Description
The CXA2021S is a bipolar IC developed as an I
2
C
BUS control sound processor for TV. This IC
implements surround, tone control, balance, volume,
mute and AGC functions.
Features
I
2
C BUS control
The AGC circuit is adopted to absorb volume
differences between input sources and improve the
S/N ratio in hearing.
Absolute Maximum Ratings
Supply voltage
V
CC
14
V
Operating temperature
Topr 20 to +75
C
Storage temperature
Tstg 65 to +150 C
Allowable power dissipation P
D
0.9
W
Recommended Operating Condition
Supply voltage
8 to 13
V
Pin Configuration
Structure
Bipolar silicon monolithic IC
Applications
TVs
1
CXA2021S
E95319-ST
I
2
C BUS Sound Processor for TV
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.
22 pin SDIP (Plastic)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
R-IN
GND
CL-R
CH-R
BAL
TRE
BASS
VOL
ROUT
DET2
SCL
L-IN
Vcc
CL-L
CH-L
VRS
HPI
HPO
PS
LOUT
DET1
SDA
2
CXA2021S
Block Diagram
1
22
L-IN
R-IN
20
19
21
10
13
17
16
AGC DET 1
AGC DET 2
150Hz HPF
DET1
DET2
Vcc
CH-L
CL-L
9
14
LOUT
ROUT
11
12
8
5
6
7
3
4
2
15
18
Vcc/2
VRS
GND
PS
SDA SCL
DAC
BUS DEC
TONE
VCA
TONE
VCA
BASS
TRE
VOL
BAL
PS
BASS TRE BAL VOL
I
2
C BUS SOUND PROCESSOR
Surround
L = L (L R)
1 SCR
1 + SCR
R = R + (L R)
1 SCR
1 + SCR
R = 18K
CH-R CL-R
3
CXA2021S
Pin Description
(Ta = 25C, V
CC
= 12V)
Pin No.
Symbol
Voltage
Equivalent circuit
Description
1
22
R-IN
L-IN
6V
Input pins.
2
GND
0V
GND pin.
1
Vcc
10
10k
30k
130
Vcc
2
22
3
20
CL-R
CL-L
6V
Pins for connecting external
LPF capacitance (BASS).
Vcc
250
11k
130
3
250
11k
5.4k
2
Vcc
20
4
19
CH-R
CH-L
6V
Pins for connecting external
HPF capacitance (TREBLE).
Vcc
250
5.7k
130
250
5.7k
6k
4
19
5
6
7
8
BAL
TRE
BASS
VOL
4.5V
DAC output pins.
Connect LPF capacitance
of DAC.
Internal impedance is
approximately 20k
.
5
6
7
8
7.5V
Vcc
40k
2k
2k
20k
75
4
CXA2021S
9
14
ROUT
LOUT
6V
Output pins.
130
5P
84k
500
500
Vcc
9
14
10
DET2
AGC detector output and
control pin.
Vcc
200
200
130
10k
100k
100k
10
11
SCL
I
2
C bus clock line.
4k
Vcc
100
50
3k
11k
56k
11
12
SDA
I
2
C bus data line.
4k
Vcc
100
50
3k
4.5k
56k
12
Pin No.
Symbol
Voltage
Equivalent circuit
Description
5
CXA2021S
13
DET1
7.8V
AGC detector output.
Connect capacitance for
setting time constant.
13
Vcc
40k
2k
15
PS
6V
Pin for connecting external
capacitance of the surround
phase shifter.
Internal impedance is
approximately 18k
.
Vcc
10
130
18k
18k
15
16
HPO
6V
AGC HPF output pin.
10k
500
500
Vcc
16
17
HPI
6V
AGC HPF input pin.
Vcc
10
130
5k
16k
16k
2
Vcc
17
Pin No.
Symbol
Voltage
Equivalent circuit
Description
6
CXA2021S
18
VRS
6V
V
CC
reference voltage pin.
2
Vcc
30k
1k
30k
16k
16k
30
18
21
V
CC
12V
Power supply pin.
Pin No.
