MAX3766EEP 查看數據表（PDF） - Maxim Integrated

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MAX3766EEP

622Mbps LAN/WAN Laser Driver w

Maxim Integrated 

622Mbps LAN/WAN Laser Driver with

Automatic Power Control and Safety Shutdown

Pin Description

PIN

NAME

FUNCTION

1

BIASMAX

The current into BIASMAX sets the maximum laser bias current. Connecting BIASMAX directly to REF1

allows the largest possible bias current.

The resistance (RTC) between TC and REF1 programs the temperature coefficient of REF2. Connecting

2

TC

TC directly to REF1 produces the minimum tempco. Leaving TC unconnected produces the maximum

tempco.

3

REF2

REF2 is the reference voltage used to program the modulation current. The tempco of REF2 is pro-

grammed by RTC.

4

MOD

The current into MOD programs the laser modulation current. Connect MOD to REF2 with a resistor or

potentiometer.

5, 8

GND

Ground. All grounds must be connected.

6

IN-

Inverting Data Input

7

IN+

Noninverting Data Input

9

VCC

Positive Supply Voltage. All VCC pins must be connected.

10

ENABLE

ENABLE is a TTL-compatible input. When low or open, this pin disables the output modulation and bias

current.

A capacitor to ground at SAFETY determines the turn-on delay for the safety circuits. If SAFETY is

11

SAFETY

grounded or TTL low, internal safety shutdown features are disabled. A TTL high at SAFETY enables the

internal safety shutdown features.

12

FAIL

The FAIL output asserts low if the voltage at MD is above or below nominal. FAIL also asserts if REF1 is

inadvertently tied to the positive supply. FAIL has TTL-compatible output voltage levels.

13

VCCOUT

Supply Voltage for the Output Current Drivers

14

OUT-

Inverting Modulation-Current Output

15

OUT+

Noninverting Modulation-Current Output

16

BIAS

Connection for the DC Laser Bias Current

17

GNDOUT Ground for the Output Current Drivers

18

MD

Input for the laser monitor photodiode current.

19

POWERSET

The current into POWERSET programs the average optical output power when automatic power

control is used.

20

REF1

REF1 is a voltage reference used to program laser bias current and average power.

6 _______________________________________________________________________________________

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