CXA2013 データシートの表示（PDF） - Sony Semiconductor
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CXA2013 Datasheet PDF : 23 Pages
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CXA2013M
Description of Operation
The sound mutiplexing signal input from Pin 5 is passed through IN AMP and is applied to the Cue BPF, Sub
BPF, and Main de-emphasis circuit.
1. Discrimination circuits
Cue BPF passes only the Cue signal component from the multiplex signal. In the AM demodulator, the
signal (AM wave) is AM detected and one of two sine waves is generated, either a 922.5Hz signal for
bilingual broadcasts or a 982.5Hz signal for stereo broadcasts.
In the 952Hz BPF, the 3.5fH carrier component is eliminated from the Cue signal after AM wave detection.
The Cue signal, from which the carrier component has been eliminated, is waveform shaped by COMP, with
the resulting 922.5Hz or 982.5Hz pulse being applied to the Logic section.
In the 3.5fH VCO, a 3.5fH pulse locked onto the Cue signal carrier (3.5fH) is created and sent to the Logic
section.
In the Logic section, the broadcast mode is identified using the countdown method. Depending on this
result as well as the presence of a SUB signal from SUB detector and the MUTE ON/OFF, MODE
switching, and FOMO ON/OFF instructions from CONT, the output switching control signal is created. This
signal is used to control the output condition of OUTPUT SW and MAIN OUT.
2. Main circuits
In MAIN DEEM, de-emphasis is applied to the Main signal component and the Sub and Cue components
are removed.
After passing through the MAIN DEEM, the Main signal is applied to MATRIX, OUTPUT AMP, and
MAINOUT.
3. Sub circuits
In SUB BPF, only the SUB signal component out of multiplex signals is passed through. In the 4.5fH trap,
the digital facsimile signal component is removed.
In FM Demod, the SUB signal is FM demodulated.
In SUB DEEM, the FM demodulated Sub signal is de-emphasized and the carrier component is removed.
After passing through SUB DEEM, the Sub signal is applied to MATRIX and OUTPUT AMP.
4. MATRIX and output circuits
In MATRIX, the L and R signals are created by adding and subtracting the Main signal from MAIN DEEM
and the Sub signal from SUB DEEM in stereo broadcast.
In OUTPUT AMP and OUTPUT SW, the output signal is switched under the control of Logic.
In addition, MAIN OUT always outputs the MAIN signal component, regardless of the broadcast mode.
5. TONE circuit
Control BASS and TREBLE. Bass and TREBLE characteristics are decided by each CL and CH external
capacitance.
6. BALANCE, VOLUME curcuit
Control BALANCE and VOLUME. BALANCE has 64steps and VOLUME has 256 steps.
7. DAC
DAC is the circuit that control BASS, TREBLE, VOLUME and BALANCE.
Internal impedance is approximately 20kΩ (approximately 5kΩ for VOLUME).
Connect the external capacitance for LPF to each pins.
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