MAX3646(2004) Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX3646
(Rev.:2004)

155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control

Maxim Integrated 

155Mbps to 622Mbps SFF/SFP

Laser Driver with Extinction Ratio Control

VCC

TX_DISABLE

POR AND COUNTER

60ms DELAY

PC_MON

RPC_MON

BC_MON

RBC_MON

COUNTER

60ms DELAY

VCC

IMD

1

VREF

VCC

COMP

IBIAS

82

VREF

EXCESSIVE

APC CURRENT

SETPOINT

COMP

EXCESSIVE

MOD CURRENT

SETPOINT

100ns DELAY

IMOD

ENABLE

IBIAS

ENABLE

R

Q

RS

LATCH

S

CMOS

SHUTDOWN

TX_FAULT

TTL

OPEN COLLECTOR

Figure 5. Simplified Safety Circuit

Table 1. Typical Fault Conditions

1

If any of the I/O pins are shorted to GND or VCC (single-point failure; see Table 2), and the bias current or the photocurrent

exceeds the programmed threshold.

2 End-of-life (EOL) condition of the laser diode. The bias current and/or the photocurrent exceed the programmed threshold.

3 Laser cathode is grounded and photocurrent exceeds the programming threshold.

4 No feedback for the APC loop (broken interconnection, defective monitor photodiode), and the bias current exceeds the

programmed threshold.

_______________________________________________________________________________________ 9

Share Link: