MAX3667ECJ ,+3.3V / 622Mbps SDH/SONET Laser Driver with Automatic Power ControlApplications622Mbps SDH/SONET Access NodesPin Configuration appears at end of data sheet.Laser Driv ..
MAX3668EHJ+ ,+3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power ControlELECTRICAL CHARACTERISTICS(V = +3.14V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX3668EHJ+T ,+3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Controlapplications up to 622Mbps. It accepts differentialPECL inputs, provides bias and modulation curren ..
MAX3668EHJ+T ,+3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power ControlApplicationsMAX3668EHJ+ -40°C to +85°C 32 TQFP (5mm x 5mm)622Mbps SDH/SONET Access NodesMAX3668E/D ..
MAX3669EHJ ,+3.3V / 622Mbps SDH/SONET Laser Driver with Current Monitors and APCELECTRICAL CHARACTERISTICS(V = +3.14V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX3669EHJ ,+3.3V / 622Mbps SDH/SONET Laser Driver with Current Monitors and APCApplicationsNote A: Dice are designed to operate over a -40°C to +140°C622Mbps SDH/SONET Access Nod ..
MAX7311AUG ,2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion ProtectionApplicationsMAX7311AWG -40°C to +125°C 24 Wide SO —ServersMAX7311AAG -40°C to +125°C 24 SSOP —RAID ..
MAX7311AUG+ ,2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion ProtectionELECTRICAL CHARACTERISTICS+ +(V = 2V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical ..
MAX7311AUG+T ,2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protectionapplications. The MAX7311 consists of inputport registers, output port registers, polarity inversio ..
MAX7311AUG+T ,2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion ProtectionELECTRICAL CHARACTERISTICS (continued)+ +(V = 2V to 5.5V, T = -40°C to +125°C, unless otherwise not ..
MAX7312AAG+ ,2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion ProtectionApplications(4mm x 4mm)Servers/BladesMAX7312AUG -40°C to +125°C 24 TSSOP —RAID SystemsSMBus is a tr ..
MAX7312AAG+ ,2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion ProtectionELECTRICAL CHARACTERISTICS+ +(V = 2V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical ..
MAX3667ECJ
+3.3V / 622Mbps SDH/SONET Laser Driver with Automatic Power Control
________________General DescriptionThe MAX3667 is a complete, +3.3V laser driver with
automatic power control (APC), designed for SDH/
SONET applications up to 622Mbps. It accepts differ-
ential PECL inputs, provides single-ended bias and
modulation currents, and operates over a -40°C to
+85°C temperature range.
A temperature-stabilized reference voltage simplifies
laser current programming. It allows external program-
ming of the modulation current between 5mAp-p and
60mAp-p, and of the bias current between 5mA and
90mA.
The APC function, which incorporates a monitor photo-
diode, an external resistor, and two external capacitors,
maintains constant laser output power. Two current
monitors provide high-speed signals that are directly
proportional to the bias and modulation currents.
Additional features include disable/enable control and
a slow-start feature with a minimum turn-on time of
50ns. The MAX3667 is available in die form and in a
32-pin TQFP package.
________________________Applications622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Repeaters
____________________________FeaturesSingle +3.3V or +5.0V OperationAutomatic Average Power ControlBias Current and Modulation Current Monitor
OutputsTTL-Compatible Disable InputTemperature-Compensated ReferencePECL-Compatible Data Inputs
MAX3667
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
____________________________________________________Typical Operating Circuit
MAX3667
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= +3.3V ±5%, TA= -40°C to +85°C, unless otherwise noted.) (Notes 1, 2)
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.
Supply Voltage, VCC..............................................-0.5V to +7.0V
Current into IBIAS..............................................-50mA to 350mA
Current into IMOD.............................................-50mA to 200mA
Current into MD..................................................................±7mA
Voltage at APC, MODMON,
BIASMON, COMP....................................-0.5V to (VCC+ 0.5V)
Voltage at IN+, IN-, DISABLE, MODSET,
BISASSET, APCSET, PULLUP..................-0.5V to (VCC+ 0.5V)
Continuous Power Dissipation (TA= +85°C)
TQFP (derate 11.1mW/°C above +85°C)......................721mW
Operating Temperature Range...........................-40°C to +85°C
Operating Junction Temperature Range (die)..-55°C to +175°C
Processing Temperature (die).........................................+400°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX3667
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
Note 1:Dice are tested at TA= +27°C.
