CXA1842S
3-Mode Surround and Vocal Cancellation
Description
The CXA1842S is a bipolar IC which combines 3-
mode surround, bass boosting and vocal
cancellation function into a single chip.
Features
•
3-mode surround (surround A, surround B,
simulated stereo)
•
Vocal cancellation function
•
Bass boosting function
Applications
CD Radio-cassette tape recorders, equipment with
Karaoke functions
Structure
Bipolar silicon monolithic IC
22 pin SDIP (Plastic)
Absolute Maximum Ratings
(Ta=25°C)
•
Supply voltage
V
CC
14
•
Operating temperature Topr –20 to +75
•
Storage temperature
Tstg –65 to +150
•
Allowable power dissipation
P
D
880
V
°C
°C
mW
Recommended Operating Conditions
Supply voltage
V
CC
5 to 12
V
Block Diagram and Pin Configuration
LPF L1
Lch OUT
12
S4
REF
S6
VCA
S5
S4
REF
11
LPF L2
LPF L3
DET L
DET R
Lch IN
PSN1
PSN2
GND
22
21
20
19
18
17
16
15
14
13
DET
DET
S2
S.S
VCA
S6
REF
Vcc
S3
VCA
DET
–6
S5
S1
SW CONT
R2
R1
1
Rch IN
2
LPF R1
3
LPF R2
4
LPF R3
5
DET V.C
6
V.C
7
B.B
8
SW1
9
SW2
10
Vcc
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—
Rch OUT
REF
E93702-TE
CXA1842S
Pin
No.
Symbol
Pin
Voltage
Equivalent Circuit
V
CC
Description
SW is turned ON when this
pin is connected to GND
6
7
8
9
V.C
B.B
—
SW 1
SW 2
6
129
AGND
V
CC
7
8
9
V
CC
48K
10
Reference voltage
(1/2 V
CC
)
10
REF
5.0V
48K
AGND
GND
V
CC
Channel R
output pin
Channel L
11 Rch OUT
5.0V
11
129
297
12
Lch OUT
297
12
13
14
Vcc
GND
10V
0
Power supply
GND pin
The pin to be connected with
a capacitor for time constants
of phase shift
V
CC
15
PSN 2
5.0V
15
16
16
PSN 1
—3—
CXA1842S
Electrical Characteristics
No.
1
2
3
4
5
6
Item
No signal current
Lch gain
Rch gain
Channel balance
Lch total harmonic distortion
Rch total harmonic distortion
Conditions
Vin=GND
Vin=2Vrms, f=1kHz
↓
Lch gain - Rch gain
Vin=2Vrms, f=1kHz
↓
Vin=GND
↓
Vin=2Vrms, f=1kHz
SW conditions
S1 S2 S3 S4 S5 S6
O
O
O
O
O
— — — — — —
O
O
O
O
O
O
O
O
(V
CC
=10V, Ta=25°C)
Min. Typ. Max. Unit
1.6
-3
-3
-3
—
—
—
—
55
3.35
0
0
0
0.07
0.07
- 90
- 90
63
5.1
3
3
3
0.1
mA
dB
dB
dB
%
S7
O
—
O
O
O
7 Lch noise level
8 Rch noise level
9 Channel separation
0.1
%
- 80 dBm
- 80 dBm
—
dB
O...indicates “ON”.
Electrical Characteristics Measurement Circuit
C2
2200p
C11
0.01µ
0.1µ
C6
10µ
C15
10µ
C10
10µ
C4
C8
C9
10V
0.022µ
20
19
22
21
18
17
16
15
14
V1
10µ
10µ
12
13
DET L
DET R
Lch IN
PSN1
LPF L1
PSN2
LPF L2
GND
LPF L3
Vcc
S5
Lch OUT
10k
S7
S6
R4
C12
LPF R2
SW1
1
C3
C1
10µ
2
0.1µ
3
C5
4
C7
5
10µ
S3
6
S4
B.B
7
S1
8
S2
9
C13
10
Rch OUT
LPF R1
Rch IN
DET V.C
V
IN
V
LPF R3
SW2
V.C
REF
11
C14
0.022µ
10µ
—4—
10k
R3
10µ
CXA1842S
Application Circuit
GND
C2
C12
10µ
Vcc
C15
10µ
2200p
C10
10µ
22
0.022µ
20
19
21
18
17
16
C11
15
0.01µ
14
0.1µ
C6
10µ
10µ
C4
C8
C9
13
12
Lch IN
GND
Rch IN
CXA1842S
Lch OUT
GND
Rch OUT
1
C3
C1
10µ
2
0.1µ
3
C5
4
C7
5
SW3
10µ
6
SW4
7
SW1
8
SW2
9
C13
10
11
C14
10µ
0.022µ
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.
Mode Switch Correspondence
No.
1
2
3
4
5
MODE
Simulated Stereo
Surround A
Surround B
Pass
Vocal cancel
SW1
ON
ON
OFF
OFF
—
SW2
ON
OFF
ON
OFF
—
SW3
ON
ON
ON
ON
OFF
—...don't care
Bass boosting ON when SW4=ON (Invalid during vocal cancellation)
V
TH
for SW ... V
TH (H)
= V
CC
to 3 V, V
TH (L)
= 2 V to GND
—5—
10µ
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