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LTC6602 Datasheet(PDF) 22 Page - Analog Devices |
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LTC6602 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 40 page ![]() LTC6601-2 22 66012f APPLICATIONS INFORMATION A GALLERY OF BASIC FILTER TOPOLOGIES Tables 2 through 10 list (sorted by Gain) a hundred possible filter topologies that can be easily implemented with the LTC6601. The tables also list the LTC6601-2 approximate midband (1MHz) spot noise ein referred to the input re- sistor, R1 (with the BIAS pin pulled to V+). The gains for these topologies range from 1V/V to 7V/V. The Qs listed are within the range of 0.54 and 1.72. The fOs listed are in the range of 6.96MHz and 22.71MHz, and the –3dB frequencies listed range from 5.5MHz to 27.5MHz. For all filters listed, R3 = 125Ω. Figures 7 to 10 show how to pin-strap each filter configuration. Table 2. Gain of 7 Filter Configurations GAIN fO (MHz) f–3dB (MHz) Q R1 (Ω) R2 (Ω) C1 (pF) C2 (pF) ein (nV/√Hz) V/V dB 7.0 16.902 10.38 7.43 0.539 57.14 400.00 48.2 97.6 6.1 7.0 16.902 9.57 10.36 0.771 57.14 400.00 48.2 114.8 6.1 7.0 16.902 8.96 12.10 1.175 57.14 400.00 48.2 130.9 6.1 7.0 16.902 8.12 7.49 0.656 57.14 400.00 58.75 130.9 6.1 Table 3. Gain of 6 Filter Configurations GAIN fO (MHz) f–3dB (MHz) Q R1 (Ω)R2 (Ω)C1 (pF) C2 (pF) ein (nV/√Hz) V/V dB 6.0 15.563 10.38 10.03 0.684 66.67 400.00 48.2 97.6 6.2 6.0 15.563 9.57 12.52 1.071 66.67 400.00 48.2 114.8 6.2 6.0 15.563 8.67 7.67 0.634 66.67 400.00 58.75 114.8 6.2 6.0 15.563 8.12 9.59 0.870 66.67 400.00 58.75 130.9 6.2 6.0 15.563 7.47 6.07 0.592 66.67 400.00 69.3 130.9 6.2 Table 4. Gain of 5 Filter Configurations GAIN fo (MHz) f–3dB (MHz) Q R1 (Ω)R2 (Ω) C1 (pF) C2 (pF) ein nV/√Hz V/V dB 5.0 13.979 11.36 9.67 0.614 80.00 400.00 48.2 81.5 6.5 5.0 13.979 10.38 12.78 0.936 80.00 400.00 48.2 97.6 6.5 5.0 13.979 9.40 7.67 0.594 80.00 400.00 58.75 97.6 6.5 5.0 13.979 8.67 10.07 0.849 80.00 400.00 58.75 114.8 6.5 5.0 13.979 8.12 11.25 1.290 80.00 400.00 58.75 130.9 6.5 5.0 13.979 7.98 6.46 0.591 80.00 400.00 69.3 114.8 6.5 5.0 13.979 7.47 8.16 0.779 80.00 400.00 69.3 130.9 6.5 5.0 13.979 6.96 5.50 0.579 80.00 400.00 79.85 130.9 6.5 |
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