REV. A

ADN2830

–8–

NC

NC

GND1

NC

PAVCAP

PAVCAP

NC

GND2

IBIAS

GND2

GND2

IBIAS

NC

18

16

24

32

NC = NO CONNECT

MPD

LD

FAIL

DEGRADE

100nF

10 F

GND

PLACE 100nF CAP

CLOSE TO PIN 8

ADN2830

R1

R2

NOTES

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

NC

NC

GND1

NC

PAVCAP

PAVCAP

NC

GND2

IBIAS

GND2

GND2

IBIAS

NC

18

16

24

32

NC = NO CONNECT

FAIL

DEGRADE

100nF

10 F

GND

PLACE 100nF CAP

CLOSE TO PIN 8

ADN2830

R1

AD820

MPD

LD

R2

CURRENT GAIN =

R1

R2

Figure 5. The ADN2830 Configured as Average Power Controller (Bias Current Sourced)