MAX3286CSLASHD datasheet(8/28 Pages) MAXIM

8 / 28 page

3.0V to 5.5V, 1.25Gbps/2.5Gbps

LAN Laser Drivers

_______________________________________________________________________________________

MODULATION

CONTROL

MODSET

L = 3.9nH

RL = 25Ω

BIASDRV

LASER

EQUIVALENT

LOAD

(OPEN)

OUT-

OUT+

FERRITE BEAD*

*MURATA

BLM11HA102

0.01µF

IN+

IN-

50Ω

25Ω

RMOD

VCC

IOUT

ICC

VCC

IMOD3/2

iMOD

VID

VID = VIN+ - VIN-

CURRENT

IMOD

VIN-

VIN+

VOLTS

TIME

100mVP-P MIN

830mVP-P MAX

200mVP-P MIN

1660mVP-P MAX

DIFFERENTIAL INPUT

RESULTING SIGNAL

MAX3286

MAX3296

Figure 1a. Output Load for AC Specification

VCC

POR

FAULT

FAULT ON MD

RESET BY EN SHUTDOWN

BY EN

SHDNDRV

OPTICAL

OUT

NOTE: TIMING IS NOT TO SCALE.

tPORDLY

tFAULT

tRESET

tSHUTDN

tEN_RESET

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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