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PDF CXA2074S Data sheet ( Hoja de datos )
| Número de pieza | CXA2074S | |
| Descripción | US Audio Multiplexing Decoder | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA2074Q/S
US Audio Multiplexing Decoder
Description
The CXA2074Q/S is an IC designed as a decoder
for the Zenith TV Multi-channel System and also
corresponds with I2C BUS. Functions include stereo
demodulation, SAP (Separate Audio Program)
demodulation, dbx noise reduction and sound
processor. Various kinds of filters are built in while
adjustment, mode control and sound processor
control are all executed through I2C BUS.
Features
• Audio multiplexing decoder, dbx noise reduction
decoder and sound processor are all included in a
single chip. Almost any sort of signal processing is
possible through this IC.
• All adjustments are possible through I2C BUS to
allow for automatic adjustment.
• Various built-in filter circuits greatly reduce external
parts.
• There are three systems for inputs and two
systems for outputs, and each mode control is
possible.
Standard I/O Level
[( ) is the pin No. for the CXA2074S.]
• Input level
COMPIN (Pin 17)
245mVrms
AUX1-L/R (Pins 36 and 35) 490mVrms
AUX2-L/R (Pins 38 and 37) 490mVrms
• Output level
LPOUT-L/R (Pins 40 and 39) 490mVrms
LSOUT-L/R (Pins 8 and 7)
490mVrms
CXA2074Q
48 pin QFP (Plastic)
CXA2074S
42 pin SDIP (Plastic)
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
VCC 11
V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 0.6 (48 pin QFP) W
2.2 (42 pin SDIP) W
Range of Operating Supply Voltage
9 ± 0.5
V
Applications
TV, VCR and other decoding systems for US audio
multiplexing TV broadcasting
Structure
Bipolar silicon monolithic IC
∗ A license of the dbx-TV noise reduction system is
required for the use of this device.
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
–1–
E96843B86
1 page  
Pin Description
Pin No.
QFP SDIP
Symbol
Pin
voltage
44 1 BASSR1 4.0V
(45) 2
45 2 BASSR2 4.0V (47) 4
46 3 BASSL1 4.0V
47 4 BASSL2 4.0V
CXA2074Q/S
Equivalent circuit
3k
4.2k
3.4k
2.7k
2.2k
1.8k
1.4k
1.2k
4.9k
4V
190
190
Description
BASS filter pin. (Right channel)
VCC (Connect a 47nF capacitor
between Pins 1 and 2 (44
and 45).)
The cutoff frequency is
determined by the built-in
resistor and the external
capacitance.
VCC
1 (44)
3 (46)
BASS filter pin. (Left channel)
(Connect a 47nF capacitor
between Pins 3 and 4 (46
and 47).)
The cutoff frequency is
determined by the built-in
resistor and the external
capacitance.
48 5 TRER 4.0V
1 6 TREL 4.0V
VCC
(48) 5
(1) 6
3k
580
4.2k 580
3.4k
2.7k
2.2k
1.8k
1.4k
1.2k
4.9k
VCC
TREBLE filter pin.
(Right channel)
(Connect a 6.8nF capacitor
between this pin and GND.)
TREBLE filter pin.
(Left channel)
(Connect a 6.8nF capacitor
between this pin and GND.)
2 7 LSOUT-R 4.0V
3 8 LSOUT-L 4.0V
VCC
VCC
3k
(2) 7
(3) 8
580
580
–5–
LSOUT right channel output
pin.
LSOUT left channel output
pin.
5 Page 
CXA2074Q/S
Pin No.
QFP SDIP
Symbol
Pin
voltage
31 32 VCAIN 4.0V
Equivalent circuit
VCC
47k
20k
VCC
47k
32
(31)
Description
VCA input pin.
Input the variable
de-emphasis output signal
from Pin 31 (30) via a
coupling capacitor.
32 33 VCATC 1.7V
×4
×4
VCC
33
(32)
↓
4k
↓
20k
50µ 7.5µ
Determine the restoration
time constant of the VCA
control effective value
detection circuit.
(The specified restoration
time constant can be
obtained by connecting a
10µF capacitor between this
pin and GND.)
33 34 VCAWGT 4.0V
40k 40k 3p
VCC
2.9V
36k
↓ 4k ↓ 30k
50µ 8µ
580
580 147
34
(33)
8k
Weight the VCA control
effective value detection
circuit.
(Connect a 1µF capacitor
and a 3.9kΩ resistor in series
between this pin and GND.)
35 35 AUX1-R 4.0V
36 36 AUX1-L 4.0V
37 37 AUX2-R 4.0V
38 38 AUX2-L 4.0V
10k
147
27.5k
47k
4V
VCC
35
36
37
38
Right channel external input
1 pin.
Left channel external input
1 pin.
Right channel external input
2 pin.
Left channel external input
2 pin.
– 11 –
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CXA2074S.PDF ] | |
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