MAX3297CUE Просмотр технического описания (PDF) - Maxim Integrated
Номер в каталоге
Компоненты Описание
производитель
MAX3297CUE Datasheet PDF : 28 Pages
| |||
3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
LV
PORDLY
EN
EN
FLTDLY
POL
POL
MON
MD
IN+
IN-
POR CIRCUIT
SAFETY
BIAS GENERATOR
LASER
MODULATOR
POR
FAULT
FAULT
SHDNDRV
MD
BIASDRV
REF
OUT+
OUT-
TC
MODSET
Figure 2a. Simplified Laser Driver Functional Diagram
the anode or cathode of a monitor photodiode or to a
resistor-divider, depending on the specific application
circuit. Three application circuits are supported:
common-cathode laser with photodiode, common-
cathode laser without photodiode, and common-anode
laser with photodiode (as shown in the Design Procedure
section). The POL and POL inputs determine the laser
pinning (common cathode, common anode) (Table 4).
The smooth-start circuitry prevents current spikes to the
laser during power-up or enable; this ensures compliance
with safety requirements and extends the life of the laser.
The power-control amplifier drives an external transistor
to control the laser bias current. In a fault condition, the
power-control amplifier’s output is disabled (high
PORDLY
POR
FAULT
FAULT
FLTDLY
EN
EN
LV
MAX3286
POR CIRCUIT
MAX3296
1.7V
REF
SAFETY
CIRCUITRY
CONTROLLED
REFERENCE
GENERATOR
VCC - 0.54V
1.97V
REF
MON
SHDNDRV
POL
SMOOTH-
POL
START
IN+
IN-
INPUT BUFFER
LASER
MODULATOR
+1.7V
MODULATION CURRENT
GENERATOR
TC
MODSET
RTC
RMOD
1.53V
BIAS GENERATOR
MD
BIASDRV
OUT-
OUT+
50Ω
50Ω
VCC
Figure 2b. Laser Driver Functional Diagram
_______________________________________________________________________________________ 9
Share Link: 