MAX3261CCJ ,Single +5V / Fully Integrated / 1.25Gbps Laser Diode DriverApplicationsLaser Diode Transmitters531Mbps and 1062Mbps Fibre Channel +5V +5V622Mbps SDH/SONET+5VG ..
MAX3262CAG ,1Gbps, high-speed limiting amplifier with catter-free loss-of-signal detection.Applications AMAX3262C/D 0°C to +100°C (T ) Dice*J1062Mbps Fibre Channel*Dice are designed to opera ..
MAX3263CAG ,Single +5V / Fully Integrated / 155Mbps Laser Diode DriverMAX326319-0432; Rev 1b; 4/98Single +5V, Fully Integrated,155Mbps Laser Diode Driver________________
MAX3263CAG+ ,Single +5V / Fully Integrated / 155Mbps Laser Diode DriverFeaturesThe MAX3263 is a complete, easy-to-program, single♦ Rise Times Less than 1ns+5V-powered, 15 ..
MAX3264CUE ,3.0V to 5.5V / 1.25Gbps/2.5Gbps Limiting AmplifiersFeaturesThe 1.25Gbps MAX3264/MAX3268 and the 2.5Gbps +3.0V to +5.5V Supply VoltageMAX3265/MAX3269 ..
MAX3265 ,+3.0V to +5.5V, 1.25Gbps/2.5Gbps Limiting AmplifiersFeaturesThe 1.25Gbps MAX3264/MAX3268/MAX3768 and the ♦ +3.0V to +5.5V Supply Voltage2.5Gbps MAX3265 ..
MAX691CWE ,Microprocessor Supervisory Circuits19-02 18; He V 2; 4/95
MAX691CWE ,Microprocessor Supervisory CircuitsELECTRICAL CHARACTERISTICS
(Vcc = full operating range, VBATT = 2.8V, T, = 25°C, unless otherwis ..
MAX691CWE ,Microprocessor Supervisory Circuits19-02 18; He V 2; 4/95
MAX691CWE ,Microprocessor Supervisory CircuitsELECTRICAL CHARACTERISTICS
(Vcc = full operating range, VBATT = 2.8V, T, = 25°C, unless otherwis ..
MAX691CWE ,Microprocessor Supervisory CircuitsFeatures
. Precision Voltage Monitor
4.65V in MAX690, MAX691, MAX694 and MAX695
4.40V in MAX69 ..
MAX691CWE+ ,Microprocessor Supervisory CircuitsElectrical CharacteristicsV = full operating range, V = 2.8V, T = +25°C, unless otherwise noted.)CC ..
MAX3261CCJ
Single +5V / Fully Integrated / 1.25Gbps Laser Diode Driver
_______________General DescriptionThe MAX3261 is a complete, easy-to-program, single
+5V-powered, 1.25Gbps laser diode driver with com-
plementary enable inputs and automatic power control
(APC). The MAX3261 accepts differential PECL inputs
and provides complementary output currents. A tem-
perature-stabilized reference voltage is provided to
simplify laser current programming. This allows modu-
lation current to be programmed up to 30mA and bias
current to be programmed up to 60mA with two exter-
nal resistors.
Complementary enable inputs allow the MAX3261 to
interface with open-fiber-control architecture—a 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 program-
mable slow-start circuit to prevent laser damage. The
slow-start is preset to 50ns and can be extended by
adding an external capacitor.
________________________ApplicationsLaser Diode Transmitters
531Mbps and 1062Mbps Fibre Channel
622Mbps SDH/SONET
Gigabit Ethernet
____________________________FeaturesRise Times Less than 250psDifferential PECL InputsSingle +5V SupplyAutomatic Power ControlTemperature-Compensated Reference VoltageComplementary Enable Inputs
______________Ordering Information
MAX3261
Single +5V, Fully Integrated,
1.25Gbps Laser Diode Driver
__________________Pin Configuration19-0323; Rev 4; 8/97
__________Typical Operating Circuit*Dice are designed to operate over a -40°C to +140°C junction
temperature (Tj) range. Tested and guaranteed at Tj = +25°C.
