ADN2847ACP-32 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADN2847ACP-32

3 V Dual-Loop 50 Mbps to 3.3 Gbps Laser Diode Driver

Analog Devices 

ADN2847

ALS

1k⍀

VCC

VCC

*

1.5k⍀

1.5k⍀

*

*

36

25

*

*

FAIL

DEGRADE

*

VCC

37

GND2

VCC2

IMODN

MPD

LD

*

*

*

*

IMODN

GND2

IMODP

IMODP

GND2

GND2

1␮H

IBIAS

IBIAS

CCBIAS

48

ADN2847

24

GND

GND

GND

CLKN

CLKP

10nF

10nF

CLKN

CLKP

GND1

DATAP

DATAN

10nF

10nF

DATAP

DATAN

GND1

VCC1

GND

PAVCAP

ERCAP

1␮F

1␮F

13

1

LD = LASER DIODE

MPD = MONITOR PHOTODIODE

** **

1.5k⍀

12

VCCs SHOULD HAVE BYPASS CAPACITORS AS

CLOSE AS POSSIBLE TO THE ACTUAL SUPPLY PINS

ON THE ADN2847 AND THE LASER DIODE USED.

CONSERVATIVE DECOUPLING WOULD INCLUDE

100pF CAPACITORS IN PARALLEL WITH 10nF

CAPACITORS.

VCC

100nF 100nF 100nF 100nF 10␮F

GND

NOTES

* DESIGNATES COMPONENTS THAT NEED TO BE OPTIMIZED FOR THE TYPE OF LASER USED

**FOR DIGITAL PROGRAMMING,THE ADN2850 OR THE ADN2860 OPTICAL SUPERVISOR CAN BE USED.

Figure 12. AC-Coupled 50 Mbps to 3.3 Gbps Test Circuit, Data Not Clocked

Figure 13. A 2.5 Gbps Optical Eye at 25°C. Average

Power = 0 dBm, Extinction Ratio = 10 dB, PRBS 31

Pattern. Eye Obtained Using a DFB Laser.

Figure 14. A 2.5 Gbps Optical Eye at 85°C. Average

Power = 0 dBm, Extinction Ratio = 10 dB, PRBS 31

Pattern. Eye Obtained Using a DFB Laser.

–10–

REV. 0

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