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CXA3099N Datasheet(PDF) 11 Page - Sony Corporation |
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CXA3099N Datasheet(HTML) 11 Page - Sony Corporation |
11 / 15 page —11— CXA3099N 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 with the demodulated detector will be output to DET OUT (Pin 6) through the internal primary LPF. DET OUT output impedance is 200 Ω or less. The DET OUT output is the anti-phase output to NRZ OUT. The CDBM455C28 (MURATA MFG. CO., LTD.) ceramic discriminator is recommended for the CXA3099N. 5) Filter Buffer, Level Comparator and NRZ Comparator An operational amplifier for LPF is built in this IC. It is connected internally to the NRZ comparator, level comparator and quick charge circuit. Using the operational amplifier of Pins 7 and 8 to construct an 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. 6) REG CONT Controls the base bias of the external transistors. 4.7k VCC DET OUTPUT 4 5 6 Ceramic discriminator CDBM455C28 L.C. 11 12 0.2V 4 7 8 9 10 VCC (10) VCC 1.4V CMOS IC 12 16 CMOS power supply Comparator output Fig. 6 Fig. 5 Fig. 4 |
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