Sony CXA1842S Datasheet

3-Mode Surround and Vocal Cancellation

Description

The CXA1842S is a bipolar IC which combines 3­mode 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

Absolute Maximum Ratings (Ta=25°C)

• Supply voltage VCC 14 V

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation

Recommended Operating Conditions

Supply voltage VCC 5 to 12 V

CXA1842S

22 pin SDIP (Plastic)

PD 880 mW

Block Diagram and Pin Configuration

Lch IN

LPF L1

LPF L2

REF

REF

LPF L3

VCA

DET

DET L

VCA

DET

DET

VCA

S5

S5

SW CONT

GND

Vcc

Vcc

S4

S4

R2

R1

Lch OUT

12131415161718202122 19

REF

DET R

S6

S6

–6

S1

PSN1

S2

PSN2

S.S

S3

1 2 3 4 5 6 7 8 9

Rch IN

LPF R1

LPF R2

LPF R3

V.C

DET V.C

B.B

SW1

SW2

10 11

REF

Rch OUT

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.

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E93702-TE

CXA1842S

Pin Description (VCC=10V, Ta=25°C)

Pin

Symbol

No. Voltage

Pin

1 Rch IN

5.0V

22 Lch IN

2 LPF R1

21 LPF L1

3 LPF R2

20 LPF L2 5.0V

21

Equivalent Circuit Description

22

Channel L

VCC

1

129

56K

AGND

GND

Channel R

input pin

Time constants for L.P.F.

32K

64K

2

3

80K

AGND

4 LPF R3

19 LPF L3

5 DET V.C

17 DET R 0.5V

18 DET L

17
18

20

4

19

Level detector pin.

VCC

To be connected with a
capacitor

5

129

100K

5K

500

200

200

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CXA1842S

Pin

No. Voltage

Symbol

Pin

6 V.C

7 B.B

—

8 SW 1

9 SW 2

10 REF 5.0V

10

Equivalent Circuit Description

VCC

SW is turned ON when this
pin is connected to GND

VCC

6
7
8
9

129

V

CC

AGND

Reference voltage
(1/2 VCC)

48K

48K

AGND

11 Rch OUT

5.0V

12 Lch OUT

13 Vcc 10V

14 GND 0

15 PSN 2

5.0V

15

11

12

VCC

129

GND

297

297

VCC

Channel R
Channel L

output pin

Power supply

GND pin
The pin to be connected with

a capacitor for time constants
of phase shift

16 PSN 1

16

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