EVALUATION KIT AVAILABLE MAX3735A 2.7Gbps, Low-Power SFP Laser Driver General Description Features The MAX3735A is a +3.3V laser driver for SFP/SFF appli- Fully Compliant with SFP and SFF-8472 MSAs cations from 155Mbps up to 2.7Gbps. The device accepts Programmable Modulation Current from 10mA to differential input data and provides bias and modulation 60mA (DC-Coupled) currents for driving a laser. DC-coupling to the laser allows Programmable Modulation Current from 10mA to for multirate applications and reduces the number of exter- 85mA (AC-Coupled) nal components. The MAX3735A is fully compliant with the SFP MSA timing and the SFF-8472 transmit diagnostic Programmable Bias Current from 1mA to 100mA requirements. Edge Transition Times <51ps An automatic power-control (APC) feedback loop is incor- 27mA (typ) Power-Supply Current porated to maintain a constant average optical power over Multirate 155Mbps to 2.7Gbps Operation temperature and lifetime. The wide modulation current Automatic Average Power Control range of 10mA to 60mA (up to 85mA AC-coupled) and bias current of 1mA to 100mA make this product ideal for driving On-Chip Pullup Resistor for TX DISABLE FP/DFB laser diodes in fiber-optic modules. The resistor 24-Pin 4mm x 4mm TQFN package range for the laser current settings is optimized to interface with the DS1858 SFP controller IC. The MAX3735A provides transmit-disable control, a single-point latched transmit-failure monitor output, photo- current monitoring, and bias-current monitoring to indicate when the APC loop is unable to maintain the average optical power. The MAX3735A is available in a 4mm x 4mm TQFN pack- age and operates over the extended temperature range of -40C to +85C. Applications Ordering Information appears at end of data sheet. Gigabit Ethernet SFP/SFF Transceiver Modules 1G/2G Fibre Channel SFP/SFF Transceiver Modules Multirate OC3 to OC48-FEC SFP/SFF Transceiver Modules Typical Application Circuit +3.3V OPTIONAL SHUTDOWN CIRCUITRY +3.3V +3.3V 0.01F 15 0.1F OUT- 10 IN+ OUT+ MAX3735A SERDES 0.1F OUT+ IN- BIAS FERRITE BEAD MD C MD DS1858/DS1859 H0 CONTROLLER CAPC IC H1 R BC MON MON1 M0N2 RPC MON M0N3 +3.3V REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE 19-2529 Rev 4 1/13 TX DISABLE MODSET APCSET TX FAULT GND APCFILT1 V CC APCFILT2 BC MON SHUTDOWN PC MONMAX3735A 2.7Gbps, Low-Power SFP Laser Driver Absolute Maximum Ratings Supply Voltage, V ............................................-0.5V to +6.0V Continuous Power Dissipation (T = +70C ) CC A Current into BIAS, OUT+, OUT- ..................... -20mA to +150mA 24-Lead Thin QFN (derate 27.8mW/C Current into MD .................................................... -5mA to +5mA above +70C) ............................................................2222mW Voltage at IN+, IN-, TX DISABLE, TX FAULT, Operating Ambient Temperature Range (T ) ..... -40C to +85C A SHUTDOWN......................................... -0.5V to (V + 0.5V) Storage Ambient Temperature Range .............. -55C to +150C CC Voltage at BIAS, PC MON, BC MON, Die Attach Temperature ...................................................+400C MODSET, APCSET .............................. -0.5V to (V + 0.5V) Lead Temperature (soldering, 10s) .................................+300C CC Voltage at OUT+, OUT- ........................... +0.5V to (V + 1.5V) CC Voltage at APCFILT1, APCFILT2 .............................-0.5V to +3V 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. Package Information PACKAGE TYPE: 24-PIN TQFN Package Code T2444+3 Outline Number 21-0139 Land Pattern Number 90-0021 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated 2 www.maximintegrated.com