MB85R256PFTN

MAX3863 MAXIM | Alldatasheet

Document overview

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Technical content

Features

♦ Single +3.3V Power Supply ♦ 58mA Power-Supply Current ♦ Up to 2.7Gbps (NRZ) Operation ♦ On-Chip Termination Resistors ♦ Automatic Power Control (APC) ♦ Compensation for Constant Extinction Ratio ♦ Programmable Modulation Current Up to 80mA ♦ Programmable Bias Current Up to 100mA ♦ 50ps Typical Rise/Fall Time ♦ Pulse-Width Adjustment Circuit ♦ Selectable Data-Retiming Latch ♦ Failure Detector ♦ Mark-Density Monitor ♦ Current Monitors ♦ ESD Protection MAX3863 2.7Gbps Laser Driver with Modulation Compensation RTEN EN BIASMAX MODSET MODCOMP VCC BIASMON

25 MODMON

THE EXPOSED PAD MUST BE SOLDERED TO GND ON THE CIRCUIT BOARD. BIAS VCC MOD MODN VCC MD VCC CLK- CLK+ VCC VCC DATA- DATA+ MAX3863 1VCC 24 MDMON TOP VIEW Pin Configuration

Ordering Information

19-2281; Rev 2; 5/03 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN- PACKAGE PKG CODE MAX3863EGJ - 40°C to + 85°C 32 QFN G3255-1 MAX3863E/D* - 40°C to + 85°C Dice — Covered by U.S. patent number 5,883,910. Other patents pending. *Dice are designed and guaranteed to operate from -40°C to +85°C, but are tested only at TA = +25°C

2.7Gbps Laser Driver with Modulation Compensation ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = +3.15V to +3.6V, T A = -40°C to +85°C. Typical values are at V CC = +3.3V, IBIAS = 50mA, IMOD = 40mA, TA = +25°C, unless otherwise noted.) (Notes 1, 9) 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 specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RTEN, EN, BIAS, MK+, MK-, PWC+, PWC- MODMON, BIASMON, MDMON, MODCOMP, APCFILT1, APCFILT2, BIASMAX, MODSET, CC + 0.5V Continuous Power Dissipation (T A = +85°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Current I CC (Note 2) 58 85 mA Power-Supply Noise Rejection PSNR f = 100kHz, 100mV P-P (Note 10) 40 dB Power-Supply Threshold Output enabled 2.8 V Single-Ended Input Resistance Input to V CC 40 50 60 Ω Bias-Current Setting Range 4 100 mA APC open loop, IBIAS = 100mA, TA = +25°C -15 +15Bias-Current Setting Error APC open loop, IBIAS = 4mA, TA = +25°C -20 +20 Bias Off-Current EN high 0.1 mA IBIAS to IBIASMON Ratio 34 40 46 mA/mA APC open loop, 10mA ≤ IBIAS ≤ 100mA (Note 3) -480 +480Bias-Current Temperature Stability APC open loop, 4mA ≤ IBIAS ≤ 100mA (Note 3) ±390 ppm/°C Modulation-Current Setting Range 7 80 mA Modulation-Current Setting Error APC open loop, 25 Ω load, TA = +25°C -15 +15 % Modulation Off-Current EN high 0.1 mA Modulation-Current Temperature Stability APC open loop (Note 3) -480 +480 ppm/°C IMOD to IMODMON Ratio 38 46 53 mA/mA Modulation Compensation Range K K = ∆IMODC/∆IBIAS 0 1.5 mA/mA MD Pin Voltage 1.75 V Monitor Photodiode Current Range IMD 30 2000 µA APC Loop Time Constant t APC (Notes 3, 4) 1 4 1000 µs APC Open Loop 4mA ≤ IBIAS ≤ 10mA (Note 3) ±390 mA VMDMON to IMD Ratio R MDMON = 4kΩ 0.8 1.0 1.2 mV/µA EN and RTEN Input High V IH 2.0 V EN and RTEN Input Low V IL 0.8 V FAIL Output High V OH Source 150µA 2.4 V FAIL Output Low V OL Sink 2mA 0.4 V

