ADN2848ACP-32-RL Analog Devices Inc, ADN2848ACP-32-RL Datasheet

IC DVR LASER DIODE 3V 32-LFCSP

ADN2848ACP-32-RL

Manufacturer Part Number
ADN2848ACP-32-RL
Description
IC DVR LASER DIODE 3V 32-LFCSP
Manufacturer
Analog Devices Inc
Type
Laser Diode Driver (Fiber Optic)r
Datasheet

Specifications of ADN2848ACP-32-RL

Number Of Channels
1
Rohs Status
RoHS non-compliant
Data Rate
1.25Gbps
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
50mA
Current - Modulation
80mA
Current - Bias
100mA
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VFQFN, CSP Exposed Pad
Mounting Type
Surface Mount
Operating Supply Voltage (min)
3V
Mounting
Surface Mount
Lead Free Status / RoHS Status
Not Compliant
FEATURES
50 Mbps to 1.25 Gbps operation
Single 3.3 V operation
Bias current range: 2 to 100 mA
Modulation current range: 5 to 80 mA
Monitor photo diode current: 50 μA to 1200 μA
50 mA supply current at 3.3 V
Closed-loop control of power and extinction ratio
Full current parameter monitoring
Laser fail and laser degrade alarms
Automatic laser shutdown (ALS)
Optional clocked data
Supports FEC rates
32-lead, 5 mm × 5 mm LFCSP_VQ package
APPLICATIONS
SONET OC-1/3/12/24
SDH STM-0/1/4
Fibre Channel
Gigabit Ethernet
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.
MPD
GND
GND
V
CC
ERSET
PSET
IMPD
FUNCTIONAL BLOCK DIAGRAM
GND
3.3 V Dual-Loop 50 Mbps to 1.25 Gbps
CONTROL
ERCAP
Figure 1.
I
I
MOD
BIAS
GND
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADN2848 uses a unique control algorithm to control both
the average power and the extinction ratio of the laser diode
(LD) after initial factory setup. External component count and
PCB area are low because both power and extinction ratio
control are fully integrated. Programmable alarms are provided
for laser fail (end of life) and laser degrade (impending fail).
V
CC
PAVCAP
IMODN
ADN2848
LBWSET
IMODP
I
ASET
©2006 Analog Devices, Inc. All rights reserved.
BIAS
GND
Laser Diode Driver
DATAP
DATAN
CLKP
CLKN
LD
V
CC
V
CC
R
Z
ADN2848
www.analog.com

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ADN2848ACP-32-RL Summary of contents

Page 1

FEATURES 50 Mbps to 1.25 Gbps operation Single 3.3 V operation Bias current range 100 mA Modulation current range Monitor photo diode current: 50 μA to 1200 μ supply current at 3.3 ...

Page 2

ADN2848 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Theory of Operation ...

Page 3

SPECIFICATIONS 3.6 V. All specifications T CC Table 1. Parameter LASER BIAS Current (I , ALS) BIAS Output Current I BIAS Compliance Voltage I BIAS ALS Response Time CCBIAS Compliance Voltage MODULATION CURRENT (IMODP, IMODN) ...

Page 4

ADN2848 Parameter SUPPLY Temperature range is −40°C to +85°C. 2 Measured into a 25 Ω load using a 0-1 pattern at 622 Mbps. 3 When the voltage on DATAP is greater than the ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter V to GND CC Digital Inputs (ALS, LBWSET, CLKSEL) IMODN, IMODP Operating Temperature Range Industrial Storage Temperature Range Junction Temperature (T Max) J 32-Lead LFCSP_VQ Package 1 Power Dissipation 2 θ Thermal Impedance JA ...

Page 6

ADN2848 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 LBWSET Loop Bandwidth Select. 2 ASET Alarm Threshold Set Pin. 3 ERSET Extinction Ratio Set Pin. 4 PSET Average Optical Power Set Pin. 5 ...

Page 7

THEORY OF OPERATION A laser diode (LD) has current-in to light-out transfer functions, as shown in Figure 4. Two key characteristics of this transfer function are the threshold current and slope in the linear region beyond TH the ...

Page 8

ADN2848 Example FAIL DEGRADE FAIL I 500 μA ASET 100 100 ...

Page 9

POWER CONSUMPTION The ADN2848 die temperature must be kept below 125°C. The LFCSP_VQ package has an exposed paddle. The exposed paddle should be connected in such a manner that the same potential as the ADN2848 ground pins. ...

Page 10

ADN2848 1.5kΩ IMODN * GND2 MPD LD IMODP GND2 * R Z GND2 I BIAS 10µH CCBIAS LASER DIODE MPD = MONITOR PHOTODIODE NOTES * DESIGNATES COMPONENTS ...

Page 11

1.5kΩ IMODN GND2 MPD LD IMODP * * GND2 * GND2 I BIAS 10µH CCBIAS LASER DIODE MPD = ...

Page 12

... OUTLINE DIMENSIONS PIN 1 INDICATOR 12° MAX 1.00 0.85 0.80 SEATING PLANE ORDERING GUIDE Model ADN2848ACP-32 ADN2848ACP-32-RL ADN2848ACP-32-RL7 1 ADN2848ACPZ-32 1 ADN2848ACPZ-32-RL 1 ADN2848ACPZ-32-RL7 Pb-free part. ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02746-0-10/06(A) 5.00 BSC SQ 0 ...

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