Symbol
Voltage
Equivalent circuit
Description
7
CXA2021S
Control Register Table
SLAVE ADDRESS = 82H
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
VOLUME (00)
MUTE
(0)
AGC
(0)
BASS (00)
MODE
(0)
TREBLE (00)
BALANCE (00)
DATA
AGC:
0 = OFF , 1 = ON
MUTE: 0 = OFF , 1 = ON
(Power-ON setting value)
<Description of registers>
VOLUME: Volume control for both L channel and R channel
00 = minimum value
3F = maximum value
MUTE: MUTE switch
0 = Mute OFF
1 = Mute ON (Mute state)
AGC switch
0 = AGC OFF
1 = AGC ON
BASS: Low-frequency control
00 = Minimum value
10 = Typical value
1F = Maximum value
MODE: Surround switch
0 = Surround OFF
1 = Surround ON
TREBLE: High-frequency control
00 = Minimum value
10 = Typical value
1F = Maximum value
BALANCE: Balance control for L channel and R channel
00 = L channel minimum, R channel maximum
20 = Typical
3F = L channel maximum, R channel minimum
8
CXA2021S
Electrical Characteristics Measurement Circuit
R-IN
C1
4.7
C3
0.1
C5
4700P
C7
4.7
C9
4.7
C11
4.7
C12
4.7
C16
10
ROUT
C14
10
SCL
R6
220
R5
1MEG
SDA
R7
220
C17
4.7
C15
10
LOUT
C13
10
C10
0.1
C8
47
C6
4700P
C4
0.1
C2
4.7
L-IN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
R-IN
GND
CL-R
CH-R
BAL
TRE
BASS
VOL
ROUT
DET2
SCL
L-IN
Vcc
CL-L
CH-L
VRS
HPI
HPO
PS
LOUT
DET1
SDA
CXA2021S
R2
10k
R1
10k
R3
10k
R4
10k
PS
ON
S1
TP-PS
9
CXA2021S
Application Circuit
R-IN
C1
4.7
C3
0.1
C5
4700P
C7
4.7
C9
4.7
C11
4.7
C12
4.7
C16
10
ROUT
C14
10
SCL
R2
220
R1
1MEG
SDA
R3
220
C17
4.7
C15
10
LOUT
C13
0.1
C10
0.1
C8
47
C6
4700P
C4
0.1
C2
4.7
L-IN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
R-IN
GND
CL-R
CH-R
BAL
TRE
BASS
VOL
ROUT
DET2
SCL
L-IN
Vcc
CL-L
CH-L
VRS
HPI
HPO
PS
LOUT
DET1
SDA
CXA2021S
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
10
CXA2021S
No.
Measurement item
Symbol
Input conditions
VOL
MUTE
AGC
BASS
MODE
TRE
BAL
Input
point
Input
signal
SW set
to ON
Measure
-ment
point
Remarks
Min.
Typ.
Max.
Unit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Current
consumption
FLAT
L, R
REF, Level
L, R
VOL MIN
L, R
FLAT frequency
response 100Hz
FLAT frequency
response 10kHz
BASS BOOST
100Hz
TREBLE
BOOST
10kHz
BASS CUT
100Hz
TREBLE CUT
10kHz
BALANCE
BOOST L
BALANCE
CUT L
BALANCE
BOOST R
BALANCE
CUT R
I
CC
V
F L, R
V
R L, R
V
MIN L, R
V
LF L, R
V
HF L, R
V
BST LF
V
BST HF
V
CUT LF
V
CUT HF
V
BAL BST L
V
BAL CUT L
V
BAL BST R
V
BAL CUT R
3F
20
0
20
0
0
10
1F
0
10
0
10
1F
0
10
20
3F
0
3F
L-IN
R-IN
1kHz
2.4Vrms
100Hz
2.4Vrms
10kHz
2.4Vrms
100Hz
2.4Vrms
10kHz
2.4Vrms
100Hz
2.4Vrms
10kHz
2.4Vrms
1kHz
2.4Vrms
LOUT
ROUT
LOUT
ROUT
REF: INPUT
REF: V
R L, R
16
2.0
17
--
1.5
1.5
8.5
8.5
13.5
13.5
0
--
0
--
31
0
14
--
0
0
11
11
11
11
1.2
--
1.2
--
50
2.0
11
70
1.5
1.5
13.5
13.5
8.5
8.5
2.0
30
2.0
30
mA
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Electrical Characteristics
(Ta = 25C, V
CC
= 12V)
11
CXA2021S
No.
VOL
MUTE
AGC
BASS
MODE
TRE
BAL
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Distortion
L, R
Mute L, R
Cross-Talk L
R
Cross-Talk R
L
NOISE
LEVEL L, R
AGC
BOOST L, R
AGC
BOOST2 L, R
AGC
NULL L, R
AGC
CUT L, R
SS DIF
GAIN L
SS DIF
GAIN R
SS MIX
LEVEL L
SS MIX
LEVEL R
DC OFF-Set 1
Vdist
V
MT L, R
V
CT L, R
V
CT R, L
V
NOI L, R
V
GCB L, R
V
GCB2 L, R
V
GCN L, R
V
GCC L, R
S
DG L
S
DG R
S
MX L
S
MX R
DO1
3F
0
1
0
0
0
1
0
1
0
1
0
1
0
10
10
0
0
1
0
10
20
L-IN
R-IN
L-IN
R-IN
L-IN
R-IN
L-IN
R-IN
PS
1kHz
2.4Vrms
1kHz
10mVrms
1kHz
50mVrms
1kHz
160mVrms
1kHz
2Vrms
1kHz
2.5Vrms
1kHz
1.25Vrms
S1
LOUT
ROUT
ROUT
LOUT
LOUT
ROUT
TP-PS
LOUT
ROUT
LOUT
ROUT
REF:INPUT
REF: V
FR
REF: V
FL
30kHz LPF
REF: AGC-OFF
(0)
REF: AGC-OFF
(0)
REF: AGC-OFF
(0)
REF: AGC-OFF
(0)
--
--
--
--
--
0
5
2.5
24
2
2
3
3
1
--
--
--
--
--
2.5
7
0.5
20
0
0
6
6
0
2.0
70
70
70
60
5
10
2
16
2
2
9
9
1
%
dB
dB
dB
dBm
dB
dB
dB
dB
dB
dB
dB
dB
V
Measurement item
Symbol
Input conditions
Input
point
Remarks
Min.
