CXA1518S Просмотр технического описания (PDF) - Sony Semiconductor
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CXA1518S Datasheet PDF : 20 Pages
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CXA1518Q/S
Output and LED ON/OFF Table
Broadcast
status
Stereo
Bilingual
MODE SW
SUB BOTH MAIN
×
×
×
×
×
×
×
×
×
on
on
on
×
×
×
×
×
×
Monaural
×
×
×
× : No response
Forced
monaural
off
on
×
off
off
off
on
×
×
×
MUTE
Output status
LED ON/OFF conditions
L
R MAIN STEREO SUB MAIN
off
L
R L+R on
off
off
off
L+R L+R L+R off
off
off
on
DC DC DC
off
off
off
off
SUB SUB MAIN off
on
off
off
MAIN SUB MAIN off
on
on
off
MAIN MAIN MAIN off
off
on
off
MAIN MAIN MAIN off
off
off
on
DC DC DC
off
off
off
off MONO MONO MONO off
off
off
on
DC DC DC
off
off
off
Control Voltage Range
MODE SW
Pin 12
(Pin 14)
FORCED
MONO
Pin 14
(Pin 16)
SUB
BOTH
MAIN
on
off
Pin numbers in brackets are for the CXA1518Q.
Voltage range
4.0 V to VCC
2 V to 3 V
0 V to 0.5 V
3 V to VCC
0 V to 0.5 V (or OPEN)
MUTE
Pin 13
(Pin 15)
on
3 V to VCC
off 0 V to 0.5 V (or OPEN)
Description of Operation Pin numbers in brackets are for the CXA1518Q.
The sound multiplexing signal input from Pin 6 (Pin 3) passes through IN AMP, and is added to the Cue BPF,
SUB BPF and the MAIN de-emphasis circuits.
1 Discrimination system
The Cue BPF passes only the Cue signal component of the multiplexing signal. The AM demodulator
detects the amplitude modulation of the Cue signal (AM wave) and generates a sine wave of either 922.5
Hz (for bilingual) or 982.5 Hz (for stereo sound).
COMP shapes the carrier-stripped Cue signal into a waveform, transforming it into pulses of either 922.5
Hz or 982.5 Hz, after which it is added to the LOGIC unit.
A 3.5fH VCO generates a 3.5fH pulse locked to the Cue signal carrier wave (3.5fH), and sends it to the
LOGIC unit.
The LOGIC unit performs broadcast mode discrimination using the countdown method. From this result,
and the existence/absence of a SUB signal from the SUB Detector, MUTE ON/OFF from CONT, MODE
Switch, and the FOMO ON/OFF commands, the logic unit generates an output switchover control signal to
control the output statuses of OUTPUT SW and MAIN OUT.
—14—
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