MAX3263CAG-MAX3263CAG+ Fast Delivery |IC PHOENIX CO.,LIMITED

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 ..
MAX3265CUB ,3.0V to 5.5V / 1.25Gbps/2.5Gbps Limiting AmplifiersMAX3264/MAX3265/MAX3268/MAX326919-1523; Rev 1; 1/003.0V to 5.5V, 1.25Gbps/2.5Gbps Limiting Amplifie ..
MAX3265CUB+T ,+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 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 ..
MAX691CWE+T ,Microprocessor Supervisory CircuitsMAX690–MAX695 Microprocessor Supervisory Circuits

MAX3263CAG-MAX3263CAG+
Single +5V / Fully Integrated / 155Mbps Laser Diode Driver
________________General Description
The MAX3263 is a complete, easy-to-program, single
+5V-powered, 155Mbps laser diode driver with com-
plementary enable inputs and automatic power control
(APC). The MAX3263 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 from up to 60mA with two
external resistors.
An APC circuit is provided to maintain constant laser
power in transmitters that use a monitor photodiode.
Only two external resistors are required to implement
the APC function.
The MAX3263’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.
________________________Applications
Laser Diode Transmitters
155Mbps SDH/SONET
155Mbps ATM
____________________________FeaturesRise Times Less than 1nsDifferential PECL InputsSingle +5V SupplyAutomatic Power ControlTemperature-Compensated Reference VoltageComplementary Enable Inputs
_______________Ordering Information
MAX3263
Single +5V, Fully Integrated,
155Mbps Laser Diode Driver
___________________Pin Configuration
19-0432; Rev 1b; 4/98
MAX3263
Single +5V, Fully Integrated,
155Mbps Laser Diode Driver
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.
ABSOLUTE MAXIMUM RATINGS
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-......................VCCor +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)
SSOP (derate 8mW/°C above +70°C)..........................640mW
Operating Temperature Range...............................0°C to +70°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-55°C to +175°C
DC ELECTRICAL CHARACTERISTICS
(VCC= VCCA = VCCB = +4.75V to +5.25V, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +5V and = +25°C.)
AC ELECTRICAL CHARACTERISTICS
(VCC= VCCA = VCCB = +4.75V to +5.25V, RLOAD(at OUT+ and OUT-) = 25Wconnected to VCC, TA= 0°C to +70°C, unless other-
wise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 2)
Note 2:AC characteristics are guaranteed by design and characterization.
Note 3:An 1100mVp-p differential is equivalent to complementary 550mVp-p signals on VIN+ and VIN-.
Note 1:IVCC= IVCCA+ IVCCB, IBIAS= 60mA, IMOD= 30mA, and IPIN= 140μA.
MAX3263
Single +5V, Fully Integrated,
155Mbps Laser Diode Driver
RBIASSET vs. BIAS CURRENT
MAX3263-01
IBIAS (mA)
BIASSET
(k510152025
RMODSET vs. MODULATION CURRENT
MAX3263-02
MODULATION CURRENT (mAp-p)
MODSET
(k
RPINSET vs. MONITOR CURRENT
MAX3263-03
MONITOR CURRENT (μA)
PINSET
10,000
100,000
1,000,000
PERCENT CHANGE IN MODULATION
CURRENT vs. TEMPERATURE
MAX3263-04
TEMPERATURE (°C)
% CHANGE (w.r.t. +25°C)60
PERCENT CHANGE IN BIAS
CURRENT vs. TEMPERATURE
MAX3263-05
TEMPERATURE (°C)
% CHANGE (w.r.t. +25°C)6010307050
SUPPLY CURRENT
vs. TEMPERATURE
MAX3263-06
TEMPERATURE (°C)
SUPPLY CURRENT (mA)60510152025
ALLOWABLE ROSADJ RANGE
vs. MODULATION CURRENT
MAX3263-07
MODULATION CURRENT (mAp-p)
ALLOWABLE R
OSADJ
(k40080012001600
MAXIMUM MODULATION CURRENT
vs. MINIMUM DIFFERENTIAL
INPUT SIGNAL AMPLITUDE
MAX3263-08
MINIMUM DIFFERENTIAL
INPUT SIGNAL AMPLITUDE (mVp-p)
MAXIMUM MODULATION CURRENT
(mAp-p)
__________________________________________Typical Operating Characteristics
(MAX3263CAG loads at OUT+ and OUT- = 25Ω, VCC= VCCA = VCCB = +5V, TA= +25°C, unless otherwise noted.)
MAX3263
Single +5V, Fully Integrated,
155Mbps Laser Diode Driver
______________________________________________________________Pin Description
MAX3263
Single +5V, Fully Integrated,
155Mbps Laser Diode Driver
_______________Detailed Description
The MAX3263 laser driver has three main sections: a
reference generator with temperature compensation, a
laser bias block with automatic power control, and a
modulation driver (Figure 1).
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-controlled current source (current mirror) pro-
grams the bias, with IBIASSET as the input. The mirror’s
gain is approximately 40 over the MAX3263’s input