Typ.
Max.
Unit
Input
signal
SW set
to ON
Measure
-ment
point
12
CXA2021S
No.
VOL
MUTE
AGC
BASS
MODE
TRE
BAL
29
30
31
32
33
DC OFF-Set 2
DC OFF-Set 3
DC OFF-Set 4
DC OFF-Set
OFF
SS
VOL MIN
NOISE L, R
DO2
DO3
DO4
DO
SS L, R
V
MINNO L, R
3F
0
0
0
10
1F
10
0
0
1
0
10
10
0
10
1F
10
20
LOUT
ROUT
REF: MODE 0
30kHz LPF
1
1
1
150
--
0
0
0
0
92
1
1
1
150
85
V
V
V
mV
dBm
Measurement item
Symbol
Input conditions
Input
point
Remarks
Min.
Typ.
Max.
Unit
Input
signal
SW set
to ON
Measure
-ment
point
13
CXA2021S
<Description of Operations>
AGC circuit
The AGC circuit is incorporated in the input block. When AGC is turned ON, gain is 0dB for small signal
input, boosted for medium signal input and reduced for large signal input. The AGC circuit can absorb
volume differences between input sources.
Surround circuit
L-R signals passing through the phase shifter are added to L channel and R channel each in the opposite
phase. The transfer function of the phase shifter is obtained by the following equation:
V
O
= Vin
where R is internal resistance
18k
and C is external capacitance.
TONE circuit
BASS and TREBLE tone control. BASS control characteristic can be determined by external capacitance
connected to C
L
, and TREBLE control characteristic by external capacitance connected to C
H
. Tone control
can be performed in 32 steps.
BALANCE and VOLUME circuits
Controls BALANCE and VOLUME in 64 steps each.
DAC
DAC circuit for controlling BASS, TREBLE, VOLUME and BALANCE. Internal impedance is approximately
20k
. Connect external capacitance for LPF.
1 SCR
1 + SCR
14
CXA2021S
TONE characteristic
100
1k
10k
20
10
0
10
20
OUT L, R [dB]
BASS-TREBLE MAX.
BASS-TREBLE MIN.
Frequency [Hz]
CH. vs. TREBLE-CONTROL (MAX)
10
1k
10k
2.5
0.0
12.5
15.0
17.5
OUT L, R [dB]
Frequency [Hz]
2.5
5.0
7.5
10.0
100
100k
CL. vs. BASS-CONTROL (MAX)
10
1k
10k
2.5
0.0
12.5
15.0
17.5
OUT L, R [dB]
Frequency [Hz]
2.5
5.0
7.5
10.0
100
100k
0.047
2200p
470p
4700p
0.047
0.022
0.47
1
0.01
0.1
15
CXA2021S
10
20
30
3F
80
70
60
50
40
30
20
10
0
VOL CONTROL characteristic
BUS Data [VOL]
OUT L, R [dB]
10
20
30
3F
80
70
60
50
40
30
20
10
0
BALANCE CONTROL characteristic
BUS Data [BALANCE]
OUT L, R [dB]
0
OUT R
OUT L
Input = 10kHz
12
10
8
6
4
2
0
2
4
6
8
10
12
0
4
8
C
10
14
18
1C 1F
TREBLE CONTROL characteristic
BUS Data [TREBLE]
OUT L, R [dB]
Input = 100Hz
12
10
8
6
4
2
0
2
4
6
8
10
12
0
4
8
C
10
14
18
1C 1F
BASS CONTROL characteristic
BUS Data [BASS]
OUT L, R [dB]
10
100mV
1V
10
100mV
1V
OUT [rms]
IN [rms]
AGC characteristic
AGC = OFF
AGC = ON
16
CXA2021S
Package Outline
Unit: mm
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE STRUCTURE
MOLDING COMPOUND
LEAD TREATMENT
LEAD MATERIAL
PACKAGE WEIGHT
EPOXY RESIN
SOLDER PLATING
COPPER ALLOY
22PIN SDIP (PLASTIC)
SDIP-22P-01
SDIP022-P-0300
0.95g
1.778
11
12
1
22
19.2 0.1
+ 0.4
7.62
6.4 0.1
+ 0.3
0.25 0.05
+ 0.1
0 to 15
0.5 0.1
0.9 0.1
+ 0.15
3.25 0.2
+ 0.15
0.51 MIN
3.9 0.1
+ 0.4
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