MAX3735A datasheet(1/18 Pages) MAXIM

Part #	MAX3735A

Description	2.7Gbps, Low-Power SFP Laser Driver

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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General Description

The MAX3735A is a +3.3V laser driver for SFP/SFF appli-

cations from 155Mbps up to 2.7Gbps. The device accepts

differential input data and provides bias and modulation

currents for driving a laser. DC-coupling to the laser allows

for multirate applications and reduces the number of exter-

nal components. The MAX3735A is fully compliant with the

SFP MSA timing and the SFF-8472 transmit diagnostic

requirements.

An automatic power-control (APC) feedback loop is incor-

porated to maintain a constant average optical power over

temperature and lifetime. The wide modulation current

range of 10mA to 60mA (up to 85mA AC-coupled) and bias

current of 1mA to 100mA make this product ideal for driving

FP/DFB laser diodes in fiber-optic modules. The resistor

range for the laser current settings is optimized to interface

with the DS1858 SFP controller IC.

The MAX3735A provides transmit-disable control, a

single-point latched transmit-failure monitor output, photo-

current monitoring, and bias-current monitoring to indicate

when the APC loop is unable to maintain the average

optical power.

The MAX3735A is available in a 4mm x 4mm TQFN pack-

age and operates over the extended temperature range of

-40°C to +85°C.

Applications

● Gigabit Ethernet SFP/SFF Transceiver Modules

● 1G/2G Fibre Channel SFP/SFF Transceiver Modules

● Multirate OC3 to OC48-FEC SFP/SFF Transceiver

Modules

Features

● Fully Compliant with SFP and SFF-8472 MSAs

● Programmable Modulation Current from 10mA to

60mA (DC-Coupled)

● Programmable Modulation Current from 10mA to

85mA (AC-Coupled)

● Programmable Bias Current from 1mA to 100mA

● Edge Transition Times <51ps

● 27mA (typ) Power-Supply Current

● Multirate 155Mbps to 2.7Gbps Operation

● Automatic Average Power Control

● On-Chip Pullup Resistor for TX_DISABLE

● 24-Pin 4mm x 4mm TQFN package

19-2529; Rev 4; 1/13

Ordering Information appears at end of data sheet.

IN+

0.1µF

MD

BIAS

OUT+

OUT-

OPTIONAL SHUTDOWN

CIRCUITRY

IN-

REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE

SERDES

MAX3735A

0.1µF

+3.3V

CMD

FERRITE BEAD

+3.3V

10Ω

RBC_MON

RPC_MON

15Ω

0.01µF

DS1858/DS1859

CONTROLLER

IC

CAPC

M0N2

M0N3

MON1

H1

H0

+3.3V

MAX3735A

2.7Gbps, Low-Power SFP Laser Driver

Typical Application Circuit

EVALUATION KIT AVAILABLE

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