MAX3766芯片手册资源-CSDN文库

MAX3766

光纤收发芯片

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________________General Description

The MAX3766 is a complete, easy-to-program laser

driver for fiber optic LAN transmitters, optimized for

operation at 622Mbps. It includes a laser modulator,

automatic power control (APC), and a failure indicator

with latched shutdown.

Laser modulation current can be programmed up to

60mA at 622Mbps. A programmable modulation tem-

perature coefficient can be used to keep the transmit-

ted extinction ratio nearly constant over a wide

temperature range. The modulator operates at data

rates up to 1.25Gbps at reduced modulation current.

APC circuitry uses feedback from the laser’s monitor

photodiode to adjust the laser bias current, producing

constant output power regardless of laser temperature

or age. The MAX3766 supports laser bias currents up

to 80mA.

The MAX3766 provides extensive laser safety features,

including a failure indicator with latched shutdown and

a smooth start-up bias generator. These features help

ensure that the transmitter output does not reach haz-

ardous levels. The MAX3766 is available in a compact

20-pin QSOP and dice.

________________________Applications

622Mbps ATM Transmitters

1.25Gbps Fiber Optic LAN Transmitters

1.25Gbps Ethernet Transmitters

____________________________Features

♦ 60mA Modulation Current

♦ 80mA Bias Current

♦ 200ps Edge Speed

♦ Modulation-Current Temperature Compensation

♦ Automatic Power Control

♦ Laser-Fail Indicator with Latched Shutdown

♦ Smooth Laser Start-Up

MAX3766

622Mbps LAN/WAN Laser Driver with

Automatic Power Control and Safety Shutdown

________________________________________________________________ Maxim Integrated Products 1

19-1249; Rev 1; 11/04

EVALUATION KIT

AVAILABLE

Ordering Information

*Dice are designed to operate over this range, but are tested and

guaranteed at T

= +25°C only. Contact factory for availability.

+Denotes lead-free package.

Typical Application Circuits appear at end of data sheet.

Pin Configuration

REF1

POWERSET

GNDOUTMOD

REF2

BIASMAX

TOP VIEW

BIAS

OUT+

OUT-

CCOUT

GND

IN+

IN-

GND

FAIL

SAFETYENABLE

MAX3766

QSOP

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

PART TEMP RANGE PIN-PACKAGE

MAX3766EEP -40°C to +85°C 20 QSOP

MAX3766EEP+ -40°C to +85°C 20 QSOP

MAX3766E/D -40°C to +85°C Dice*

MAX3766

622Mbps LAN/WAN Laser Driver with

Automatic Power Control and Safety Shutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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, V

, V

OUT

.................................-0.5V to 7.0V

Voltage at IN+, IN-, ENABLE,

SAFETY, FAIL ...........................................-0.5V to (V

+ 0.5V)

Voltage at MOD, BIASMAX, POWERSET, TC ..........-0.5V to 4.0V

Current out of REF1, REF2 .................................-0.1mA to 10mA

Current into OUT+, OUT- ....................................-5mA to 100mA

Current into BIAS.................................................-5mA to 130mA

Current into MD .......................................................-5mA to 5mA

Current into FAIL ...................................................-5mA to 30mA

Current into SAFETY..............................................-5mA to 10mA

Continuous Power Dissipation (T

= +85°C)

QSOP (derate 9.1mW/°C above +85°C).......................590mW

Operating Junction Temperature Range...........-40°C to +150°C

Processing Temperature (dice) .......................................+400°C

Storage Temperature Range .............................-55°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

CONDITIONS UNITSMIN TYP MAXPARAMETER

V4.5 5.0 5.5Supply Voltage, V

(Note 1) °C-40 25 85Ambient Operating Temperature

Referenced to V

V-1.4 -1.3 -1.19Input Common-Mode Voltage

V0.8Enable Input Low

IN+

- V

IN-

, common-mode input =

- 1.3V, Figure 1

V2.0Enable Input High

mV500 1000 1800Differential Input Signal Amplitude

- 2.5Voltage at BIAS

While using APC %50Data Duty Cycle

GbpsDC to 1.25Data Rate

- 2.5Voltage at OUT+, OUT-

Not tested mA/mA0.001 to 0.1Laser to PIN Coupling

F AIL

= 5.1kΩ V4.3

FAIL Output High

(Note 3) mA0.5 80Bias-Current Range

(Note 2)

> 15µA, R

F AIL

= 5.1kΩ V0.33 0.44

FAIL Output Low

mA21 25 32Supply Current

µA0.1 10

Bias Current when Driver is

Disabled or Shut Down

Input data low (Note 2) µA1 200Modulation Current

Input data high (Note 3) mA260

Modulation-Current Programmable

Range

= 0Ω ppm/°C-50

Minimum Modulation-Current

Temperature Compensation

µA10

Modulation Current when Driver is

Disabled or Shut Down

All DC testing uses 5.1kΩ load kΩ2.7 to 20

FAIL Load

= open ppm/°C5600

Maximum Modulation-Current

Temperature Compensation

RECOMMENDED OPERATING CONDITIONS

DC PARAMETERS

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