Datenblatt-Suchmaschine für elektronische Bauteile |
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ADN2525ACPZ-WP Datenblatt(PDF) 10 Page - Analog Devices |
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ADN2525ACPZ-WP Datenblatt(HTML) 10 Page - Analog Devices |
10 / 16 page 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 Ω 200 Ω Figure 20. Equivalent Circuit of the BSET Pin 2 Ω 2k Ω 100 Ω IBIAS VCC VCC Figure 21. Equivalent Circuit of the IBIAS Pin VCC IBMON VCC 100 Ω 500 Ω 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 Ω 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 Ω 50k Ω 2k Ω 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 Ω IMOD 200 Ω 800 Ω MSET GND IMODP IMODN ADN2525 VCC FROM INPUT STAGE Figure 25. Generation of Modulation Current on the ADN2525 |
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