MAX3261CCJ

MAX3261CCJ Datasheet

The MAX3261 is a complete, easy-to-program, single +5V-powered, 1.25Gbps laser diode driver with complementary enable inputs and automatic power control APC . The MAX3261 accepts differential PECL inputs and provides complementary output currents. A temperature-stabilized reference voltage is provided to simplify laser current programming. This allows modulation current to be programmed up to 30mA and bias current to be programmed up to 60mA with two external resistors.

Part	Datasheet
MAX3261CCJ	MAX3261CCJ (pdf)

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Single +5V, Fully Integrated, 1.25Gbps Laser Diode Driver The MAX3261 is a complete, easy-to-program, single +5V-powered, 1.25Gbps laser diode driver with complementary enable inputs and automatic power control APC . The MAX3261 accepts differential PECL inputs and provides complementary output currents. A temperature-stabilized reference voltage is provided to simplify laser current programming. This allows modulation current to be programmed up to 30mA and bias current to be programmed up to 60mA with two external resistors. Complementary enable inputs allow the MAX3261 to interface with open-fiber-control feature not found in other 1.25Gbps laser diode drivers. An APC circuit is provided to maintain constant laser power in transmitters that use a monitor photodiode. Only two external components are required to implement the APC function. The MAX3261’s fully integrated feature set includes a TTL-compatible laser failure indicator and a programmable slow-start circuit to prevent laser damage. The slow-start is preset to 50ns and can be extended by adding an external capacitor. Laser Diode Transmitters 531Mbps and 1062Mbps Fibre Channel 622Mbps SDH/SONET Gigabit Ethernet Configuration TOP VIEW GNDA OUT- GNDA OUT+ GNDA VCCA VCCA VCCA GNDA GNDA IPIN SLWSTRT GNDB VREF2 IPINSET FAILOUT MAX3261 IBIASOUT IMODSET IBIASSET IBIASFB OSADJ VREF1 VCCB ENB+ o Rise Times Less than 250ps o Differential PECL Inputs o Single +5V Supply o Automatic Power Control o Temperature-Compensated Reference Voltage o Complementary Enable Inputs Ordering Information PART MAX3261CCJ MAX3261ECJ MAX3261E/D TEMP. RANGE 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 32 TQFP 32 TQFP Dice* *Dice are designed to operate over a -40°C to +140°C junction temperature Tj range. Tested and guaranteed at Tj = +25°C. Operating Circuit VCCA VCCB VIN+ PECL INPUTS VIN- GND A GND B OUT+ ENB+ TO OPEN FIBER CONTROL ENB- MAX3261 IPIN IBIASOUT SLWSTRT OUT- VREF1 FAILOUT VREF2 IBIASFB IMODSET IBIASSET OSADJ IPINSET PHOTODIODE LASER ZO = MICROSTRIP +5V 2.7k ENB- VCCB VCCB GNDB VIN- GNDB VIN+ GNDB TQFP Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at Single +5V, Fully Integrated, 1.25Gbps Laser Diode Driver MAX3261 ABSOLUTE MAXIMUM RATINGS Terminal Voltage with respect to GND Supply Voltages VCCA, VCCB ...............................-0.3V to 6V VIN+, VIN-, to VCC_ OUT+, OUT-, IBIASOUT to VCC_ ENB+, ENB- .......................VCC_ or 5.5V, whichever is smaller Differential Input Voltage \|VIN+ - VIN-\| ...........................3.8V Input Current IBIASOUT to 75mA OUT+, OUT- to 40mA IBIASSET to 1.875mA to 2mA IPIN, IPINSET, to 2mA to 10mA to 2mA Output Current VREF1, to 20mA SLWSTRT to 5mA Continuous Power Dissipation TA = +70°C TQFP derate 10.2mW/°C above +70°C ......................816mW Operating Temperature Ranges MAX3261CCJ to +70°C MAX3261ECJ to +85°C Junction Temperature Storage Temperature Range .............................-55°C to +175°C Processing Temperature die Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS VCC = VCCA = VCCB = +4.75V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C. Note 1 PARAMETER CONDITIONS MIN TYP MAX UNITS Range of Programmable Laser Bias Current IBIAS Reference Voltage Available Reference Current Supply Current VREF IREF IVCC TA = +25°C Note 2 PECL Input High VCC - PECL Input Low VCC - TTL Input High TTL Input Low FAILOUT Output High VOH Loaded with pull-up resistor to VCC FAILOUT Output Low VOL Loaded with pull-up resistor to VCC Note 1 Dice are tested at TA = +25°C. Note 2 IVCC = IVCCA + IVCCB, IBIAS = 60mA, IMOD = 30mA, and IPIN = 140µA.

