MAX3869 19-1570 Rev 4 1/05 +3.3V, 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC General Description Features The MAX3869 is a complete, single +3.3V laser driver Single +3.3V or +5V Power Supply for SDH/SONET applications up to 2.5Gbps. The 64mA Supply Current at +3.3V device accepts differential PECL data and clock inputs and provides bias and modulation currents for driving a Programmable Bias Current from 1mA to 100mA laser. A synchronizing input latch can be used (if a Programmable Modulation Current from clock signal is available) to reduce jitter. 5mA to 60mA An automatic power control (APC) feedback loop is incorporated to maintain a constant average optical Bias Current and Modulation Current Monitors power over temperature and lifetime. The wide modula- 87ps Rise/Fall Time tion current range of 5mA to 60mA and bias current of 1mA to 100mA are easy to program, making this prod- Automatic Average Power Control with Failure uct ideal for use in various SDH/SONET applications. Monitor The MAX3869 also provides enable control, two current Complies with ANSI, ITU, and Bellcore monitors that are directly proportional to the laser bias and SDH/SONET Specifications modulation currents, and a failure-monitor output to indi- Enable Control cate when the APC loop is unable to maintain the average optical power. The MAX3869 is available in 32-pin TQFP Ordering Information and small 32-pin QFN packages as well as dice. PART TEMP RANGE PIN-PACKAGE MAX3869EHJ -40C to +85C 32 TQFP-EP* Applications MAX3869EHJ+ -40C to +85C 32 TQFP-EP* SONET/SDH Transmission Systems MAX3869EGJ -40C to +85C 32 QFN** Add/Drop Multiplexers MAX3869E/D -40C to +85C Dice*** Digital Cross-Connects *Exposed pad. **Package Code: G3255-1 Section Regenerators ***Dice are designed to operate over this range, but are tested and 2.5Gbps Optical Transmitters guaranteed at T = +25C only. Contact factory for availability. A +Denotes lead-free package. Pin Configuration appears at end of data sheet. Typical Application Circuit +3.3V +3.3V 0.01F LD 25 FERRITE 124 124 124 124 BEAD DATA+ OUT- 23 DATA- OUT+ MAX3890 0.056F MAX3869 SERIALIZER CLK+ WITH BIAS CLOCK GEN. CLK- MD 84.5 84.5 84.5 84.5 BIASMON 1000pF MODMON +3.3V Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE BIASMAX LATCH MODSET APCSET ENABLE APCFILT FAIL CAPC+3.3V, 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC ABSOLUTE MAXIMUM RATINGS Supply Voltage, V ............................................. -0.5V to +7.0V Voltage at BIAS .........................................+1.0V to (V + 0.5V) CC CC Current into BIAS ...........................................-20mA to +150mA Continuous Power Dissipation (T = +85C) A Current into OUT+, OUT-................................-20mA to +100mA 32-Pin TQFP-EP (derate 22.2mW/C above +85C) ..1444mW Current into MD.....................................................-5mA to +5mA 32-Pin QFN (derate 20.84mW/C above +85C) .......1667mW Voltage at DATA+, DATA-, CLK+, CLK-, ENABLE, Storage Temperature Range .............................-65C to +165C LATCH, FAIL, BIASMON, MODMON .....-0.5V to (V + 0.5V) Operating Junction Temperature Range...........-55C to +150C CC Voltage at APCFILT, CAPC, MODSET, Processing Temperature (die) .........................................+400C BIASMAX, APCSET ...........................................-0.5V to +3.0V Lead Temperature (soldering, 10s) .................................+300C Voltage at OUT+, OUT-.............................+1.5V to (V + 1.5V) CC 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 specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (V = +3.14V to +5.5V, T = -40C to +85C. Typical values are at V = +3.3V, I = 30mA, I = 60mA, T = +25C, unless CC A CC MOD BIAS A otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 2) 64 112 mA CC Bias Current Range I (Note 3) 1 100 mA BIAS Bias Off-Current I ENABLE = low (Note 4) 100 A BIAS-OFF I = 100mA 230 BIAS Bias-Current Stability APC open loop ppm/C I = 1mA 900 BIAS -15 15 Bias-Current Absolute Accuracy (Note 5) APC open loop % Differential Input Voltage V Figure 1 200 1600 mVp-p ID V - V - V - CC CC CC Common-Mode Input Voltage V PECL compatible V ICM 1.49 1.32 V /4 ID Clock and Data Input Current I -1 10 A IN TTL Input High Voltage ENABLE, LATCH 2.0 V TTL Input Low Voltage ENABLE, LATCH 0.8 V Sourcing 50A 2.4 V - 0.3 V V TTL Output High Voltage FAIL CC CC TTL Output Low Voltage FAIL Sinking 100A 0.1 0.44 V Monitor-Diode Reverse Bias 1.5 V Voltage Monitor-Diode DC Current Range I 18 1000 A MD I = 1mA -480 50 480 MD Monitor-Diode Bias Setpoint (Note 6) ppm/C Stability I = 18A 90 MD Monitor-Diode Bias Absolute -15 15 (Note 5) % Accuracy BIASMON to I Gain A I /I 37 A/A BIAS BIAS BIAS BIASMON MODMON to I Gain A I /I 29 A/A MOD MOD MOD MODMON 2 MAX3869