ADN2848 Driver Datasheet

ADN2848 Datasheet PDF, Equivalent


Part Number

ADN2848

Description

3V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver

Manufacture

Analog Devices

Total Page 12 Pages
PDF Download
Download ADN2848 Datasheet PDF


ADN2848
a
3 V Dual-Loop 50 Mbps to 1.25 Gbps
Laser Diode Driver
ADN2848
FEATURES
50 Mbps to 1.25 Gbps Operation
Single 3.3 V Operation
Bias Current Range 2 mA to 100 mA
Modulation Current Range 5 mA to 80 mA
Monitor Photo Diode Current 50 A to 1200 A
50 mA Supply Current at 3.3 V
Closed-Loop Control of Power and Extinction Ratio
www.DataSheet4UF.cuollmCurrent 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 Package
APPLICATIONS
SONET OC-1/3/12
SDH STM-0/1/4
Fibre Channel
Gigabit Ethernet
GENERAL DESCRIPTION
The ADN2848 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 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).
MPD
VCC
IMPD
PSET
GND ERSET
GND
FUNCTIONAL BLOCK DIAGRAM
VCC
IMODN
IMODP
VCC
LD
IMOD
CONTROL
IBIAS
ERCAP
DATAP
DATAN
CLKP
CLKN
IBIAS
ADN2848
ASET
PAVCAP
LBWSET
GND
GND
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. Trademarks and
registered trademarks are the property of their respective companies.
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 © 2003 Analog Devices, Inc. All rights reserved.

ADN2848
ADN2848–SPECIFICATIONS (VCC = 3.0 V to 3.6 V. All specifications TMIN to TMAX, unless otherwise noted.1
Typical values as specified at 25؇C.)
Parameter
Min Typ Max
Unit Conditions/Comments
LASER BIAS (BIAS)
Output Current IBIAS
Compliance Voltage
IBIAS During ALS
ALS Response Time
CCBIAS Compliance Voltage
MODULATION CURRENT (IMODP, IMODN)
Output Current IMOD
Compliance Voltage
IMOD During ALS
Rise Time2
Fall Time2
www.DataShReeant4dUo.cmomJitter2
Pulsewidth Distortion2
MONITOR PD (MPD)
Current
Compliance Voltage
2
1.2
1.2
5
1.5
80
80
1
15
50
100
VCC
0.1
5
VCC
80
VCC
0.1
170
170
1.5
1200
1.65
mA
V
mA
s IBIAS < 10% of nominal
V
mA
V
mA
ps
ps
ps RMS
ps IMOD = 40 mA
A Average Current
V
POWER SET INPUT (PSET)
Capacitance
Monitor Photodiode Current into RPSET Resistor
Voltage
EXTINCTION RATIO SET INPUT (ERSET)
Allowable Resistance Range
Voltage
ALARM SET (ASET)
Allowable Resistance Range
Voltage
Hysteresis
50
1.1
1.2
1.1
1.2
1.1
1.2
1.2
1.2
5
80
1200
1.3
25
1.3
25
1.3
pF
A Average Current
V
k
V
k
V
%
CONTROL LOOP
Time Constant
0.22
2.25
DATA INPUTS (DATAP, DATAN, CLKP, CLKN)3
V p-p (Single-Ended, Peak-to-Peak)
100 500
Input Impedance (Single-Ended)
tSETUP4 (see Figure 1)
tHOLD4 (see Figure 1)
50
50
100
Low Loop Bandwidth Selection
s LBWSET = GND
s LBWSET = VCC
mV Data and Clock Inputs Are
AC-Coupled
ps
ps
LOGIC INPUTS (ALS, LBWSET, CLKSEL)
VIH
VIL
ALARM OUTPUTS (Internal 30 kPull-Up)
VOH
VOL
2.4
2.4
V
0.8 V
V
0.8 V
IBMON, IMMON, IMPDMON
IMMON Division Ratio
IMPDMON
Compliance Voltage
100 A/A
1 A/A
0 VCC – 1.2 V
SUPPLY
ICC5
VCC6
50
3.0 3.3
3.6
mA IBIAS = IMOD = 0
V
NOTES
1Temperature range is as follows: –40°C to +85°C.
2Measured into a 25 load using a 0-1 pattern at 622 Mbps.
3When the voltage on DATAP is greater than the voltage on DATAN, the modulation current flows in the IMODP pin.
4Guaranteed by design and characterization. Not production tested.
5ICCMIN for power calculation on page 6 is the typical ICC given.
6All VCC pins should be shorted together.
Specifications subject to change without notice.
–2– REV. 0


Features a FEATURES 50 Mbps to 1.25 Gbps Operatio n Single 3.3 V Operation Bias Current R ange 2 mA to 100 mA Modulation Current Range 5 mA to 80 mA Monitor Photo Diode Current 50 ␮ A to 1200 ␮ A 50 mA S upply Current at 3.3 V Closed-Loop Cont rol of Power and Extinction Ratio www.D ataSheet4U.com Full Current Parameter M onitoring Laser Fail and Laser Degrade Alarms Automatic Laser Shutdown, ALS Op tional Clocked Data Supports FEC Rates 32-Lead (5 mm × 5 mm) LFCSP Package AP PLICATIONS SONET OC-1/3/12 SDH STM-0/1/ 4 Fibre Channel Gigabit Ethernet 3 V D ual-Loop 50 Mbps to 1.25 Gbps Laser Dio de Driver ADN2848 GENERAL DESCRIPTION The ADN2848 uses a unique control algor ithm to control both the average power and extinction ratio of the laser diode , LD, after initial factory setup. Exte rnal component count and PCB area are l ow as both power and extinction ratio c ontrol are fully integrated. Programmab le alarms are provided for laser fail ( end of life) and laser degrade (impending fail). FUNCTIONAL BLOCK D.
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