Note 2:Minimum voltage at IBIAS = VCC- 1.6V.
Note 3:The sum of the currents flowing into VCCand PULLUP with RBIASSET= RMODSET= RAPCSET= 2kΩ, IN+ = 1.82V,
IN- = 2.14V.
Note 4:APC is connected to BIASSET for closed-loop operation.
Note 5:Bias current range is guaranteed by the IBIASSETto IBIAS gain test.
Note 6:RPULL-UPis connected between IMOD and PULLUP.
Note 7:VREFis the voltage on BIASSET, MODSET, or APCSET with RBIASSET= RMODSET= RAPCSET= 2kΩ.
Note 8:APC is disconnected from BIASSET for open-loop operation.
Note 9:Bias current stability is guaranteed by design and characterization.
Note 10:IQMODis the current flowing into the collector of QMOD(Figure 1).
Note 11:AC parameters are guaranteed by design and characterization.
Note 12:Modulation current range is guaranteed by the IMODSETto IQMODgain test.
Note 13:Input signal is a 155Mbps 1-0 pattern. PWD = [(width of wider pulse) - (width of narrower pulse)] / 2.
DC ELECTRICAL CHARACTERISTICS(VCC= +5.0V ±5%, TA= -40°C to +85°C, unless otherwise noted.) (Notes 1, 2)
AC ELECTRICAL CHARACTERISTICS(VCC= +3.3V ±5%, TA= -40°C to +85°C, RLOAD= 10Ω, unless otherwise noted.) (Notes 2, 11)
MAX3667
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
__________________________________________Typical Operating Characteristics(TA = +25°C, VCC= +3.3V, unless otherwise noted.)
MAX3667
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
____________________________Typical Operating Characteristics (continued)(TA = +25°C, VCC= +3.3V, unless otherwise noted.)
______________________________________________________________Pin Description
MAX3667
_______________Detailed DescriptionLow-voltage operation of laser diodes and optical
transmitters produces stringent headroom conditions
for laser drivers. Fast changes in modulation current
produce large inductive voltage spikes, creating device
saturation problems. Therefore, for +3.3V operation, the
MAX3667’s modulation current should be AC coupled
to the cathode of a laser diode. The recommended DC
blocking capacitor value is 1µF. A simplified block dia-
gram of the modulation driver is shown in Figure 1.
The IMOD pin is internally biased through a 31Ωpull-up
resistor. This design decouples the headroom associat-
ed with the modulation driver from the forward voltage
drop of the laser diode, allowing the circuit to tolerate
greater di/dt voltage transients. The design of the
MAX3667 assumes a maximum DC forward-voltage
drop of 1.6V across the laser diode. Bias current is DC
coupled to the laser diode separately at the IBIAS out-
put. In most applications, some small amount of resis-
tance should be added in series with the DC blocking
capacitor to help damp out the aberrations created by
parasitic elements.
Automatic Power Control The automatic power control (APC) feature allows an
optical transmitter to maintain constant power, despite
changes in laser efficiency due to temperature and
aging. The APC loop requires the use of a PIN monitor
photodiode, which generates a current proportional to
the laser diode output power. A scaled version of the
current flowing into the MD pin is compared to a scaled
version of the current flowing out of the APCSET pin.
When these currents are of equal value, the inputs of
the operational transconductance amplifier (OTA) are
balanced, and COMP is forced to approximately 1V.
When the average value of the monitor diode current
exceeds the value established by the APCSET current,
the COMP voltage is forced lower. If the average value
of the monitor diode current is less than the value
established by the APCSET current, the COMP node
voltage is forced higher. The output of the OTA (the
APC pin), when connected directly to BIASSET (closed-
loop condition), is used as an error signal to adjust the
bias current flowing into BIASSET. The maximum OTA
output current is approximately ±250µA.
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power ControlFigure 1. Simplified Modulation Driver Block Diagram