2.7Gbps Laser Driver with Modulation Compensation ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.15V to +3.6V, T A = -40°C to +85°C. Typical values are at V CC = +3.3V, IBIAS = 50mA, IMOD = 40mA, TA = +25°C, unless otherwise noted.) (Notes 1, 9) Note 1: Specifications at -40°C are guaranteed by design and characterization. Note 2: Excluding IBIAS, IMOD, IBIASMON, IMODMON, IFAIL, and IPWC. Input clock and data are AC-coupled. Note 3: Guaranteed by design and characterization. Note 4: An external capacitor at APCFILT1 and APCFILT2 is used to set the time constant. Note 5: For both data inputs DATA+, DATA- and clock inputs CLK+, CLK-. Note 6: Measured using a 2.7Gbps repeating 0000 0000 1111 1111 pattern. Note 7: For pulse width, PW = 100%: Rp = Rn = 500Ω (or open) or PWC+ = PWC- ≈ +0.5V. For PW > 100%: Rp > Rn or PWC+ > PWC-. For PW < 100%: Rp < Rn or PWC+ < PWC-. Note 8: Measured using a 213 - 1 PRBS with 80 zeros + 80 ones input data pattern or equivalent. Note 9: AC characterization performed using the circuit in Figure 1. Note 10: Power-Supply Noise Rejection (PSNR) = 20log10(VNOISE (on VCC)/∆VOUT). VOUT is the voltage across the 25Ω load when no input is applied. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS At high V CCSingle-Ended Input (DC-Coupled) V IS At low V C C - 1.0 V C C - 0.1 V At high VCC + 0.05 VCC + 0.4 Single-Ended Input (AC-Coupled) V IS At low V C C - 0.4 V C C - 0.05 V DC-coupled 0.2 2.0Differential Input Swing V ID AC-coupled 0.2 1.6 VP-P Input Data Rate NRZ (Note 3) 3.2 Gbps f ≤ 2.7GHz 17Input Return Loss RL IN (Notes 3, 5) 2.7GHz < f ≤ 4GHz 14 dB Turn-Off Delay from EN EN = high (Note 3) 1.0 µs Setup Time t SU Figure 2 (Note 3) 90 ps Hold Time t HD Figure 2 (Note 3) 90 ps Pulse-Width Adjustment Range Z L = 25Ω (Notes 3, 6) ±185 ±220 ps Pulse-Width Stability PWC+ and PWC- open (Notes 3, 6) ±18.5 ps Differential Pulse-Width Control Input Range For P WC + and P W C - ( N otes 3, 7) , V C M = 0.5V -1.0 1.0 V Differential Mark Density 0% to 100%, V MK+ - VMK- ±0.85 V Differential Mark-Density Voltage to Mark-Density Ratio 15.5 V/% Output Edge Speed t R, tF ZL = 25Ω (20% to 80%) (Notes 3, 6) 50 85 ps Output Overshoot δ ZL = 25Ω (Note 3) ±7% Random Jitter (Notes 3, 6) 0.8 1.3 ps RMS Data Rate = 2.7Gbps (Notes 3, 8) 8 40Deterministic Jitter Data Rate = 3.2Gbps (Notes 3, 8) 10 40 psP-P

