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PDF ( 数据手册 , 数据表 ) I7032

零件编号 I7032
描述 200 Mbps Laser-Diode Driver
制造商 ETC
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I7032 数据手册, 描述, 功能
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i7032
200 Mbps Laser-Diode Driver
Data Sheet
iCreate Technologies Corporation
© 2003 iCreate Technologies Corporation
This document contains preliminary information on product but not yet fully characterized.
iCreate Technologies Corporation reserves the right to change the specification in any manner without notice.
ICR-DS-i7032001







I7032 pdf, 数据表
i7032
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5.5. Slow-start
For the laser safety reason, the i7032 sets
start-up time for enabling a laser diode by an
external capacitor connected to ground.
5.6. Temperature compensation
The i7032 output current is programmed by
current mirrors. These mirrors each have a
2xVBE temperature coefficient. The reference
voltage (VREF1, VREF2) is adjusted 2xVBE to
greatly cancel these changes. This provides very
stable output currents with respect to
temperature.
Utilizing a resistor at IMODTC pin can
compensate the reduction in slope efficiency of
typical laser diodes caused by increased
temperature. This feature adds the temperature-
compensated portion of the modulation current.
Please refer to 4.3. Typical operating
characteristics figure 7 for more details.
6. Application information
6.1 Typical closed loop application
When the laser-diode/VCSEL includes a
monitor photodiode, the closed loop scheme
should be adopted. The voltage at IPIN is equal
to 4/7xVcc. The automatic power control loop
increases or decreases IBIASFB such that the
current from the monitor photodiode remains
constant. Knowing the monitor photodiode
current at the desired output power, we can
determine the RPINSET value from 4.3. Typical
operating characteristics figure 6.
The automatic power control circuit can
adjust the bias current 50mA from the initial set
point. This feature makes the laser driver circuit
reasonably insensitive to variations of laser
threshold from lot to lot. The bias setting can be
determined using the laser threshold current or
the midpoint of the highest and lowest expected
threshold value.
6.2 Setting modulation current
When the temperature-independent
modulation current is used, the external resistor
connected to IMODSET pin can be used to set
the modulation current and IMODTC pin should
be connected to VCC while the temperature-
compensated modulation is used, resistors at
the IMODSET and IMODTC pins set the
amplitude of the modulation current ( please
refer to 7. Typical application circuits, figure 9
and figure 10).
The resistor RMODTC sets the temperature-
stable portion of the modulation current while the
resistor RMODTC sets the temperature-increasing
portion of the modulation current. By varying the
value of RMODTC with respect to RMODSET, the
positive temperature coefficient can be set from
2500 ppm/°C to 500 ppm/°C. Table 2 is the
reference value of how the modulation current
changes with resistance over temperature.
Figure 8 shows a family of curves which depict
the relationship between temperature
coefficients and constant modulation currents.
6.3 Rise/fall time and overshoot
adjustment
The rise/fall time and overshoot of i7032 can
be adjusted by an external resistor at ROSADJ
pin, increasing this resistor slows the rise/fall
time and reduces overshoot in the modulation
signal. A smaller resistor value (around 1K) is
recommended to an initial point.
© 2003 iCreate Technologies Corporation
This document contains preliminary information on product but not yet fully characterized.
iCreate Technologies Corporation reserves the right to change the specification in any manner without notice.
Page 6
ICR-DS-i7032001














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