Datasheet
REV.
ADN2830
–8–
GND
ASET
NC
PSET
IMPD
IMPDMON
GND4
V
CC
4
NC
NC
GND1
NC
V
CC
5
V
CC
1
PAVCAP
PAVCAP
V
CC
2
NC
GND2
IBIAS
GND2
GND2
IBIAS
NC
IBMON
IBMON
GND3
V
CC
3
ALS
FAIL
DEGRADE
MODE
18
16
24
32
NC = NO CONNECT
MPD
LD
V
CC
V
CC
FAIL
DEGRADE
100nF 10F
V
CC
GND
PLACE 100nF CAP
CLOSE TO PIN 8
ADN2830
R1R2
V
CC
NOTES
1.FOR DIGITAL CONTROL, REPLACE R
PSET
WITH A DIGITAL POTENTIOMETER FROM ANALOG DEVICES:
ADN2850 10-BIT RESOLUTION, 35 ppm/C TC, EEPROM; AD5242 8-BIT RESOLUTION, 30 ppm/C TC.
2.TOTAL CURRENT TO LASER = IBIAS + IBIAS R1/R2.
3.FOR BEST ACCURACY, SIZE R1 TO HAVE A MAXIMUM VOLTAGE DROP ACROSS IT WITHIN THE HEADROOM
CONSTRAINTS.
4.FOR 250 mA EXTRA IBIAS (450 mA TOTAL) FROM AMP1, USE AD8591 AMPLIFIER. AMP1 IS THE OPERATIONAL AMPLIFIER
SHOWN IN THIS FIGURE.
5.FOR 350 mA EXTRA IBIAS (550 mA TOTAL) FROM AMP1, USE ANALOG DEVICES’ SSM2211 AMPLIFIER. AMP1 IS THE
OPERATIONAL AMPLIFIER SHOWN IN THIS FIGURE.
Figure 4. The ADN2830 Configured with Current Multiplier
GND
ASET
NC
PSET
IMPD
IMPDMON
GND4
V
CC
4
NC
NC
GND1
NC
V
CC
5
V
CC
1
PAVCAP
PAVCAP
V
CC
2
NC
GND2
IBIAS
GND2
GND2
IBIAS
NC
IBMON
IBMON
GND3
V
CC
3
ALS
FAIL
DEGRADE
MODE
18
16
24
32
NC = NO CONNECT
V
CC
V
CC
FAIL
DEGRADE
100nF 10F
V
CC
GND
PLACE 100nF CAP
CLOSE TO PIN 8
ADN2830
R1
V
CC
AD820
MPD
V
CC
LD
V
CC
R2
CURRENT GAIN =
R1
R2
Figure 5. The ADN2830 Configured as Average Power Controller (Bias Current Sourced)
B