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ADN2843 Arkusz danych(PDF) 8 Page - Analog Devices |
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ADN2843 Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 12 page REV. 0 –8– ADN2843 •Best high frequency board layout techniques including power and ground planes should be used. • To minimize inductance, keep the connections between the ADN2845 and the laser diode as short as possible. Inductances <0.3 nH are recommended for best performance. Critical bonds are IMODP and VCC (Pin 14). Ribbon bonding can be used to reduce bond inductance. Minimize bond lengths for ADN2845 pads to achieve low inductance. •Place bypass capacitor on laser anode as close to laser as possible. •Bypass capacitors should be placed as close as possible to VCC pads. • 50 controlled impedance interconnects should be used on the DATA inputs. •Parasitic capacitance on IBIAS_CTRL and IMOD_CTRL interconnects should be less than 100 pF. If decoupling caps are used on IBIAS_CTRL and IMOD_CTRL, they should be tied to VCC rather than GND. • An inductor should be used in the bias current path. A Microwave Components coil 30-1847-GCCAS-01 (48 mil 24 mil) should be used. •The recommended substrate connection is to GND. However, the performance is not affected by connecting the substrate to VCC. 22nF 10nF IDTONE IBMON IMMON ALS FAIL DEGRADE GND ASET ERSET PSET GND IMPD IMPDMON IMPDMON2 ADN2844 1 8 32 25 IMPD2 GND DATAN GND NC GND DATAP IMODNTERM NC IMODP IBIAS ALS GND VCC VCC VCC GND ADN2845 15 18 9 6 1 10 14 5 10nF 10k 1k 1k 22nF 24 17 9 16 VCC 10nF 10nF 100 F TANTALUM VCC 10nF VCC MPD 10nF VCC VCC 10nF VCC NOTES *FOR DIGITAL PROGRAMMING, THE ADN2850 OR ADN2860 OPTICAL SUPERVISOR CAN BE USED. **OPTIONAL MONITORING OF CURRENTS. 1k NC ** ** ** ** VCC VCC VCC VCC VCC Figure 3. ADN2843 Application Circuit (Mode A) |
Podobny numer części - ADN2843_15 |
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Podobny opis - ADN2843_15 |
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