MAX3261
Single +5V, Fully Integrated,
1.25Gbps Laser Diode Driver
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= VCCA = VCCB = +4.75V to +5.25V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and = +25°C.) (Note 1)
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.
Terminal Voltage (with respect to GND)
Supply Voltages (VCCA, VCCB)...............................-0.3V to 6V
VIN+, VIN-, FAILOUT...............................................0V to VCC_
OUT+, OUT-, IBIASOUT.......................................1.5V to VCC_
ENB+, ENB-.......................VCC_or 5.5V, whichever is smaller
Differential Input Voltage (|VIN+ - VIN-|)...........................3.8V
Input Current
IBIASOUT............................................................0mA to 75mA
OUT+, OUT-........................................................0mA to 40mA
IBIASSET........................................................0mA to 1.875mA
IMODSET...............................................................0mA to 2mA
IPIN, IPINSET, OSADJ...........................................0mA to 2mA
FAILOUT..............................................................0mA to 10mA
IBIASFB................................................................-2mA to 2mA
Output Current
VREF1, VREF2.....................................................0mA to 20mA
SLWSTRT..............................................................0mA to 5mA
Continuous Power Dissipation (TA= +70°C)
TQFP (derate 10.2mW/°C above +70°C)......................816mW
Operating Temperature Ranges
MAX3261CCJ......................................................0°C to +70°C
MAX3261ECJ...................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-55°C to +175°C
Processing Temperature (die).........................................+400°C
AC ELECTRICAL CHARACTERISTICS(VCC= VCCA = VCCB = +4.75V to +5.25V, RLOAD(at OUT+ and OUT-) = 25Wconnected to VCC, TA= -40°C to +85°C, unless other-
wise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 3)
Note 1:Dice are tested at TA= +25°C.
Note 2:IVCC= IVCCA + IVCCB, IBIAS= 60mA, IMOD= 30mA, and IPIN= 140mA.
Note 3:AC characteristics are guaranteed by design and characterization.
Note 4:An 1100mVp-p differential is equivalent to complementary 550mVp-p signals on VIN+ and VIN-.
MAX3261
Single +5V, Fully Integrated,
1.25Gbps Laser Diode Driver
__________________________________________Typical Operating Characteristics(MAX3261E/D, load at OUT+ and OUT- = 25Ω, VCC= VCCA = VCCB = +5V, TA= +25°C, unless otherwise noted.)
MAX3261
Single +5V, Fully Integrated,
1.25Gbps Laser Diode Driver
____________________________Typical Operating Characteristics (continued)(MAX3261E/D, LOAD at OUT+ = OUT-= 25Ω, VCC= VCCA = VCCB = +5V, TA = +25°C, unless otherwise noted.)
MAX3261
Single +5V, Fully Integrated,
1.25Gbps Laser Diode Driver
______________________________________________________________Pin Description
MAX3261
Single +5V, Fully Integrated,
1.25Gbps Laser Diode Driver
_______________Detailed DescriptionThe MAX3261 laser driver has three main sections: a
reference generator with temperature compensation, a
laser bias block with automatic power control, and a
high-speed modulation driver.
The reference generator provides temperature-com-
pensated biasing and a voltage-reference output. The
voltage reference is used to program the current levels
of the high-speed modulation driver, laser diode, and
PIN (p+, intrinsic, n-) monitor diode.
The laser bias block sets the bias current in the laser diode
and maintains it above the threshold current. A current-con-
trolled current source (current mirror) programs the bias,
with IBIASSET as the input. The mirror’s gain is approxi-
mately 40. Keep the output voltage of the bias stage above
2.2V to prevent saturation.
The modulation driver consists of a high-speed input
buffer and a common-emitter differential output stage. The
modulation current mirror sets the laser modulation current
in the output stage. This current is switched between the
OUT+ and OUT- ports of the laser driver. The modulation
Figure 1. Functional Diagram