range. 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 current mirror has a gain of approximately
20. Keep the voltages at OUT+ and OUT- above 2.2V to
prevent saturation.
Figure 1. Functional Diagram
The overshoot mirror sets the bias in the input buffer
stage (Figure 2). Reducing this current slows the input
stage and reduces overshoot in the modulation signal.
At the same time, the peak-to-peak output swing of the
input buffer stage is reduced. Careful design must be
used to ensure that the buffer stage can switch the out-
put stage completely into the nonlinear region. The
input swing required to completely switch the output
stage depends on both ROSADJand the modulation
current. See Allowable ROSADJRange vs. Modulation
Current and Maximum Modulation Current vs. Minimum
Differential Input Signal Amplitude graphs in the Typical
Operating Characteristics. For the output stage, the
width of the linear region is a function of the desired
modulation current. Increasing the modulation current
increases the linear region. Therefore, increases in the
modulation current require larger output levels from the
first stage.
Failure to ensure that the output stage switches com-
pletely results in a loss of modulation current (and
extinction ratio). In addition, if the modulation port does
not switch completely off, the modulation current will
contribute to the bias current, and may complicate
module assembly.
Automatic Power Control
The automatic power control (APC) feature allows an
optical transmitter to maintain constant power, despite
changes in laser efficiency with temperature or age. The
APC requires the use of a monitor photodiode.
The APC circuit incorporates the laser diode, the monitor
photodiode, the pin set current mirror, a transconduc-
tance amplifier, the bias set current mirror, and the laser
fail comparator (Figure 1). Light produced by the laser
diode generates an average current in the monitor pho-
todiode. This current flows into the MAX3263’s IPIN
input. The IPINSET current mirror draws current away
from the IPIN node. When the current into the IPIN node
equals the current drawn away by IPINSET, the node
voltage is set by the VCCx 3/5 reference of the transcon-
ductance amplifier. When the monitor current exceeds
IPINSET, the IPIN node voltage will be forced higher. If
the monitor current decreases, the IPIN node voltage is
decreased. In either case, the voltage change is ampli-
fied by the transconductance amplifier, and results in a
feedback current at the IBIASFB node. Under normal
APC operation, IBIASFB is summed with IBIASSET, and
the laser bias level is adjusted to maintain constant out-
put power. This feedback process continues until the
monitor-diode current equals IPINSET.
If the monitor-diode current is sufficiently less than IPIN-
SET (i.e., the laser stops functioning), the voltage on the
IPIN node drops below 2.6V. This triggers the failout
comparator, which provides a TTL signal indicating laser
failure. The FAILOUT output asserts only if the monitor-
diode current is low, not in the reverse situation where
the monitor current exceeds IPINSET. FAILOUT is an
open-collector output that requires an external pull-up
resistor of 2.7kΩto VCC.
The transconductance amplifier can source or sink cur-
rents up to approximately 1mA. Since the laser bias gen-
erator has a gain of approximately 40, the APC function
has a limit of approximately 40mA (up or down) from the
initial set point. To take full advantage of this adjustment
range, it may be prudent to program the laser bias cur-
rent slightly higher than required for normal operation.
However, do not exceed the IBIASOUTabsolute maxi-
mum rating of 75mA.
To maintain APC loop stability, a 0.1μF bypass capaci-
tor may be required across the photodiode. If the APC
function is not used, disconnect the IBIASFB pin.
Enable Inputs
The MAX3263 provides complementary enable inputs
(ENB+, ENB-). The laser is disabled by reducing the ref-
erence voltage outputs (VREF1, VREF2). Only one logic
state enables laser operation (Figure 3 and Table 1).
MAX3263
Single +5V, Fully Integrated,
155Mbps Laser Diode Driver

Partno	Mfg	Dc	Qty	Available	Descript
MAX3263CAG	MAXIM	N/a	2175	avai	Single +5V / Fully Integrated / 155Mbps Laser Diode Driver
MAX3263CAG+ \|MAX3263CAG	MAXIM	N/a	9	avai	Single +5V / Fully Integrated / 155Mbps Laser Diode Driver