ADN2830ACP32 Analog Devices Inc, ADN2830ACP32 Datasheet

IC,Laser Diode/LED Driver,LLCC,32PIN,PLASTIC

ADN2830ACP32

Manufacturer Part Number
ADN2830ACP32
Description
IC,Laser Diode/LED Driver,LLCC,32PIN,PLASTIC
Manufacturer
Analog Devices Inc
Type
Laser Diode Controller (Fiber Optic)r
Datasheet

Specifications of ADN2830ACP32

Rohs Status
RoHS non-compliant
Number Of Channels
1
Voltage - Supply
4.5 V ~ 5.5 V
Current - Supply
25mA
Current - Bias
200mA
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VFQFN, CSP Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
a
REV. A
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. 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
Bias Current Range 4 mA to 200 mA
Monitor Photodiode Current 50 A to 1200 A
Closed-Loop Control of Average Power
Laser FAIL and Laser DEGRADE Alarms
Automatic Laser Shutdown, ALS
Full Current Parameter Monitoring
5 V Operation
–40 C to +85 C Temperature Range
5 mm
APPLICATIONS
Fiber Optic Communication
5 mm 32-Lead LFCSP Package
R
MPD
PSET
GND
V
CC
GND
PSET
IMPD
IBMON
IMPDMON
FUNCTIONAL BLOCK DIAGRAM
ALS
GND
PAVCAP
FAIL
CONTROL
GENERAL DESCRIPTION
The ADN2830 provides closed-loop control of the average
optical power of a continuous wave (CW) laser diode (LD)
after initial factory setup. The control loop adjusts the laser
IBIAS to maintain a constant back facet monitor photodiode
(MPD) current and thus a constant laser optical power. The
external PSET resistor is adjusted during factory setup to set
the desired optical power. R
is the MPD current corresponding to the desired optical power.
Programmable alarms are provided for laser fail (end of life)
and laser degrade (impending fail).
To provide monitoring of the MPD current, the MPD can be
connected to the IMPD pin. In this case, the MPD current is
mirrored to the IMPDMON pin to provide a monitor and
internally to the PSET pin to close the control loop.
By closing the feedback using IBMON rather than an MPD
connected to PSET, the device is configured to control a constant
current in the laser rather than a constant optical output power.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
DEGRADE
MODE
Average Power Controller
Continuous Wave Laser
V
CC
© 2003 Analog Devices, Inc. All rights reserved.
GND
PSET
IBIAS
ASET
LD
GND
is set at 1.23/I
V
CC
R ASET
ADN2830
AV
www.analog.com
, where I
AV

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ADN2830ACP32 Summary of contents

Page 1

FEATURES Bias Current Range 200 mA Monitor Photodiode Current 1200 A Closed-Loop Control of Average Power Laser FAIL and Laser DEGRADE Alarms Automatic Laser Shutdown, ALS Full Current Parameter Monitoring 5 V Operation ...

Page 2

ADN2830–SPECIFICATIONS Parameter LASER BIAS (BIAS) Output Current IBIAS Compliance Voltage IBIAS during ALS ALS Response Time MONITOR PD (IMPD) Current Input Voltage POWER SET INPUT (PSET) Capacitance Input Current Voltage ALARM SET (ASET) Allowable Resistance Range Voltage Hysteresis LOGIC INPUTS ...

Page 3

... Lead Temperature (Soldering 10 sec 300°C Model ADN2830ACP32 ADN2830ACP32-REEL7 ADN2830ACP32-REEL CAUTION 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 ADN2830 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 4

ADN2830 Pin No. Mnemonic Function 1 GND Supply Ground 2 ASET Alarm Current Threshold Set Pin Connect 4 PSET Average Optical Power Set Pin 5 IMPD Monitor Photodiode Input 6 IMPDMON Mirrored Current from Monitor Photodiode—Current Source ...

Page 5

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

Page 6

ADN2830 POWER CONSUMPTION The ADN2830 die temperature must be kept below 125°C. The exposed paddle should be connected in such a manner that the same potential as the ADN2830 ground pins. Power consumption can be calculated using ...

Page 7

MPD CONNECT CONNECT Figure 3. Test Circuit, Second ADN2830 Used in Parallel Current Boosting Mode to Achieve 400 mA Max IBIAS REV FAIL DEGRADE ...

Page 8

ADN2830 MPD CONNECT NOTES 1.FOR DIGITAL CONTROL, REPLACE R ADN2850 10-BIT RESOLUTION, 35 ppm/ C TC, EEPROM; AD5242 8-BIT RESOLUTION, 30 ppm/ C TC. 2.TOTAL CURRENT TO LASER = IBIAS + ...

Page 9

CONNECT Figure 6. The ADN2830 Configured as a Controlled Current Source by Feeding Back the Bias Monitor Current to R REV FAIL DEGRADE ...

Page 10

ADN2830 PIN 1 INDICATOR 12 MAX 1.00 0.90 0.80 SEATING PLANE Revision History Location 6/03—Data Sheet changed from REV REV. A. Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . ...

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