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Single +5V, Fully Integrated, 1.25Gbps Laser Diode Driver

The MAX3261 is a complete, easy-to-program, single +5V-powered, 1.25Gbps laser diode driver with complementary enable inputs and automatic power control APC . The MAX3261 accepts differential PECL inputs and provides complementary output currents. A temperature-stabilized reference voltage is provided to simplify laser current programming. This allows modulation current to be programmed up to 30mA and bias current to be programmed up to 60mA with two external resistors.

Complementary enable inputs allow the MAX3261 to interface with open-fiber-control feature not found in other 1.25Gbps laser diode drivers.

An APC circuit is provided to maintain constant laser power in transmitters that use a monitor photodiode. Only two external components are required to implement the APC function.

The MAX3261’s fully integrated feature set includes a TTL-compatible laser failure indicator and a programmable slow-start circuit to prevent laser damage. The slow-start is preset to 50ns and can be extended by adding an external capacitor.

Laser Diode Transmitters
531Mbps and 1062Mbps Fibre Channel
622Mbps SDH/SONET

Gigabit Ethernet

Configuration

TOP VIEW

GNDA

OUT-

GNDA

OUT+

GNDA

VCCA

VCCA

VCCA

GNDA

GNDA

IPIN

SLWSTRT

GNDB

VREF2

IPINSET

FAILOUT

MAX3261

IBIASOUT

IMODSET

IBIASSET

IBIASFB

OSADJ

VREF1

VCCB

ENB+
o Rise Times Less than 250ps o Differential PECL Inputs o Single +5V Supply o Automatic Power Control o Temperature-Compensated Reference Voltage o Complementary Enable Inputs
Ordering Information

PART MAX3261CCJ MAX3261ECJ MAX3261E/D

TEMP. RANGE 0°C to +70°C -40°C to +85°C -40°C to +85°C

PIN-PACKAGE 32 TQFP 32 TQFP Dice*
*Dice are designed to operate over a -40°C to +140°C junction temperature Tj range. Tested and guaranteed at Tj = +25°C.

Operating Circuit

VCCA VCCB VIN+ PECL INPUTS VIN-

GND A

GND B

OUT+

ENB+ TO OPEN

FIBER CONTROL

ENB-

MAX3261 IPIN

IBIASOUT

SLWSTRT

OUT-

VREF1

FAILOUT

VREF2

IBIASFB

IMODSET IBIASSET

OSADJ

IPINSET

PHOTODIODE

LASER

ZO = MICROSTRIP
+5V 2.7k

ENB-

VCCB

VCCB

GNDB

VIN-

GNDB

VIN+

GNDB

TQFP

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at

Single +5V, Fully Integrated, 1.25Gbps Laser Diode Driver

MAX3261

ABSOLUTE MAXIMUM RATINGS

Terminal Voltage with respect to GND

Supply Voltages VCCA, VCCB ...............................-0.3V to 6V VIN+, VIN-, to VCC_ OUT+, OUT-, IBIASOUT to VCC_ ENB+, ENB- .......................VCC_ or 5.5V, whichever is smaller

Differential Input Voltage |VIN+ - VIN-| ...........................3.8V

Input Current

IBIASOUT to 75mA

OUT+, OUT- to 40mA

IBIASSET to 1.875mA
to 2mA

IPIN, IPINSET, to 2mA
to 10mA
to 2mA

Output Current VREF1, to 20mA SLWSTRT to 5mA

Continuous Power Dissipation TA = +70°C TQFP derate 10.2mW/°C above +70°C ......................816mW

Operating Temperature Ranges MAX3261CCJ to +70°C MAX3261ECJ to +85°C

Junction Temperature Storage Temperature Range .............................-55°C to +175°C Processing Temperature die

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICS

VCC = VCCA = VCCB = +4.75V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C. Note 1

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Range of Programmable Laser Bias Current

IBIAS

Reference Voltage Available Reference Current Supply Current

VREF IREF IVCC

TA = +25°C Note 2

PECL Input High

VCC -

PECL Input Low

VCC -

TTL Input High

TTL Input Low

FAILOUT Output High

VOH Loaded with pull-up resistor to VCC

FAILOUT Output Low

VOL Loaded with pull-up resistor to VCC

Note 1 Dice are tested at TA = +25°C. Note 2 IVCC = IVCCA + IVCCB, IBIAS = 60mA, IMOD = 30mA, and IPIN = 140µA.

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Datasheet ID: MAX3261CCJ 647296