Single +5V, Fully Integrated,
155Mbps Laser Diode Driver
MAX3263
______________________________________________________________Pin Description
PIN
1
2
NAME
VREF2
IPINSET
FUNCTION
Temperature-Compensated Reference Output. VREF2 is internally connected to VREF1.
Monitor Photodiode Programming Input. Connect INPINSET to VREF1 or VREF2 through a
resistor to set the monitor current when using automatic power control (see
Typical Operating
Characteristics).
Failout Output. Active-low, open-collector TTL output indicates if automatic power-control
loop is out of regulation due to insufficient monitor-diode current (when VPIN is below the
2.6V threshold). Connect FAILOUT to VCC through a 2.7kΩ pull-up resistor.
Ground for Voltage Reference and Automatic Power-Control Circuitry
Noninverting PECL Data Input
Inverting PECL Data Input
+5V Supply Voltage for Voltage Reference and Automatic Power-Control Circuitry. Connect
VCCB to the same potential as VCCA, but provide separate bypassing for VCCA and VCCB.
Inverting Enable TTL Input. Output currents are enabled only when ENB+ is high and ENB- is low.
Noninverting Enable TTL Input. Output currents are enabled only when ENB+ is high and
ENB- is low.
Temperature-Compensated Reference Output. VREF1 is internally connected to VREF2.
Overshoot-Adjust Input. Connect to internal voltage reference through a resistor to adjust the
overshoot of the modulation output signal (see
Typical Operating Characteristics).
Bias-Feedback Current Output. Output from automatic power-control circuit. Connect to
I
BIASSET
when using APC.
Laser Bias Current-Programming Input. Connect to internal voltage reference through a resis-
tor to set bias current (see
Typical Operating Characteristics).
I
BIASOUT
= 40 x (I
BIASSET
+ I
BIASFB
).
Laser Modulation Current-Programming Input. Connect to internal voltage reference through
a resistor to set modulation current (see
Typical Operating Characteristics).
I
MOD
= 20 x I
MODSET
.
Laser Bias Current Output. Connect to laser cathode through an R-L filter network (see the
Bias Network Compensation
section).
Ground for Bias and Modulation Current Drivers
Modulation Output. When VIN+ is high and VIN- is low, OUT- sinks I
MOD
.
Modulation Output. When VIN+ is low and VIN- is high, OUT+ sinks I
MOD
.
+5V Supply Voltage for Bias and Modulation Current Drivers. Connect VCCA to the same
potential as VCCB, but provide separate bypassing for VCCA and VCCB.
Monitor Photodiode Current Input. Connect IPIN to photodiode’s anode.
Slow-Start Capacitor Input. Connect capacitor to ground or leave unconnected to set start-up
time, t
STARTUP
= 25.4kΩ (C
SLWSTRT
+
2pF).
3
4, 7
5
6
8
9
10
11
12
13
FAILOUT
GNDB
VIN+
VIN-
VCCB
ENB-
ENB+
VREF1
OSADJ
IBIASFB
14
IBIASSET
15
IMODSET
16
17, 19, 21
18
20
22
23
24
IBIASOUT
GNDA
OUT-
OUT+
VCCA
IPIN
SLWSTRT
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
