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TA31273FN Datenblatt(PDF) 6 Page - Toshiba Semiconductor |
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TA31273FN Datenblatt(HTML) 6 Page - Toshiba Semiconductor |
6 / 14 page TA31273FN 2002-07-08 6 11. Bit rate filter for AM The current AM bit rate filter is used as a quadratic filter. If the filter is to be used at a rate other than 1200 bps, please change the filter constant. Quadratic filter (NRZ) (The bit rate filter time constant takes into account the internal resistance RSSI (20 k Ω).) R9 R8 C14 C13 1200 bps 47 k Ω 68 k Ω 1500 pF 4700 pF 2400 bps 47 k Ω 68 k Ω 680 pF 2200 pF 4800 bps 47 k Ω 68 k Ω 390 pF 1000 pF When the filter constants shown below are used, it is not necessary to set the R9 constant value. R9 R8 C14 C13 1200 bps 20 k Ω 2200 pF 6800 pF 2400 bps 20 k Ω 1500 pF 3300 pF 4800 bps 20 k Ω 820 pF 1800 pF In addition, the current AM bit rate filter can be used as a tertiary filter. If the filter is to be used at a rate other than 1200 bps, please change the filter constant. Quadratic filter (NRZ) (The bit rate filter time constant takes into account the internal resistance RSSI (20 k Ω).) R10 R9 R8 C16 C14 C13 1200 bps 47 k Ω 68 k Ω 68 k Ω 3300 pF 560 pF 0.01 µF 2400 bps 47 k Ω 68 k Ω 68 k Ω 1500 pF 270 pF 4700 pF 4800 bps 47 k Ω 68 k Ω 68 k Ω 680 pF 150 pF 2200 pF When the filter constants shown below are used, it is not necessary to set the R10 constant value. R10 R9 R8 C16 C14 C13 1200 bps 20 k Ω 20 k Ω 8200 pF 2200 pF 0.033 µF 2400 bps 20 k Ω 20 k Ω 3900 pF 1000 pF 0.015 µF 4800 bps 20 k Ω 20 k Ω 1800 pF 470 pF 6800 pF |
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