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ADN2525ACPZ-WP Datenblatt(PDF) 10 Page - Analog Devices

Teilenummer ADN2525ACPZ-WP
Bauteilbeschribung  10.7 Gbps Active Back-Termination, Differential Laser Diode Driver
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADN2525ACPZ-WP Datenblatt(HTML) 10 Page - Analog Devices

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ADN2525
Rev. 0 | Page 10 of 16
The equivalent circuits of the BSET, IBIAS, and IBMON pins
are shown in Figure 20, Figure 21, and Figure 22.
VCC
BSET
VCC
800
200
Figure 20. Equivalent Circuit of the BSET Pin
2
2k
100
IBIAS
VCC
VCC
Figure 21. Equivalent Circuit of the IBIAS Pin
VCC
IBMON
VCC
100
500
VCC
Figure 22. Equivalent Circuit of the IBMON Pin
The recommended configuration for BSET, IBIAS, and IBMON
is shown in Figure 23.
ADN2525
BSET
VBSET
GND
IBMON
IBIAS
TO LASER CATHODE
L
RIBMON
1k
IBIAS
Figure 23. Recommended Configuration for BSET, IBIAS, and IBMON Pins
The circuit used to drive the BSET voltage must be able to drive
the 1 kΩ input resistance of the BSET pin. For proper operation
of the bias current source, the voltage at the IBIAS pin must be
between the compliance voltage specifications for this pin over
supply, temperature, and bias current range. See the Specifications
table. The maximum compliance voltage is specified for only
two bias current levels (10 mA and 100 mA), but it can be
calculated for any bias current by using the following equation:
VCOMPLIANCE_MAX(V) = VCC(V) − 0.75 − 4.4 × IBIAS(A)
See the Applications Information section for example headroom
calculations.
The function of the inductor L is to isolate the capacitance of
the IBIAS output from the high frequency signal path. For
recommended components, see Table 5.
AUTOMATIC LASER SHUTDOWN (ALS)
The ALS pin is a digital input that enables/disables both the bias
and modulation currents, depending on the logic state applied,
as shown in Table 4.
Table 4.
ALS Logic State
IBIAS and IMOD
High
Disabled
Low
Enabled
Floating
Enabled
The ALS pin is compatible with 3.3 V CMOS and TTL logic
levels. Its equivalent circuit is shown in Figure 24.
VCC
ALS
VCC
100
50k
2k
Figure 24. Equivalent Circuit of the ALS Pin
MODULATION CURRENT
The modulation current can be controlled by applying a dc
voltage to the MSET pin. This voltage is converted into a dc
current by using a voltage-to-current converter using an
operational amplifier and a bipolar transistor as shown in
Figure 25.
50
IMOD
200
800
MSET
GND
IMODP
IMODN
ADN2525
VCC
FROM INPUT STAGE
Figure 25. Generation of Modulation Current on the ADN2525


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