2.7Gbps Laser Driver with Modulation Compensation Typical Operating Characteristics (TA = +25°C, unless otherwise noted. See Typical Operating Circuit.) ELECTRICAL EYE DIAGRAM (IMOD = 80mA, DATA RATE = 2.7Gbps, PATTERN 213 - 1 + 80CID) MAX3863 toc01a 52ps/div ELECTRICAL EYE DIAGRAM (IMOD = 80mA, DATA RATE = 3.2Gbps, PATTERN 213 - 1 + 80CID) MAX3863 toc01b 52ps/div ELECTRICAL EYE DIAGRAM (IMOD = 7mA, DATA RATE = 2.7Gbps, PATTERN 213 - 1 + 80CID) MAX3863 toc02a 52ps/div ELECTRICAL EYE DIAGRAM (IMOD = 7mA, DATA RATE = 3.2Gbps, PATTERN 213 - 1 + 80CID) MAX3863 toc02b 52ps/div OPTICAL EYE DIAGRAM (IMOD = 40mA, DATA RATE = 2.5Gbps, PATTERN 213 - 1 + 80CID) MAX3863 toc03a 58ps/div OPTICAL EYE DIAGRAM (IMOD = 40mA, DATA RATE = 3.2Gbps, PATTERN 213 - 1 + 80CID) MAX3863 toc03b 58ps/div SUPPLY CURRENT (ICC) vs.TEMPERATURE (EXCLUDES BIAS AND MODULATION CURRENTS) MAX3863 toc04 TEMPERATURE (°C) SUPPLY CURRENT (mA) 6040-20 0 20 -40 80 DETERMINISTIC JITTER vs. IMOD MAX3863 toc05 IMOD (mA) DETERMINISTIC JITTER (psP-P) 756515 25 35 45 55 58 5 3.2Gbps 2.7Gbps PULSE-WIDTH ADJUST vs. DIFFERENTIAL VPWC MAX3863 toc06 VPWC+ - VPWC- (V) PULSE-WIDTH ADJUST (ps) -200 -100 100 200 300 -300 -0.8 0.8

2.7Gbps Laser Driver with Modulation Compensation MODULATION CURRENT vs. MODULATION SET RESISTOR MAX3863 toc07 RMODSET (kΩ) IMOD (mA) 101 1000.1 100 MODULATION MONITOR VOLTAGE vs. MODULATION CURRENT MAX3863 toc08 IMOD (mA) VMODMON (mV) 65503520 100 120 140 160 180 200 58 0 1000 0.1 10 100 BIAS CURRENT vs. BIASMAX SET RESISTOR 100 MAX3863 toc09 RBIASMAX (kΩ) IBIAS (mA) 150 100 200 250 300 04 0 3010 20 50 60 70 80 90 100 BIAS MONITOR VOLTAGE vs. BIAS CURRENT MAX3863toc10 IBIAS (mA) VBIASMON (mV) 0.01 0.1 10 100 1000 MONITOR DIODE CURRENT vs. APCSET RESISTOR 0.1 MAX3863 toc11 RAPCSET (kΩ) IBIAS (mA) DIODE-CURRENT MONITOR VOLTAGE vs. MONITOR DIODE CURRENT MAX3863 toc12 IMD (mA) VMDMON (V) 2.01.51.00.5 0.5 1.0 1.5 2.0 2.5 3.0 02 . 5 COMPENSATION (K) vs. RMODCOMP MAX3863 toc13 RMODCOMP (kΩ) K (mA/mA) 1010.1 0.1 0.01 0.01 100 POWER-SUPPLY NOISE REJECTION vs. FREQUENCY MAX3863 toc14 FREQUENCY (kHz) PSNR (dB) 1000100101 100 120 0.1 10,000 SINGLE-ENDED S11 vs. FREQUENCY MAX3863 toc15 FREQUENCY (GHz) MAGNITUDE S11 (dB) 431 2 -35 -30 -25 -20 -15 -10 -40 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted. See Typical Operating Circuit.)

2.7Gbps Laser Driver with Modulation Compensation Pin Description PIN NAME FUNCTION 1, 4, 5, 8, 14, 19, 22, 27 VCC Positive Supply Voltage

2 DATA+ Data Input, with On-Chip Termination

3 DATA- Complementary Data Input, with On-Chip Termination

6 CLK+ Clock Input for Data Retiming, with On-Chip Termination

7 CLK- Complementary Clock Input for Data Retiming, with On-Chip Termination

9 APCSET Monitor Diode Current Set Point

10 APCFILT1 APC Loop Filter Capacitor. Short to ground to disable the correction loop through the monitor diode.

11 APCFILT2 APC Loop Filter Capacitor

12 PWC+ Input for Modulation Pulse-Width Adjustment. Connected to GND through R PWC. 13 PWC- Complementary Input for Modulation Pulse-Width Adjustment. Connected to GND through RPWC. 15 MK+ Voltage Proportional to the Mark Density. MK+ = MK- for 50% duty cycle.

