MAX3286CSLASHD datasheet(9/28 Pages) MAXIM

9 / 28 page

3.0V to 5.5V, 1.25Gbps/2.5Gbps

LAN Laser Drivers

_______________________________________________________________________________________

SMOOTH-

START

IN+

IN-

MODSET

RMOD

VCC

RTC

MON

SHDNDRV

REF

POR

PORDLY

POL

FAULT

FLTDLY

1.97V

1.53V

+1.7V

50Ω

CONTROLLED

REFERENCE

GENERATOR

LASER

MODULATOR

MODULATION CURRENT

GENERATOR

1.7V

REF

BIASDRV

OUT-

OUT+

POR CIRCUIT

SAFETY

CIRCUITRY

INPUT BUFFER

VCC - 0.54V

MAX3286

MAX3296

BIAS GENERATOR

Figure 2b. Laser Driver Functional Diagram

LASER

MODULATOR

POR CIRCUIT

SAFETY

BIAS GENERATOR

MODSET

BIASDRV

SHDNDRV

FAULT

POR

PORDLY

FLTDLY

POL

MON

OUT-

OUT+

REF

IN+

IN-

Figure 2a. Simplified Laser Driver Functional Diagram

the anode or cathode of a monitor photodiode or to a

resistor-divider, depending on the specific application

circuit. Three application circuits are supported:

common-cathode laser with photodiode, common-

cathode laser without photodiode, and common-anode

laser with photodiode (as shown in the Design Procedure

section). The POL and POL inputs determine the laser

pinning (common cathode, common anode) (Table 4).

The smooth-start circuitry prevents current spikes to the

laser during power-up or enable; this ensures compliance

with safety requirements and extends the life of the laser.

The power-control amplifier drives an external transistor

to control the laser bias current. In a fault condition, the

power-control amplifier’s output is disabled (high

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