Sony CXA2021S Datasheet
I2C BUS Sound Processor for TV
Description
The CXA2021S is a bipolar IC developed as an I2C
BUS control sound processor for TV. This IC
implements surround, tone control, balance, volume,
mute and AGC functions.
Features
• I2C BUS control
• The AGC circuit is adopted to absorb volume
differences between input sources and improve the
S/N ratio in hearing.
CXA2021S
22 pin SDIP (Plastic)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltage VCC 14 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation PD 0.9 W
Recommended Operating Condition
Supply voltage 8 to 13 V
Pin Configuration
21
Vcc
20
CL-L
19
CH-L
VRS
18
L-IN
22
Applications
TVs
HPI
17
16
HPO
PS
1415
LOUT
13
DET1
SDA
12
BAL
6
TRE
7
BASS
8
1
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.
R-IN
2
3
GND
4
CL-R
5
CH-R
– 1 –
VOL
9
ROUT
10
DET2
11
SCL
E95319-ST
Block Diagram
150Hz HPF
DET1 DET2
2
C BUS SOUND PROCESSOR
I
Vcc
CH-L
CL-L
Surround
L = L – (L – R) ×
R = R + (L – R) ×
1 – SCR
1 + SCR
1 – SCR
1 + SCR
CXA2021S
R = 18K
22
13
17
16
AGC DET 1 AGC DET 2
L-IN
1
R-IN
Vcc/2
18
10
VRS
GND
21
PS
15
2
PS
19
TONE VCA
BASS
TRE
TONE VCA
4
CL-R
CH-R
20
LOUT
14
VOL
BAL
ROUT
DAC BUS DEC
6
5
3
7
8
12
11
SDA SCL
9
– 2 –
BASS TRE BAL VOL
CXA2021S
Pin Description (Ta = 25°C, VCC = 12V)
Pin No. Symbol Voltage Equivalent circuit Description
Vcc
10µ
10k
130
30k
Vcc
2
22
1
R-IN
L-IN
6V Input pins.
1
22
2 GND 0V GND pin.
Vcc
Pins for connecting external
LPF capacitance (BASS).
Vcc
2
Vcc
20
250µ
3
CL-R
CL-L
6V
3
20
11k
130
250µ
250µ
5.4k
11k
250µ
19
40k
2k
2k
6k
20k
75µ
5.7k
7.5V
Pins for connecting external
HPF capacitance (TREBLE).
DAC output pins.
Connect LPF capacitance
of DAC.
Internal impedance is
approximately 20kΩ.
4
5
6
7
8
CH-R
CH-L
BAL
TRE
BASS
VOL
6V
19
4.5V
5.7k
4
130
Vcc
5
6
7
8
– 3 –
Pin No. Symbol Voltage Equivalent circuit Description
Vcc
5P
CXA2021S
9
14
ROUT
LOUT
10 DET2
10
14
9
130
500 500
84k
Vcc
200200
10k
AGC detector output and
130
100k100k
Vcc
control pin.
6V Output pins.
100µ
50µ
11 SCL I2C bus clock line.
12 SDA I2C bus data line.
11
12
4k
4k
3k11k 56k
4.5k
3k
Vcc
100µ
50µ
56k
– 4 –
Pin No. Symbol Voltage Equivalent circuit Description
Vcc
40k
13
AGC detector output.
13 DET1 7.8V
Connect capacitance for
setting time constant.
2k
Vcc
10µ
Pin for connecting external
capacitance of the surround
phase shifter.
15 PS 6V
18k
130
15
Internal impedance is
18k
approximately 18kΩ.
CXA2021S
Vcc
500
10k
16 HPO 6V AGC HPF output pin.
17 HPI 6V AGC HPF input pin.
16
500
Vcc
10µ
5k
17
130
Vcc
2
16k16k
– 5 –
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