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AD8073JR データシート(PDF) 10 Page - Analog Devices |
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AD8073JR データシート(HTML) 10 Page - Analog Devices |
10 / 12 page REV. D AD8072/AD8073 –10– Crosstalk Crosstalk between internal amplifiers may vary depending on which amplifier is being driven and how many amplifiers are being driven. This variation typically stems from pin location on the package and the internal layout of the IC itself. Table I illustrates the typical crosstalk results for a combination of conditions. Table I. AD8073JR Crosstalk Table (dB) Receive Amplifier AD8073JR 12 3 1 X –60 –56 Drive 2 –60 X –60 Amplifier 3 –54 –60 X All Hostile –53 –55 –54 CONDITIONS VS = ±5 V RF = 1 k Ω, R L = 150 Ω AV = 2 VOUT = 2 V p-p on Drive Amplifier Layout Considerations The specified high speed performance of the AD8072 and AD8073 require careful attention to board layout and compo- nent selection. Proper RF design techniques and low parasitic component selection are mandatory. The PCB should have a ground plane covering all unused portions of the component side of the board to provide a low impedance 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. One end of the capacitor should be connected to the ground plane and the other within 1/8 inches of each power pin. An additional large (4.7 µF–10 µF) tantalum electrolytic capacitor should be connected in parallel, but not necessarily as close to the supply pins, to provide current for fast large-signal changes at the device’s 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 affect high speed performance. Stripline design techniques should be used for long signal traces (greater than approximately 1 inch). These should be designed with a characteristic impedance of 50 Ω or 75 Ω and be properly terminated at each end. |
同様の部品番号 - AD8073JR |
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同様の説明 - AD8073JR |
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