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PDF ADN2841 Data sheet ( Hoja de datos )
| Número de pieza | ADN2841 | |
| Descripción | Dual-Loop 50 Mbps.2.7 Gbps Laser Diode Driver | |
| Fabricantes | Analog Devices | |
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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
Fiber Channel
Gigabit Ethernet
Dual-Loop 50 Mbps–2.7 Gbps
Laser Diode Driver
ADN2841
GENERAL DESCRIPTION
The ADN2841 uses a unique control algorithm to control both
average power and extinction ratio of the laser diode (LD) after
initial factory set up. External component count and PCB area are
low as 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.
FUNCTIONAL BLOCK DIAGRAM
MPD
VCC
IMPD
IMPD2
GND PSET
GND ERSET
GND
ERCAP
GND
VCC
IMODN
IMODP
VCC
LD
IMOD
CONTROL
IBIAS
PAVCAP
GND
IDTONE
ADN2841
LBWSET
DATAP
DATAN
CLKP
CLKN
IBIAS
ASET
GND
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
1 page  
Pin No.
48-Lead 32-Lead
37
38 25
39 26
40
41 27
42 28
43
44 29
45 30
46 31
47
48 32
PIN FUNCTION DESCRIPTIONS (continued)
ADN2841
Mnemonic
GND2
VCC2
IMODN
IMODN
GND2
IMODP
IMODP
GND2
GND2
IBIAS
IBIAS
CCBIAS
Function
Supply Ground
Supply Voltage
Modulation Current Negative Output, connect to 25 Ω
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
REV. 0
–5–
5 Page 
ADN2841
OUTLINE DIMENSIONS
Dimensions shown in millimeters and (inches).
48-Lead (7؋7) LFCSP (Exposed Paddle)
(CP-48)
7.00 (0.276)
BSC SQ
PIN 1
INDICATOR
0.60 (0.024)
0.42 (0.017)
0.24 (0.009)
0.60 (0.024)
0.42 (0.017)
0.24 (0.009)
37
36
0.30 (0.012)
0.23 (0.009)
0.18 (0.007)
48
1
TOP
VIEW
6.75 (0.266)
BSC SQ
BOTTOM
VIEW
5.25 (0.207)
5.10 (0.201) SQ
4.95 (0.195)
12؇ MAX
0.90 (0.035) MAX
0.85 (0.033) NOM
0.50 (0.020)
0.40 (0.016)
0.30 (0.012)
0.70 (0.028) MAX
0.65 (0.026) NOM
25
24
5.50 (0.217)
REF
0.50 (0.0197)
BSC
0.05 (0.0020)
0.01 (0.0004)
0.20 (0.0079) 0.00 (0.0000)
REF
NOTE
EXPOSED PADDLE SHOULD BE SOLDERED TO THE MOST
NEGATIVE SUPPLY OF THE ADN2841
12
13
32-Lead (5؋5) LFCSP (Exposed Paddle)
(CP-32)
PIN 1
INDICATOR
5.00 (0.197)
BSC SQ
TOP
VIEW
0.60 (0.024)
0.42 (0.017)
0.24 (0.009)
4.75 (0.187)
BSC SQ
0.30 (0.0118)
0.23 (0.0091)
0.18 (0.0071)
25
24
32 1
BOTTOM
VIEW
12؇ MAX
0.90 (0.035) MAX
0.85 (0.033) NOM
0.50 (0.0197)
BSC
0.70 (0.028) MAX
0.65 (0.026) NOM
0.50 (0.020)
0.40 (0.016)
0.30 (0.012)
0.05 (0.0020)
0.01 (0.0004)
0.20 (0.0079) 0.00 (0.0000)
REF
17
16
98
5.60 (0.220 )
REF
NOTES
1. DIMENSIONS MEET JEDEC MO-220-VHHD-2
2. EXPOSED PADDLE SHOULD BE SOLDERED TO THE
MOST NEGATIVE SUPPLY OF THE ADN2841
3.25 (0.128)
3.10 (0.122)
2.95 (0.116)
REF SQ
REV. 0
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADN2841.PDF ] | |
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