MAX3286 Ver la hoja de datos (PDF) - Maxim Integrated

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componentes Descripción

Fabricante

MAX3286

3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers

Maxim Integrated 

3.0V to 5.5V, 1.25Gbps/2.5Gbps

LAN Laser Drivers

VCC

ICC

IOUT

VCC

OUT-

MAX3286 VCC

MAX3296

50Ω

FERRITE BEAD*

0.01µF

OUT+

0.01µF

VCC

L = 3.9nH

50Ω

iMOD

RL 25Ω

IN+

VID

IN-

*MURATA

BLM11HA102

MODSET MODULATION

CONTROL

RMOD TC

BIASDRV

(OPEN)

IMOD3/2

LASER

EQUIVALENT

LOAD

L = 3.9nH

RL = 25Ω

VOLTS

VIN+

VIN-

VID = VIN+ - VIN-

CURRENT

IMOD

DIFFERENTIAL INPUT

RESULTING SIGNAL

TIME

100mVP-P MIN

830mVP-P MAX

200mVP-P MIN

1660mVP-P MAX

Figure 1a. Output Load for AC Specification

VCC

tPORDLY

POR

FAULT

SHDNDRV

tFAULT

tRESET

tSHUTDN

OPTICAL

OUT

EN

tEN_RESET

FAULT ON MD RESET BY EN SHUTDOWN

BY EN

NOTE: TIMING IS NOT TO SCALE.

Figure 1b. Fault Timing

_______________Detailed Description

The MAX3286/MAX3296 series of laser drivers contain a

bias generator with APC, laser modulator, power-on reset

(POR) circuit, and safety circuitry (Figures 2a and 2b).

Bias Generator

Figure 3 shows the bias generator circuitry containing a

power-control amplifier, controlled reference voltage,

smooth-start circuit, and window comparator. The bias

generator combined with an external PNP or NPN transis-

tor provides DC laser current to bias the laser in a light-

emitting state. When there is a monitor diode (MD) in the

laser package, the APC circuitry adjusts the laser-bias

current to maintain average power over temperature and

changing laser properties. The MD input is connected to

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