CXA2074Q/S View Datasheet(PDF) - Sony Semiconductor
Part Name
Description
Manufacturer
CXA2074Q/S Datasheet PDF : 38 Pages
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Description of Operation [The pin numbers in parenthesis are for the CXA2074Q.]
The US audio multiplexing system possesses the base band spectrum shown in Fig. 1.
PEAK DEV
kHz
50
AM-DSB-SC
50
CXA2074Q/S
25
25
L+R 5
50 – 15kHz
fH
L-R
dbx-TV
NR
SAP
dbx-TV NR
FM 10kHz
50 – 10kHz
2fH
3fH
4fH
5fH
Fig. 1. Base band spectrum
15
TELEMETRY
FM 3kHz
3
6fH 6.5fH f
fH = 15.734kHz
(COMPIN)
17
(14)
MVCA
PLL
(VCO 8fH)
2fHL0°
fHL90°
fHL0°
PILOT
DET
I2C BUS
DECODER
MODE
CONTROL
STEREO LPF
SAP BPF
MAIN LPF DE.EM (MAIN OUT)
(MAIN IN)
PILOT
CANCEL
L-R (DSB)
DET
SAP(FM)
DET
SUB LPF
SAP LPF
13
12
(9) 4.7µ (8)
L+R
WIDEBAND
(SUBOUT) (ST IN)
SUBVCA
23
24
(21) 4.7µ (22)
L–R
NR SW
A
(SAP OUT)
INJ.
LOCK
26
(24)
(SAP IN)
NOISE
DET
I2C BUS
27
DECODER 4.7µ (25)
SAP
DET
I2C BUS
DECODER
MODE
CONTROL
dbx-TV
BLOCK
MATRIX
(Lch)
to
B
(Rch) TVSW
MODE
CONTROL
Fig. 2. Overall block diagram (See Fig. 3 for the dbx-TV block)
(ST IN)
(22) 24
(SAP IN)
(25) 27
FIXED
VARIABLE
NR SW A DEEMPHASIS DEEMPHASIS (VE OUT) (VCA IN)
31
32
VCA
(30) 4.7µ (31)
HPF
LPF
RMS
DET
LPF
RMS
DET
B
to
MATRIX
Fig 3. dbx-TV block
– 22 –
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