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TDA7405 数据表(PDF) 36 Page - STMicroelectronics |
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TDA7405 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 56 page  TDA7405 36/56 Figure 32. Blockdiagram of the Multipath-Detector 5.5 Quality Detector The TDA7405 offers a quality detector output which gives a voltage representing the FM-reception conditions. To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the follow- ing formula : VQual = 1.6 (VNoise-0.8 V)+ a (REF5V-VMpout). The noise-signal is the PEAK-signal without additional influences (see noiseblanker description). The factor 'a' can by programmed to 0.7 .... 1.15. The output is a low impedance output able to drive external circuitry as well as simply fed to an AD-converter for RDS applications. |
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