ADN2843CHIPSET-B Analog Devices Inc, ADN2843CHIPSET-B Datasheet

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ADN2843CHIPSET-B

Manufacturer Part Number
ADN2843CHIPSET-B
Description
IC CHIPSET LDD DUAL LOOP BAREDIE
Manufacturer
Analog Devices Inc
Type
Laser Diode Driver (Fiber Optic)r
Datasheet

Specifications of ADN2843CHIPSET-B

Rohs Status
RoHS non-compliant
Data Rate
10.709Gbps
Number Of Channels
1
Voltage - Supply
3 V ~ 3.6 V
Current - Modulation
80mA
Current - Bias
80mA
Operating Temperature
-40°C ~ 85°C
Package / Case
DICE
Mounting Type
Surface Mount
a
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. 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 companies.
FEATURES
Data Rates from 9.952 Gbps to 10.709 Gbps
Typical Rise/Fall Time 25 ps/23 ps
Bias Current Range 3 mA to 80 mA
Modulation Current Range 5 mA to 80 mA
Monitor Photodiode Current 50 A to 1200 A
Closed-Loop Control of Both Average Optical Power
Laser Fail and Laser Degrade Alarms
Automatic Laser Shutdown, ALS
Dual MPD Functionality for Wavelength Control
CML Data Inputs
50
3.3 V Single-Supply Operation
Driver Supplied in Dice Format
APPLICATIONS
SONET OC-192, SDH STM-64
Supports 10.667 Gbps and 10.709 Gbps FEC Rates
10 Gb Ethernet IEEE802.3ae
and Extinction Ratio
Internal Data Terminations
MPD
ERSET
GND
*ADN2850 OR ADN2860 OPTICAL SUPERVISOR
PSET
MODE
ALS
GND
IMPD2
GND
V
IMPD
CC
*
*
GND
V
CC
IDTONE
CONTROL
ERCAP
FUNCTIONAL BLOCK DIAGRAM
ADN2844
PAVCAP
D_IMOD
GND
ADN2843
IMOD_CTRL
IBIAS_CTRL
ASET
GENERAL DESCRIPTION
The ADN2943 chipset consists of two components, the ADN2845
and the ADN2844. The ADN2845 is a 10.709 Gbps laser diode
driver. The ADN2845 eliminates the need to ac couple since it
can deliver 80 mA of modulation while dc coupled to the laser
diode. It is intended to be copackaged with the laser to minimize
bond lengths, which improves performance of the optical
transmitter. For transmission line applications, contact HSN
Application Group at fiberoptic.ic@analog.com.
The ADN2844 offers a unique control loop algorithm and pro-
vides dual loop control of both average power and extinction ratio.
Programmable alarms are provided for laser fail (end of life) and
laser degrade (impending fail).
Both the ADN2844 and the ADN2845 are available as bare die.
The ADN2844 is also available in 5 mm ¥ 5 mm 32-lead LFCSP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
IMODN
V
CC
10.709 Gbps Laser Diode
ALS
© 2003 Analog Devices, Inc. All rights reserved.
ADN2845
GND
V
CC
GND
IMODP
IBIAS
DATAP
DATAN
Driver Chipset
V
CC
ADN2843
LD
www.analog.com

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ADN2843CHIPSET-B Summary of contents

Page 1

FEATURES Data Rates from 9.952 Gbps to 10.709 Gbps Typical Rise/Fall Time 25 ps/23 ps Bias Current Range Modulation Current Range Monitor Photodiode Current 1200 A ...

Page 2

ADN2843–SPECIFICATIONS Parameter LASER BIAS (BIAS) Output Current I BIAS Compliance Voltage I during ALS BIAS ALS Shutdown Response Time MODULATION CURRENT (IMODP, IMODN) Output Current I MOD Compliance Voltage I during ALS MOD Rise Time Fall Time Random Jitter Total ...

Page 3

... ADN2843 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. REV. 0 Model + 0 1.2 V ADN2843CHIPSET CC ADN2843CHIPSET-B –40°C to +85°C ADN2844 Control EVAL-ADN2843 ADN2844 METALLIZATION PHOTOGRAPH 3000 m –3– ADN2843 ORDERING GUIDE Temperature Package Range Option – ...

Page 4

ADN2843 1340 ASET 1 2 ERSET PSET 3 ADN2844 GND 4 BOND PAD SIZE: >115 m 5 IMPD BOND PAD PITCH: >104 m DIE SIZE: 3000 m IMPDMON 6 IMPDMON2 ...

Page 5

Pin No. Mnemonic Function 1 ASET Alarm Current Threshold Set (Should be Terminated with a 1.2 k Resistor when Not Used) 2 ERSET Extinction Ratio Current Set 3 PSET Average Optical Power Set 4 GND Negative Supply 5 IMPD Monitor ...

Page 6

ADN2843 GENERAL Laser diodes have current-in to light-out transfer functions as shown in Figure 1. Two key characteristics of this transfer function are the threshold current and slope in the linear region TH beyond the threshold current, referred ...

Page 7

The laser fail alarm, FAIL, is activated when the transmitter can no longer be guaranteed to be SONET/SDH compliant. This occurs when one of the following conditions arise: ∑ The ASET threshold is reached. ∑ The ALS pin is set ...

Page 8

ADN2843 NOTES *FOR DIGITAL PROGRAMMING, THE ADN2850 OR ADN2860 OPTICAL SUPERVISOR CAN BE USED. **OPTIONAL MONITORING OF CURRENTS. • Best high frequency board layout techniques including power and ground planes should be ...

Page 9

NOTES *FOR DIGITAL PROGRAMMING, THE ADN2850 OR ADN2860 OPTICAL SUPERVISOR CAN BE USED. **OPTIONAL MONITORING OF CURRENTS. REV 100 F TANTALUM 10nF 10nF V ...

Page 10

ADN2843 PARALLEL PLATE DECOUPLING CAPACITOR GROUND PLANE MPD 50 TRANSMISSION LINE GROUND PLANE NOTES • FOR OPTIMUM PERFORMANCE, RIBBON BONDS ARE RECOMMENDED ON PADS 1, 5, 12, AND 14. WIRES ARE 3 MIL OR 5 MIL RIBBONS <400 m • ...

Page 11

ADN2844 Pad Number Pad Name ASET 2 ERSET 3 PSET 4 GND 5 IMPD 6 IMPDMON 7 IMPDMON2 8 IMPD2 –1056.00 9 GND –1339. –1339. ERCAP –1339.00 12 PAVCAP –1339.00 13 MODE ...

Page 12

ADN2843 PIN 1 INDICATOR 12 MAX 1.00 0.90 0.80 SEATING PLANE Exposed paddle should be soldered to the most negative supply of the ADN284 (ADN2844 also available as bare die) OUTLINE DIMENSIONS 32-Lead Lead Frame Chip Scale Package [LFCSP] 5 ...

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