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MAX3286C/D Datasheet(PDF) 14 Page - Maxim Integrated Products

Part # MAX3286C/D
Description  3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers
PDF  28 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3286C/D Datasheet(HTML) 14 Page - Maxim Integrated Products

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3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
Q1 = general-purpose PNP, β >100, ft > 5MHz
B1 = ferrite bead (see Bias Filter section)
M1 = general-purpose PMOS device (optional)
Common Cathode with Current Feedback
In the common-cathode configuration with current feed-
back, a servo control loop is formed by an external PNP
transistor (Q1), RMON, the controlled-reference voltage
block, RSET, RMD, and the power-control amplifier
(Figure 10). The voltage at MD is stabilized to 1.7V. The
voltage at MON is set by the resistors RSET and RMD.
As in the short-wavelength configuration, a 0.1µF
CBIASDRV connected between BIASDRV and VCC is
sufficient to obtain an approximate 1µs APC loop time
constant. This improves power-supply noise rejection.
To select the external components:
1) Determine the required laser bias current
IBIAS = ITH + IMOD / 2
2) Select RMD and RSET.
Maxim recommends RSET = 1kΩ, RMD = 5kΩ, which
results in VCC - VMON ≈ 250mV.
3) Select RMON where RMON = 250mV / IBIAS, assuming
RSET = 1kΩ and RMD = 5kΩ.
VCC
VCC
RDEG
VCC
CONTROLLED REFERENCE VOLTAGE
VREF = 2.65V
REF
ONLY
MAX3286/96
SHDNDRV
CBIASDRV
BIASDRV
MON
M1
Q1
POL
MD
POWER-CONTROL
AMPLIFIER
LASER
IBIAS
PHOTO
DIODE
ID
FERRITE
BEAD
B1
1.7V
SMOOTH-
START
VCC
RSET
POL
MAX3286
MAX3287
MAX3296
MAX3297
Figure 9. Common-Cathode Laser with Photodiode
VCC
RMON
VCC
CONTROLLED REFERENCE VOLTAGE
VREF = 2.65V - 2.25V (VCC - VMON)
REF
MAX3286/96
ONLY
SHDNDRV
CBIASDRV
BIASDRV
MON
M1
Q1
POL
MD
POWER-CONTROL
AMPLIFIER
IBIAS
ID
FERRITE
BEAD
B1
1.7V
SMOOTH-
START
VCC
RSET
RMD
POL
MAX3286
MAX3288
MAX3296
MAX3298
LASER
Figure 10. Common Cathode with Current Feedback (PNP Configuration)
14
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