ADN2872

3.3 V双循环， 50 Mbps至3.3 Gbps的激光二极管驱动器 3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

Product Details

Like the ADN2870, the laser diode driver is designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The device features dual-loop control of the average power and extinction ratio ER, which automatically compensates for variations in laser characteristics over temperature and aging. The laser needs only be calibrated at 25°C, eliminating the need for expensive and time consuming temperature calibration. The ADN2872 supports single-rate operation from 50 Mbps to 3.3 Gbps, or multirate operation from 155 Mbps to 3.3 Gbps. With a new alarm scheme, this device avoids the shutdown issue caused by the system transient generated from various lasers.

The average power and ER can be set with a voltage provided by a microcontroller digital-to-analog converter DAC or by a trimmable resistor. The device provides both bias and modulation current monitoring, as well as fail alarms and automatic laser shutdown. The ADN2872, a SFF-/SFP-compliant laser diode driver, can work with the Analog Devices, Inc., ADuC7019, ADuC7020, and ADuC7023 MicroConverter® family and the ADN2890, ADN2891, and ADN2892 limiting amplifier family, to form a complete SFP/SFF transceiver solution. The ADN2872 is available in a space-saving 4 mm × 4 mm LFCSP specified over the −40°C to +85°C temperature range.

Applications

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Multirate OC3 to OC48-FEC SFP/SFF modules

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1×/2×/4× Fibre Channel SFP/SFF modules

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LX-4 modules

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DWDM/CWDM SFP modules

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1GE SFP/SFF transceiver modules

### Features and Benefits

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SFP/SFF and SFF-8472 MSA compliant

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SFP reference design available

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Any rate from 50 Mbps to 3.3 Gbps operation

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Dual-loop control of average power and extinction ratio

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Typical rise/fall time: 60 ps

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Bias current range: 2 mA to 100 mA

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Modulation current range: 5 mA to 90 mA

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Laser FAIL alarm and automatic laser shutdown ALS

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Bias and modulation current monitoring

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3.3 V operation

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4 mm × 4 mm LFCSP

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Voltage setpoint control

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Resistor setpoint control