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LT5581IDDB-PBF Datasheet(PDF) 11 Page - Linear Technology |
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LT5581IDDB-PBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LT5581 11 5581f APPLICATIONS INFORMATION OPERATION To achieve an accurate average power measurement of the high crest factor modulated RF signals, the LT5581 combines a proprietary high speed power measurement subsystem with an internal 150kHz low pass averag- ing filter and an output voltage buffer in a completely integrated solution with minimal off-chip components. The resulting output voltage is directly proportional to the average RF input power in dBm. Figure 1 shows the evaluation circuit schematic, and Figures 2 and 3 show the associated board artwork. For best high frequency performance, it is important to place many ground vias directly under the package. RF Input Matching The input resistance is about 205Ω. Input capacitance is 1.6pF. The impedance vs frequency of the RF input is detailed in Table 1. Figure 2. Top Side of Evaluation Board Figure 3. Bottom Side of Evaluation Board Table 1. RF Input Impedance FREQUENCY (MHz) INPUT IMPEDANCE (Ω) S11 MAG ANGLE (°) 10 203.6-j5.5 0.606 –0.8 50 199.5-j22.4 0.603 –3.4 100 191.7-j40.3 0.601 –6.4 200 171.1-j68.5 0.601 –12.3 400 121.8-j95.4 0.608 –24 500 100.2-j97.5 0.613 –29.8 800 56.8-j86.5 0.631 –46.5 900 48-j81.2 0.638 –51.8 1000 41.1-j76 0.645 –56.8 1500 22.2-j55 0.679 –79.5 2000 14.6-j41.4 0.710 –97.9 2100 13.6-j39.2 0.716 –101.2 2500 10.8-j32.1 0.737 –112.9 3000 8.6-j25 0.759 –125.7 3500 7.3-j19.4 0.774 –136.9 4000 6.6-j14.5 0.783 –147.1 5000 8.8-j9.6 0.709 –157.6 6000 6.4-j0 0.774 –179.9 5581 F03 5581 F02 |
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