficient. Laser Diode Capacitance (Note Monitor Photo-Diode Capacitance Monitor Photodiode Responsivity Monitor Photodiode Responsivity (Note Conditions Units
ETALD ETALDT
0.005 1000
0.035
0.075 6000
-ppm/
CMON RMON .RMON
Note
0.015
0.045
0.15
These Parameters Required Simulating Transient Behaviour Automatic Power Control Feedback Loop. Requirement Meet Specifications Previous Section That Characteristics Laser Diode Within Specified Ranges. Range Encompass Variety Different Manufacturers Laser Diodes. Large Signal Model Optimized Against Small Signal Model Ith+5ma. Device Higher Results Lower 0.1pf. Sumitomo Mitsubishi Laser Diodes 1.4pf Includes Approx. Coupling Losses Laser Diode Back Facet Power. Correlation .RMON ETALD Such That Worst Cases Cannot Occur Simultaneously Still Meet IMON_RNG Minimum Value.
Note
Note
Control Interface Timing Specifications
Symbol
T_OFF T_ON T_FAULT T_RESET VPON T_INIT TLO_INH
Parameter
TX_DISABLE Assert Delay TX_DISABLE Negate Delay TX_FAULT Assert Delay TX_DISABLE Pulse Width Reset Fault Power Detect Threshold (Notes Delay Between Power Detect TX_FAULT Clear Inhibit Laser Power Fault Condition After Power
Conditions
Units
(TBR) (3.3V) (TBR)
Note Note
laser driver circuits enabled until exceeds power threshold VPON. Assumes bandgap tolerance After initial power-on detect, circuit latches into power-up state does detect subsequent under voltage conditions. practice slightly lower ensure power detect minimum supply voltage. During normal operation, fault condition occurs when, more channels, OVERPWR: voltage VAPCFB<0:3> exceeds VAPCMAX LOPWR: voltage VAPCFB<0:3> below VAPCMIN During power-on transient state, LOPWR fault condition inhibited time TLO_INH. OVERPWR faults still detected this state. fault state, laser drivers shutdown. From this state, DISABLE held high T_RESET then circuit goes power-on transient state.
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
Flow Diagram (TX_FAULT, Laser Enable)
INITIAL, TRAN, TRAN2,
VPON
VMOD VAPCMIN
NORMAL, Comp Error TX_DISABLE DISABLE,
VMOD VAPCMIN T_ON expired
TX_DISABLE
T_LO_INH expired
GOT_PULSE, FAULT, TX_DISABLE T_RESET expired FAULT_WAIT, TX_DISABLE TX_DISABLE
Timers: T_LO_INH starts entry TRAN T_RESET starts entry FAULT_WAIT T_ON starts entry TRAN2
State Diagram Illustrating Operation HRF-TX1000 Control Interface Shutdown Circuitry
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
Connection List
Type =Power/Gnd, =Input, =Output, logic TX_DAT corresponds bright laser diode. logic TX_DAT corresponds dark laser diode.
Name TX_DATP<0:3> TX_DATN<0:3> VAPCFB<0:3> VAPCREF<0:3> TX_FAULT TX_DISABLE TX_BIAS<0:3> TX_MOD<0:3> TX_DUMMY<0:3> VMOD_CTRL<0:3> VTC_CTRL MODRNG0 MODRNG1 RDUTY GND_LD<0:3> GND_TX<0:3> GND_BG GND_APC (x2) GND_MOD (x2) VCC_TX<0:4> VCC_BG VCC_APC (x2) VCC_MOD (x2) VCC_DRIVE (x4) RBIAS VAPCMAX VAPCMIN PONDELAY SPFDELAY CHANNEL_ENABLE (x4)
Type
Description Non-Inverting Input, Channels Inverting Input, Channels Monitor Photodiode Anode/RAPC Connection. Reference Input Level. Control Interface Fault Indicator Control Interface Disable Input Bias Current Output Laser High Speed Modulation Current Laser High Speed Modulation Current Dummy Output Modulation Reference Voltage, Channels Modulation Temperature Coefficient Control. Modulation Current Range Input Lsb. Modulation Current Range Input Msb. Duty Cycle Correction Laser Drivers Electrical Interface Grounds Bandgap Ibias Ground Ground Current Crtl Ground Electrical Interface Bandgap Ibias Ground Supply Current Crtl Supply Laser Drive Circuit Bias Current Resistor Loop Reference Voltage Loop Reference Voltage Connection External Capacitor 300ms Delay. Connection External Capacitor Delay. Channel Enable /Disable Logic Inputs.
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295
HRF-TX1000
External Components
Name Lbiaschoke<0:3> Lmodcouple<0:3> Dummyload<0:3> Dmodcouple<0:3> Lddecouple Cdelay1 Cdelay2 Duty_Pot Idc_Pot<0:3> Rapc<0:3> Imod_Pot<0:3> Cdec<0-4> Rbias Component Ferrite Bead Capacitor Resistor Capacitor Capacitor Capacitor Capacitor Potentiometer Potentiometer Resistor Potentiometer (+/-1%) Description Part Network Laser Diode Part Network Laser Diode Part Network Dummy Load Part Network Dummy Load Laser Diode Decoupling Required 300ms Delay Required Delay Required Duty Cycle Adjustment Digital Potentiometer Monitor Current Control Resistor Imon Current Feedback Digital Potentiometer Modulation Current Control (10k Resistance Pot) Power Supply De-Coupling External Bias Current Resistor
POT's have been specified with temp coefficient 300ppm/ ratio-metric temp coefficient 20ppm/
Typical Application Circuit
Call Honeywell details
Evaluation Circuit Board
Call Honeywell details
Ordering Information
Ordering Number Product
HRF-TX1000-B HRF-TX1000-T HRF-TX1000-E
Note Call Honeywell details
Delivered Form(18) Delivered Flip Chip Form(18) Engineering Evaluation Board
Honeywell reserves right make changes improve reliability, function design. Honeywell does assume liability arising application product circuit described herein; neither does convey license under patent rights rights others.
Site: Email: 2001 TX1000
www.mysoiservices.com mysoiservices@honeywell.com Published 2001 Page
Honeywell Solid State Electronics Center 12001 State Highway Plymouth, Minnesota 55441-4799 1-800-323-8295

Four Channels Integrated Laser Diode Drive Control Operates From Singl

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