CXA3107N Ver la hoja de datos (PDF) - Sony Semiconductor
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CXA3107N Datasheet PDF : 18 Pages
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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.
4
5
6
8.2k
Ceramic discriminator
CDBM455C50
VCC
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.
16
10
11
L.C.
0.2V
LPF
DET
4
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.
VCC 20
VCC 1.4V
CMOS power supply
(11)
16
CMOS IC
Comparator output
Fig. 5
6) REG CONT
Controls the base bias of the external transistors.
—11—
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