ADN2848ACP-32 Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Fabricante

ADN2848ACP-32

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

Analog Devices 

ADN2848

VCC

ALS

*

1k⍀

*

*

*

*

1.5k⍀

1.5k⍀

24

17

FAIL

DEGRADE

*

VCC

MPD

LD

*

*

*

*

10␮H

25

VCC2

IMODN

GND2

IMODP

GND2

GND2

IBIAS

CCBIAS

32

1

ADN2848

** **

1.5k⍀

16

CLKN

10nF

CLKN

CLKP

GND1

DATAP

10nF

10nF

CLKP

DATAP

DATAN

VCC1

PAVCAP

10nF

1␮F

DATAN

ERCAP

9 1␮F

VCCs SHOULD HAVE BYPASS CAPACITORS AS CLOSE

AS POSSIBLE TO THE ACTUAL SUPPLY PINS ON THE

8

ADN2848 AND THE LASER DIODE USED.

CONSERVATIVE DECOUPLING WOULD INCLUDE 100pF

CAPACITORS IN PARALLEL WITH 10nF CAPACITORS.

VCC

LD = LASER DIODE

MPD = MONITOR PHOTODIODE

10nF

10nF

10nF 10nF 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 7. AC-Coupled 50 Mbps to 1.25 Gbps Test Circuit, Data Not Clocked

Figure 8. A 1.244 Mbps Optical Eye. Temperature at 25ЊC.

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

31 Pattern, 1 Gb Ethernet Mask. Eye Obtained Using a

DFB Laser.

Figure 9. A 1.244 Mbps Optical Eye. Temperature at 85ЊC.

Average Power = 0 dBm, Extinction Ratio = 10 dBm, PRBS

31 Pattern, 1 Gb Ethernet Mask. Eye Obtained Using a

DFB Laser.

–8–

REV. 0

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