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參數(shù)資料
| 型號(hào)： | ADN2870ACPZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 其它接口 |
| 英文描述： | High Bandwidth, CMOS 8-Bit Serial Interface Multiplying D/A Converter; Package: MSOP; No of Pins: 10; Temperature Range: Industrial |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, MO-220VGGD-2, LFCSP-24 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 764K |
| 代理商： | ADN2870ACPZ |
3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps
Laser Diode Driver
ADN2870
FEATURES
SFP/SFF and SFF-8472 MSA-compliant
SFP reference design available
50 Mbps to 3.3 Gbps operation
Multirate 155 Mbps to 3.3 Gbps operation
Dual-loop control of average power and extinction ratio
Typical rise/fall time 60 ps
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 package
Voltage setpoint control
Resistor setpoint control
APPLICATIONS
Multirate OC3 to OC48-FEC SFP/SFF modules
1×/2×/4× Fibre channel SFP/SFF modules
LX-4 modules
DWDM/CWDM SFP modules
1GE SFP/SFF transceiver modules
Rev.
0
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.
Tel: 781.329.4700Fax: 781.326.8703
www.analog.comGENERAL DESCRIPTION
The ADN2870 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, which automatically compensates for variations in laser
characteristics over temperature and aging. The laser need only
be calibrated at 25°C, eliminating the need for expensive and
time consuming temperature calibration. The ADN2870 supports
single-rate operation from 50 Mbps to 3.3 Gbps or multirate
from 155 Mbps to 3.3 Gbps.
Average power and extinction ratio can be set with a voltage
provided by a microcontroller DAC or by a trimmable resistor.
The part provides bias and modulation current monitoring as
well as fail alarms and automatic laser shutdown. The device
interfaces easily with the ADI ADuC70xx family of micro-
converters 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 available in a space-
saving 4 mm ×4 mm LFCSP package specified over the 40°C to
+85°C temperature range.
0
ADI
MICROCONTROLLER
Tx_FAULT
Tx_FAIL
CONTROL
PAVREF
PAVSET
ADN2870
RPAV
GND
DAC
DAC
VCC
MPD
ERREF
ERSET
GND
IMOD
DATAP
IMODP
DATAN
IBIAS
IMODN
IBMON
IMMON
ALS
FAIL
IBIAS
100
CCBIAS
VCC
LASER
L
R
VCC
VCC
VCC
GND
GND
PAVCAP
470
1k
GND
GND
ERCAP
GND
1k
1k
ADC
VCC
Figure 1. Application Diagram Showing Microcontroller Interface
Protected by US patent: US6414974
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