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CXA3107N Scheda tecnica(PDF) 11 Page - Sony Corporation |
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CXA3107N Scheda tecnica(HTML) 11 Page - Sony Corporation |
11 / 18 page —11— CXA3107N 4) Detector The detector is of quadrature type. To perform phase shift, connect a ceramic discriminator to Pin 5. The phase shifting capacitor for the quadrature detector is incorporated. The FM (FSK) signal demodulated with the detector will be output to AUDIO (Pin 10) through the internal LPF. The AUDIO output is the anti-phase output to NRZ OUT. The CDBM455C50 (MURATA MFG. CO., LTD) ceramic discriminator is recommended for the CXA3107N. For the 2-level system, the CDBM455C28 can also used. Fig. 3 5) Filter Buffer, Level Comparator and NRZ Comparator The LPF circuit is built in this IC. The LPF output is connected internally to the NRZ comparator, level comparator and quick charge circuit. Fig. 4 Using the LPF, remove noise from the demodulated signal and input the signal to the above three circuits. The level comparator and the NRZ comparator shape waveform of this input signal and output it as a square wave. The comparator output stage is for open collector. Thus, if the CPU is of CMOS type and the supply voltage is different, a direct interface as illustrated in the figure below can be implemented. Fig. 5 6) REG CONT Controls the base bias of the external transistors. 8.2k VCC 4 5 6 Ceramic discriminator CDBM455C50 L.C. 10 16 0.2V 4 11 LPF DET VCC (11) VCC 1.4V CMOS IC 16 20 CMOS power supply Comparator output |
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