16 MK- Voltage Inversely Proportional to the Mark Density

17 FAIL Alarm for Shorts on Current Set Pins and APC Loop Failure Conditions, Active Low

18 BIAS Laser Diode Bias Current Source (Sink Type) to Bias the Laser Diode. Connect to the laser with an inductor. 20 MOD Driver Output. AC-coupled to the laser diode. 21 MODN Complementary Driver Output. Connect to dummy load off-chip.

23 MD Monitor Diode Connection

24 MDMON Monitor for MD Current. Voltage developed across an external resistor from mirrored MD current. 25 MODMON Monitor for Modulation Current. Voltage developed from IMOD mirrored through an external resistor. 26 BIASMON Monitor for Bias Current. Voltage developed from I BIAS mirrored through an external resistor. 28 MODCOMP Couples the Bias Current to the Modulation Current. Mirrors IBIAS through an external resistor. Open for zero coupling.

29 MODSET External Resistor to Program I MODC (IMOD = IMODS + IMODC)

30 BIASMAX External Resistor to Program the Maximum I BIAS

31 EN Modulation and Bias Current Enable, Active Low. Current disabled when floating or high. 32 RTEN Data Retiming Enable Input, Active Low. Retiming disabled when floating or high.

and fall times are typically 50ps. age to increase and the MK- voltage to decrease. sates pulse-width distortion elsewhere in the system. (typ) gives ±185ps of pulse-width distortion. condition, bias and modulation currents are off. Figure 1. AC Characterization

placed between the APCFILT1 and APCFILT2 pins. This capacitor sets the time constant of the APC loop. mum value set by the BIASMAX pin. lize the APC loop. The typical capacitor value is 0.01µF. (TTL/CMOS) to indicate an APC loop tracking failure. bias current to maintain the desired monitor current. and modulation output are turned off and FAIL is active. monitor pins must be 2.1V for compliance. ciency (η) using the equations in Table 1. Figure 2. Required Input Signal, Setup/Hold-Time Definition and Output Polarity

the laser after its bias threshold current has changed. the current from the inductor flows to the bias input.

• V D—Diode bias point voltage (1.2V typ)
• R L—Diode bias point resistance (5 Ω typ)
• L—Diode lead inductance (1nH typ) D—Series matching resistor (20 Ω typ) The time constant associated with the output pullup inductor and the AC-coupling capacitor, impacts the pattern-dependent jitter. For this second-order network L P usually limits the low-frequency cutoff. The capacitor CD is selected so: Keep the peak voltage droop less than 3% of the peak- to-peak amplitude during the maximum CID period t. The required time constant: If τ = L P/25Ω, and t = 100UI = 40ns, then L P = 35µH. Place a good high-frequency inductor of 2µH on the transmission line to the laser. Then you can place a low-frequency inductor of 33µH at a convenient dis- tance from the driver output. Programming the Bias Current When the APC loop is enabled, the actual bias current is reduced from the maximum value to maintain constant current from the monitor diode. With closed-loop control, the bias current will be set by the transfer function of the monitor diode to laser diode current. For example, if the transfer function to the monitor diode is 10.0µA/mA, then setting I MD for 500µA results in I BIAS equal to 50mA. The bias current must be limited in case the APC loop becomes open. The bias current also needs a set point in case the APC control is not used. The BIASMAX pin sets the maximum bias current. The BIASMAX current is established by an internal current regulator, which main- tains the bandgap voltage of 1.2V across the external 28 1 .% = e t t τ τ CR R L RRDD L P DL ×+ > +() () V I RR VCC MOD DL− ×+ ≥2 18() . II K IMODS MOD BIAS=× − K II II MOD MOD BIAS BIAS II I BIAS TH MOD=+ 2 I P r rMOD AVG e e =× × + 2 1 1 η MAX3863 2.7Gbps Laser Driver with Modulation Compensation PARAMETER SYMBOL RELATION Average Power P AVG PAVG = (P0 + P1)/2 Extinction Ratio r e re = P1/P0 Optical Power of a 1 P 1 P1 = 2PAVGre/(re + 1) Optical Power of a Zero P 0 P0 = 2PAVG/(re + 1) Optical Amplitude P P-P PP-P = P1 - P 0 Laser Slope Efficiency ηη = PP-P/IMOD Modulation Current I MOD IMOD = PP-P/η Threshold Current I TH P0 at I ≥ ITH Bias Current I BIAS IBIAS ≥ ITH + IMOD /2 Laser to Monitor Transfer ρMON IMD/PAVG

