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