参数资料
型号: ADN2871ACPZ-RL7
厂商: Analog Devices Inc
文件页数: 1/20页
文件大小: 0K
描述: IC LASER DRIVER 4.25GBPS 24LFCSP
标准包装: 1,500
类型: 激光二极管驱动器(光纤)
数据速率: 4.25Gbps
通道数: 1
电源电压: 3 V ~ 3.6 V
电流 - 电源: 32mA
电流 - 调制: 90mA
电流 - 偏置: 100mA
工作温度: -40°C ~ 85°C
封装/外壳: 24-VFQFN 裸露焊盘,CSP
供应商设备封装: 24-LFCSP-VQ(4x4)
包装: 带卷 (TR)
安装类型: 表面贴装

3.3 V, 50 Mbps to 4.25 Gbps,
Single-Loop, Laser Diode Driver
ADN2871
FEATURES
SFP/SFF and SFF-8472 MSA-compliant
SFP reference design available
50 Mbps to 4.25 Gbps operation
Automatic average power control
Typical rise/fall time 60 ps
Supports VCSEL, DFB, and FP lasers
Bias current range 2 mA to 100 mA
Modulation current range 5 mA to 90 mA
Laser fail alarm and automatic laser shutdown (ALS)
Bias and modulation current monitoring
3.3 V operation
4 mm × 4 mm LFCSP
Voltage setpoint control
Resistor setpoint control
Pin-compatible with ADN2870
APPLICATIONS
1×/2×/4× Fibre Channel SFP/SFF modules
Multirate OC3 to OC48-FEC SFP/SFF modules
LX-4 modules
DWDM/CWDM SFP modules
1GE SFP/SFF transceiver modules
VCSEL, DFB, and FP transmitters
V CC
GENERAL DESCRIPTION
The ADN2871 laser diode driver is designed for advanced SFP
and SFF modules, using SFF-8472 digital diagnostics. The
ADN2871 supports operation from 50 Mbps to 4.25 Gbps.
Average power and extinction ratio can be set with a voltage
provided by a microcontroller DAC or by a trimmable resistor
or digital potentiometer. The average power control loop is
implemented using feedback from a monitor photodiode. The
part provides bias and modulation current monitoring as well
as fail alarms and automatic laser shutdown (ALS). The device
interfaces easily with the Analog Devices, Inc. ADuC70xx
family of MicroConverters? and with the ADN289x family of
limiting amplifiers to make a complete SFP/SFF transceiver
solution. An SFP reference design is available. The product is
pin-compatible with the ADN2870 dual-loop LDD, allowing
one PC board layout to work with either device. For dual-loop
applications, refer to the ADN2870 data sheet.
The product is available in a space-saving 4 mm × 4 mm LFCSP
specified over the ?40°C to +85°C temperature range.
Figure 1 shows an application diagram of the voltage setpoint
control with single-ended laser interface. Figure 36 shows a
differential laser interface.
Tx_DISABLE
Tx_FAULT
V CC
FAIL
ALS
V CC
IMODN
V CC
L
R
V CC
LASER
MPD
IMODP
DATAP
ADI
MICROCONTROLLER
DAC
ADC
PAVSET
PAVREF
RPAV
CONTROL
100 ?
IBIAS
DATAN
V CC
R Z
1k ?
×100
CCBIAS
DAC
GND ERREF
ERSET
1k ?
IMOD
ADN2871
GND
IBMON
IMMON
PAVCAP
NC
V CC GND
1k ?
GND
470 ?
GND
GND
Figure 1. Application Diagram of Voltage Setpoint Control with a Single-Ended Laser Interface
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2007 Analog Devices, Inc. All rights reserved.
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