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AD8001ART-REEL7 Fiches technique(PDF) 14 Page - Analog Devices |
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AD8001ART-REEL7 Fiches technique(HTML) 14 Page - Analog Devices |
14 / 16 page REV. C AD8001 –14– Layout Considerations The specified high speed performance of the AD8001 requires careful attention to board layout and component selection. Proper RF design techniques and low parasitic component selec- tion are mandatory. The PCB should have a ground plane covering all unused por- tions of the component side of the board to provide a low im- pedance ground path. The ground plane should be removed from the area near the input pins to reduce stray capacitance. Chip capacitors should be used for supply bypassing (see Figure 49). One end should be connected to the ground plane and the other within 1/8-inch of each power pin. An additional large (4.7 µF–10 µF) tantalum electrolytic capacitor should be con- nected in parallel, but not necessarily so close, to supply current for fast, large-signal changes at the output. The feedback resistor should be located close to the inverting input pin in order to keep the stray capacitance at this node to a minimum. Capacitance variations of less than 1 pF at the invert- ing input will significantly affect high speed performance. Stripline design techniques should be used for long signal traces (greater than about 1 in.). These should be designed with a characteristic impedance of 50 Ω or 75 Ω and be properly termi- nated at each end. Inverting Configuration Supply Bypassing C1 0.1 F C2 0.1 F +VS –VS C3 10 F C4 10 F Noninverting Configuration RF RO IN +VS –VS RS RT RG OUT RF RO IN +VS –VS RT RG OUT Figure 49. Inverting and Noninverting Configurations for Evaluation Boards Table I. Recommended Component Values AD8001AN (DIP) AD8001AR (SOIC) AD8001ART (SOT-23-5) Gain Gain Gain Component –1 +1 +2 +10 +100 –1 +1 +2 +10 +100 –1 +1 +2 +10 +100 RF (Ω) 649 1050 750 470 1000 604 953 681 470 1000 845 1000 768 470 1000 RG (Ω) 649 750 51 10 604 681 51 10 845 768 51 10 RO (Nominal) (Ω) 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 RS (Ω)0 0 0 RT (Nominal) (Ω) 54.9 49.9 49.9 49.9 49.9 54.9 49.9 49.9 49.9 49.9 54.9 49.9 49.9 49.9 49.9 Small Signal 340 880 460 260 20 370 710 440 260 20 240 795 380 260 20 BW (MHz) 0.1 dB Flatness 105 70 105 130 100 120 110 300 145 (MHz) |
Numéro de pièce similaire - AD8001ART-REEL7 |
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Description similaire - AD8001ART-REEL7 |
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