MAX3735, MAX3735A：2.7Gbps, Low-Power SFP Laser Drivers

Multirate 3.3V Laser Driver for SFP Modules Meets All Requirements for SFF-8472 Digital Diagnostics

The MAX3735/MAX3735A are +3.3V laser drivers for SFP/SFF applications from 155Mbps up to 2.7Gbps. The devices accept differential input data and provide bias and modulation currents for driving a laser. DC-coupling to the laser allows for multirate applications and reduces the number of external components. The MAX3735/MAX3735A are fully compliant with the SFP MSA timing and the SFF-8472 transmit diagnostic requirements. An automatic power-control (APC) feedback loop is incorporated 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 MAX3735/MAX3735A provide transmit-disable control, a single-point latched transmit-failure monitor output, photocurrent monitoring, and bias-current monitoring to indicate when the APC loop is unable to maintain the average optical power. The MAX3735A also features improved multirate operation. The MAX3735/MAX3735A come in package and die form, and operate over the extended temperature range of -40°C to +85°C.

Key Features

SFP Reference Design Available
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 QFN package

MAX3735, MAX3735A: Typical Application Circuit

Applications/Uses

1G/2G Fibre Channel SFF/SFP Optical Transceiver Modules
Gigabit Ethernet SFF/SFP Transceiver Modules
Modules
Multirate OC-3 to OC-48 FEC SFF/SFP Transceiver Modules

DataSheet

title	Download file
MAX3735-MAX3735A Data Sheet	MAX3735-MAX3735A.pdf

Parametrics

Part Number	Target Oper. Range (Gbps)	Data Rate (Mbps)	Data Rate (Mbps)	V_SUPPLY (V)	I_CC (mA)	I/O Type	I_MOD (mA)	I_BIAS (mA)	Package/Pins	Budgetary Price
Part Number	Target Oper. Range (Gbps)	min	max	V_SUPPLY (V)	typ	I/O Type	max	max	Package/Pins	See Notes
MAX3735A	1 to 4.5	155	2700	3.3	27	CML	60	100	QFN/24 TQFN/24	$1.56 @1k

Design kits & evaluation modules

MAX3735AEVKIT

Quality and Environmental Data

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX3735AE/D	No Longer Available		DICE SALES,;NA pin;DICE S;	0°C to +70°C	See data sheet
MAX3735AEGG	No Longer Available	MAX3735AETG+	QFN,;24 pin;16 mm²	-40°C to +85°C	No
MAX3735AEGG-T	No Longer Available	MAX3735AETG+	QFN;24 pin	-40°C to +85°C	See data sheet
MAX3735AETG	No Longer Available	MAX3735AETG+	TQFN,;24 pin;16.8 mm²	-40°C to +85°C	No
MAX3735AETG+	Active		TQFN,;24 pin;16.8 mm²	-40°C to +85°C	Lead Free
MAX3735AETG+T	Active		TQFN,;24 pin;16.8 mm²	-40°C to +85°C	Lead Free
MAX3735AETG-T	No Longer Available	MAX3735AETG+T	QFN;24 pin	-40°C to +85°C	See data sheet
MAX3735E/D	No Longer Available		DICE SALES,;NA pin;DICE;	0°C to +70°C	See data sheet