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MAX3740A Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX3740A Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page General Description The MAX3740A is a high-speed VCSEL driver for small- form-factor (SFF) and small-form-factor pluggable (SFP) fiber optic LAN transmitters. It contains a bias genera- tor, a laser modulator, and comprehensive safety fea- tures. The automatic power control (APC) adjusts the laser bias current to maintain average optical power over changes in temperature and laser properties. The driver accommodates common cathode and differential configurations. The MAX3740A operates up to 3.2Gbps. It can switch up to 15mA of laser modulation current and source up to 15mA of bias current. Adjustable temperature com- pensation is provided to keep the optical extinction ratio within specifications over the operating tempera- ture range. The MAX3740A interfaces with the Dallas DS1858 to meet SFF-8472 timing and diagnostic requirements. The MAX3740A accommodates various VCSEL packages, including low-cost TO-46 headers. The MAX3740A safety circuit detects faults that could cause hazardous light levels and disables the VCSEL output. The safety circuits are compliant with SFF and SFP multisource agreements (MSA). The MAX3740A is available in a compact 4mm ✕ 4mm, 24-pin thin QFN package and operates over the -40°C to +85°C temperature range. Applications Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules Gigabit Ethernet Optical Transmitters Fibre Channel Optical Transmitters Infiniband Optical Transmitters Features ♦ Supports all SFF-8472 Digital Diagnostics ♦ 2mA to 15mA Modulation Current ♦ 1mA to 15mA Bias Current ♦ Optional Peaking Current to Improve VCSEL Edge Speed ♦ Supports Common Cathode and Differential Configuration ♦ Automatic Power Control ♦ Safety Circuits Compliant with SFF and SFP MSAs ♦ 4mm ✕ 4mm 24-Pin Thin QFN Package 3.2Gbps SFP VCSEL Driver with Diagnostic Monitors ________________________________________________________________ Maxim Integrated Products 1 Ordering Information VCC REF COMP MD BIAS OUT+ OUT- MODSET BIASSET RBIASSET PWRMON TC1 TC2 IN+ IN- TX_DISABLE FAULT SQUELCH GND 0.01µF 0.01µF 50Ω L1* 0.047µF +3.3V 0.1µF 0.1µF RTC† †OPTIONAL COMPONENT *FERRITE BEAD PEAKSET RPEAKSET† CF† RF† BIASMON RBIASMON 4.7kΩ† RPWRSET RMODSET MAX3740A 19-3118; Rev 1; 6/04 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 MAX3740AETG -40°C to +85°C 24 Thin QFN (4mm x 4mm) MAX3740AETG+ -40°C to +85°C 24 Thin QFN (4mm x 4mm) Typical Application Circuit +Denotes lead-free package. |
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