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MAX3738 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX3738 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX3738 is a +3.3V laser driver designed for mul- tirate transceiver modules with data rates from 155Mbps to 4.25Gbps. Lasers can be DC-coupled to the MAX3738 for reduced component count and ease of multirate operation. Laser extinction ratio control (ERC) combines the features of automatic power control (APC), modulation compensa- tion, and built-in thermal compensation. The APC loop maintains constant average optical power. Modulation compensation increases the modulation current in pro- portion to the bias current. These control loops, com- bined with thermal compensation, maintain a constant optical extinction ratio over temperature and lifetime. The MAX3738 accepts differential data input signals. The wide 5mA to 60mA (up to 85mA AC-coupled) mod- ulation current range and up to 100mA bias current range, make the MAX3738 ideal for driving FP/DFB lasers in fiber optic modules. External resistors set the required laser current levels. The MAX3738 provides transmit disable control (TX_DISABLE), single-point fault tolerance, bias-current monitoring, and photocur- rent monitoring. The device also offers a latched failure output (TX_FAULT) to indicate faults, such as when the APC loop is no longer able to maintain the average optical power at the required level. The MAX3738 is compliant with the SFF-8472 transmitter diagnostic and SFP MSA timing requirements. The MAX3738 is offered in a 4mm x 4mm, 24-pin thin QFN package and operates over the extended -40 °C to +85 °C temperature range. Applications Multirate OC-3 to OC-48 FEC Transceivers Gigabit Ethernet SFF/SFP and GBIC Transceivers 1Gbps/2Gbps/4Gbps Fibre Channel SFF/SFP and GBIC Transceivers Features ♦ Single +3.3V Power Supply ♦ 47mA Power-Supply Current ♦ 85mA Modulation Current ♦ 100mA Bias Current ♦ Automatic Power Control (APC) ♦ Modulation Compensation ♦ On-Chip Temperature Compensation ♦ Self-Biased Inputs for AC-Coupling ♦ Ground-Referenced Current Monitors ♦ Laser Shutdown and Alarm Outputs ♦ Enable Control and Laser Safety Feature 155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-3162; Rev 2; 12/08 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN-PACKAGE MAX3738ETG -40°C to 85°C 24 Thin QFN-EP* MAX3738ETG+ -40°C to 85°C 24 Thin QFN-EP* BIAS VCC VCC TX_DISABLE MODTCOMP OUT+ VCC VCC MD 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 13 14 15 16 17 18 TOP VIEW *THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY GROUND ON THE CIRCUIT BOARD. PIN1 INDICATED BY + ON LEAD-FREE PACKAGE. IN+ IN- OUT- MAX3738 *EP Pin Configuration Typical Application Circuit appears at end of data sheet. + Denotes a lead(Pb)-free/RoHS-compliant package. * EP = Exposed pad. |
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