Table 1. Optical Power Relations

APCSET current in the same manner as the BIASMAX pin. responds to the required current at +25°C. Figure 3. Functional Diagram

2.7Gbps Laser Driver with Modulation Compensation DATA+ DATA- CLK+ CLK- DATA+ DATA- MODN MOD BIAS RMODSET RMODCOMP RBIASMAX RAPCSET MD CLK+ PWC+ PWC- APCFILT1 APCFILT2 MODSET MODCOMP BIASMAX APCSET CLK- RTEN CAPC 0.01µF EN LP 50Ω 50Ω VCC VCC 0.1µF 0.1µF 50Ω 50Ω 25Ω 20Ω 1kΩ RMODMON 100Ω RMDMON 100Ω 25Ω VCCVCC RPWC VCC MAX3863 MAX3892 10Gbps SERIALIZER REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE LP RBIASMON 4kΩ 25Ω MDMON BIASMON MODMON Typical Operating Circuit TRANSISTOR COUNT: 1786 PROCESS: Bipolar DIE SIZE: 81mil × 81mil PACKAGE SIZE: 5mm ✕ 5mm

2.7Gbps Laser Driver with Modulation Compensation Chip Topography BP22 MDMON BP33 GND BP32 RTEN BP31 EN BP30 BIASMAX BP29 MODSET BP28 MODCOMP BP27 GND BP26 VCC BP25 BIASMON BP24 MODMON BP23 GND 81mil 81mil BP21 MD BP20 GND BP18 MODN BP17 MODN BP16 MOD BP15 MOD BP14 V CC BP13 BIAS BP19 VCC VCC BP34 DATA+ BP35 DATA- BP36 GND BP39 CLK+ BP42 CLK- BP43 VCC BP37 VCC BP38 VCC BP40 VCC BP44 VCC BP41 GND BP1 APCSET BP2 APCFILT1 BP3 PWC- BP6 MK+ BP9 MK- BP10 APCFILT2 BP4 PWC+ BP5 GND BP7 GND BP11 VCC BP8 BP12 FAIL

2.7Gbps Laser Driver with Modulation Compensation Pad Coordinates NAME PAD COORDINATES (µM) NAME PAD COORDINATES (µM) GND BP1 169, -122 GND BP23 1675, 1630 APCSET BP2 327, -122 MODMON BP24 1515, 1630 APCFILT1 BP3 465, -122 BIASMON BP25 1374, 1630 APCFILT2 BP4 591, -122 V CC BP26 1248, 1630 PWC+ BP5 717, -122 GND BP27 1077, 1630 PWC- BP6 913, -122 MODCOMP BP28 906, 1630 GND BP7 1109, -120 MODSET BP29 780, 1630 VCC BP8 1235, -120 BIASMAX BP30 654, 1630 MK+ BP9 1361, -120 EN BP31 528, 1630 MK- BP10 1500, -120 RTEN BP32 390, 1630 GND BP11 1660, -120 GND BP33 205, 1630 FAIL BP12 1797, 50 V CC BP34 45, 1501 BIAS BP13 1795, 225 DATA+ BP35 45, 1375 VCC BP14 1795, 351 DATA- BP36 45, 1249 MOD BP15 1795, 477 V CC BP37 45, 1123 MOD BP16 1795, 603 V CC BP38 45, 997 MODN BP17 1795, 729 GND BP39 47, 776 MODN BP18 1795, 855 V CC BP40 47, 551 VCC BP19 1795, 981 V CC BP41 47, 425 GND BP20 1795, 1107 CLK+ BP42 47, 299 MD BP21 1797, 1328 CLK- BP43 47, 173 MDMON BP22 1797, 1454 V CC BP44 47, 47 Coordinates are for the center of the pad. Coordinate 0, 0 is the lower left corner of the passivation opening for pad 1.

2.7Gbps Laser Driver with Modulation Compensation Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. 32L QFN.EPS

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline info rmation go to www.maxim-ic.com/packages.)