MAX3766E/D 查看數據表（PDF） - Maxim Integrated

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MAX3766E/D

622Mbps LAN/WAN laser driver with automatic power control and safety shutdown.

Maxim Integrated 

622Mbps LAN/WAN Laser Driver with

Automatic Power Control and Safety Shutdown

5.1k

VCC

RMOD

FAIL

MOD

REF2

RTC

TC

REF1

VCC VCC

520Ω

REFERENCE

GENERATOR

2k

V

TEMP

SAFETY

ENABLE

SAFETY

START-UP

CIRCUIT

SHDN

FAILURE

FAILURE

DETECTION

MAX3766

RPOWERSET

RBIASMAX

BIASMAX

POWERSET

BANDGAP

520Ω

300Ω

CMD

V

TEMP

POWERSET

MIRROR

1X

APC

IAPC

MONITOR-

DIODE

AMPLIFIER

MD

VCC

MONITOR

PHOTODIODE

VCC - 2V

AUTOMATIC

POWER CONTROL

LASER

BIAS

VCC

IN+

IN-

PECL

INPUT

BUFFER

SHDN

MODULATION

MIRROR

30X

MODULATION-

CURRENT

DRIVER

BIAS

MIRROR

40X

LASER BIAS CIRCUIT

OUT+

OUT-

VCC

GNDOUT

VCCOUT

Figure 2. Functional Diagram

The available laser bias current is programmed by

connecting external resistor RBIASMAX from REF1 to

BIASMAX. The BIASMAX programming current is

adjusted by the APC circuit and amplified by the laser

bias circuit.

An internal 520Ω resistor between BIASMAX and the

mirror input at internal node APC limits the maximum

laser bias current when BIASMAX is connected directly

to REF1. BIASMAX can be directly connected to REF1

in space-constrained designs, causing the maximum

programming current (about 2.5mA) to flow into

BIASMAX. Selecting a BIASMAX resistor saves power

and limits the transmitter’s maximum light output.

RBIASMAX can be estimated as follows:

( ) 1.55V 40

RBIASMAX =

− 520Ω

I BIASMAX

This equation applies to maximum bias currents above

10mA.

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