ADN2841 Analog Devices, Inc., ADN2841 Datasheet

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ADN2841

Manufacturer Part Number
ADN2841
Description
Dual-loop 50 Mbps.2.7 Gbps Laser Diode Driver
Manufacturer
Analog Devices, Inc.
Datasheet

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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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
REV. A
FEATURES
50 Mbps to 2.7 Gbps Operation
Typical Rise/Fall Time 80 ps
Bias Current Range 2 to 100 mA
Modulation Current Range 5 to 80 mA
Monitor Photodiode Current 50 A to 1200 A
Closed-Loop Control of Power and Extinction Ratio
Laser Fail and Laser Degrade Alarms
Automatic Laser Shutdown, ALS
Dual MPD Functionality for DWDM
Optional Clocked Data
Full Current Parameter Monitoring
5 V Operation
48-Lead LFCSP Package
32-Lead LFCSP Package (Reduced Functionality)
APPLICATIONS
DWDM Dual MPD Wavelength Fixing
SONET OC-1/3/12/48
SDH STM-1/4/16
Fibre Channel
Gigabit Ethernet
MPD
GND
GND
GND
ERSET
IMPD2
PSET
V
IMPD
CC
GND
ERCAP
FUNCTIONAL BLOCK DIAGRAM
GND
CONTROL
PAVCAP
I
I
MOD
BIAS
IDTONE
GENERAL DESCRIPTION
The ADN2841 uses a unique control algorithm to control both
the average power and extinction ratio of the laser diode (LD)
after initial factory setup. External component count and PCB area
are low, since both power and extinction ratio control are fully
integrated. Programmable alarms are provided for laser fail (end
of life) and laser degrade (impending fail).
The ADN2841 has circuitry for a second monitor photodiode,
which enables DWDM wavelength control.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel:
Fax: 781/326-8703
V
CC
781/329-4700
IMODN
Dual-Loop 50 Mbps–2.7 Gbps
ADN2841
LBWSET
IMODP
IBIAS
ASET
GND
Laser Diode Driver
DATAP
DATAN
CLKP
CLKN
LD
V
CC
© Analog Devices, Inc., 2002
ADN2841
www.analog.com

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ADN2841 Summary of contents

Page 1

... Analog Devices. Dual-Loop 50 Mbps–2.7 Gbps GENERAL DESCRIPTION The ADN2841 uses a unique control algorithm to control both the average power and extinction ratio of the laser diode (LD) after initial factory setup. External component count and PCB area are low, since both power and extinction ratio control are fully integrated ...

Page 2

... ADN2841–SPECIFICATIONS Parameter LASER BIAS (BIAS) Output Current I BIAS Compliance Voltage I during ALS BIAS ALS Response Time CCBIAS Compliance Voltage MODULATION CURRENT (IMODP, IMODN) Output Current I MOD Compliance Voltage I during ALS MOD Rise Time Fall Time Jitter Pulsewidth Distortion MONITOR PD (MPD, MPD2) ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADN2841 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... Modulation Current Mirror Output Bias Current Mirror Output Supply Ground IDTONE (Requires External Current Sink to Ground) Supply Ground –4– 32-Lead LFCSP 24 IBMON PIN 1 INDICATOR ASET 2 23 IMMON 22 GND3 ADN2841 21 VCC3 PSET 4 TOP VIEW 20 ALS IMPD 5 (Not to Scale) 19 FAIL 18 DEGRADE GND4 7 17 CLKSEL VCC4 8 ) ...

Page 5

... Modulation Current Negative Output. Connect to 25 Ω. Supply Ground Modulation Current Positive Output. Connect to laser diode. Modulation Current Positive Output. Connect to laser diode. Supply Ground Supply Ground Laser Diode Bias Current Laser Diode Bias Current Extra Laser Diode Bias when AC-Coupled –5– ADN2841 ...

Page 6

... GΩ time constant of 1000 sec, whichever is less. The ADN2841 may be optimized for 2.7 Gbps operation by keeping the LBWSET pin low. This results in a much shorter loop time constant (a 10 reduction). The value of PAVCAP and ERCAP capacitors required for 2 ...

Page 7

... Figure 3. Circuitry to Allow Fiber Identification CCBIAS CCBIAS should be connected to the BIAS pin if the laser diode is connected to the ADN2841 using a capacitor. CCBIAS is a current sink to GND. AUTOMATIC LASER SHUTDOWN The ADN2841 ALS allows compliance to ITU-T-G958 (11/94), section 9.7. When ALS is logic high, both bias and modulation currents are turned off ...

Page 8

... FU-445SDF-WM1 SHOULD HAVE BYPASS CAPACITORS AS CLOSE AS POSSIBLE TO THE CC ACTUAL SUPPLY PINS ON THE ADN2841 AND THE LASER DIODE USED. Figure 6. 2.7 Gbps Test Circuit, DC-Coupled, Data Not Clocked, Fast Loop Time Constant Selected alarm output levels must TX RX CLK CS × ...

Page 9

... SHOULD HAVE BYPASS CAPACITORS AS CLOSE AS POSSIBLE TO THE CC ACTUAL SUPPLY PINS ON THE ADN2841 AND THE LASER DIODE USED. Figure 7. Anyrate Test Circuit, Capacitively Coupled, Data Clocked, Slow Loop Time Constant Selected REV ...

Page 10

... NOTES SHOULD HAVE BYPASS CAPACITORS CC AS CLOSE AS POSSIBLE TO THE ACTUAL SUPPLY PINS ON THE ADN2841 AND THE LASER DIODE USED. 10nF 2. THE OP293 HAS BEEN SELECTED BECAUSE 100nH OF ITS GAIN-BANDWIDTH PRODUCT AND SHOULD BE USED IN THIS APPLICATION GND2 ...

Page 11

... Frame Chip Scale Package [LFCSP] (CP-32) Dimensions shown in millimeters 5.00 BSC SQ 0.60 MAX 0.50 4.75 BSC TOP BSC SQ VIEW 0.50 0.40 0.30 0.70 MAX 0.65 NOM 0.05 MAX 0.02 NOM 0.30 0.25 REF COPLANARITY 0.23 0.08 0.18 COMPLIANT TO JEDEC STANDARDS MO-220-VHHD-2 –11– ADN2841 0.30 0.23 0.60 MAX PIN 1 0.18 INDICATOR 48 1 5.25 BOTTOM 4.70 VIEW 2. 5.50 REF 0.60 MAX PIN 1 INDICATOR 3.25 BOTTOM SQ 3 ...

Page 12

Revision History Location 8/02—Data Sheet changed from REV REV. A. Figure 8 replaced . . . . . . . . . . . . . . . . . . . . . . . . . ...

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