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MF10 датащи(PDF) 14 Page - National Semiconductor (TI) |
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MF10 датащи(HTML) 14 Page - National Semiconductor (TI) |
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14 / 20 page ![]() 30 Applications Information (Continued) to 1 by choosing R4A such that R4A ebHOLPA R1A e R1A e 20k If the 50100CL pin is connected to mid-sup- ply for nominal 1001 clock-to-center-frequency ratio we find R2A by R2A e R4A f0A2 (fCLK 100)2 e 2 c 104 c (529)2 (1000)2 e 56k and R3A e QA 0R2AR4A e 0785 056 c 103 c 2 c 104 e 83k The resistors for the second section are found in a similar fashion R1B e 20k R4B e R1B e 20k R2B e R4B f0B2 (fCLK 100)2 e 20k (993)2 (1000)2 e 197k R3B e QB 0R2BR4B e 35590197c104c2c104 e 706k The complete circuit is shown in Figure 16 for split g5V power supplies Supply bypass capacitors are highly recom- mended TLH10399 – 25 FIGURE 16 Fourth-Order Chebyshev Low-Pass Filter from Example in 31 g 5V Power Supply 0V – 5V TTL or b5V g5V CMOS Logic Levels TLH10399 – 26 FIGURE 17 Fourth-Order Chebyshev Low-Pass Filter from Example in 31 Single a10V Power Supply 0V – 5V TTL Logic Levels Input Signals Should be Referred to Half-Supply or Applied through a Coupling Capacitor 14 |
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