Sony CXA2502M Datasheet

Dolby∗B-C Type Noise Reduction System for Playback

Description

The CXA2502M is a bipolar IC incorporating stereo
Dolby B-C type noise reduction (NR) system for
playback.

Pins of this IC are compatible with those of the
Dolby B type NR ICs CXA1102M/ CXA1552M.

A reduction in the number of external parts and
small package have been achieved due to the fact
that the spectral skewing circuits are all on-chip and
this IC is intended for playback.

Features

• Few external parts

• Spectral skewing circuit are on-chip

• NR OFF/B/C and AUX/TAPE switches

• Small package (16-pin SOP)

• Low current consumption 12mA Typ.

• Built-in two channels

CXA2502M

16 pin SOP (Plastic)

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage VCC 17 V

• Operating temperature Topr –40 to +85 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation

PD 600 (SOP) mW

∗

This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications
information may be obtained.

∗

“Dolby” and the double D symbols are trademarks of Dolby Laboratories Licensing Corporation.

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 –

E95621A5X-PS

CXA2502M

(–6dBm)

LINEOUT1

P13

1µ

C13

C15

C14

TAPE AUXC12

68n

100n

9

TCL1

TCH1

10

LINEOUT1

11

MODE

12

LDET

HDET

LLS

HLS

CC

V

P1

SSK

Mode

Control

SSK

LLS

HLS

LDET

HDET

(–6dBm)

LINEOUT2

P23

8

TCL2

68n

C25

7

TCH2

C24

100n

6

5

LINEOUT2

NRSW

OFF

B

C

C23

1µ

P12

PBIN1

AUXIN1

(–30dBm)

R1

20k

1µ

1µ

C11

P11

(–30dBm)

IREF

13

PBIN1

1415

GND

AUXIN1

16

MOA

IREF

MOA

4

VCT

C1

47µ

3

PBIN2

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for

1µ

C22

2

V

CC

C2

10µ

1

AUXIN2

1µ

C21

P21

PBIN2

AUXIN2

(–30dBm)

P22

(–30dBm)

any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

Block Diagram, Pin Configuration and Application Circuit

– 2 –

Pin Description

Pin
No.

1

16

2

3

14

Symbol Z (in) VDC (V) Equivalent circuit Description

AUX IN

VCC

PB IN

40K

40K

VCT

VCC

VCT

40k

40k

CXA2502M

VCC

VCT

Auxiliary input.
Reference level
= –30dBm

GND

Positive power supply.

VCC

VCT

Playback input.
Reference level
= –30dBm

4

5

6

11

VCT

NRSW

LINE OUT

—

GND

Dual power supply:

0

VCT

Ground
Single power supply:
Vcc/2

VCC

50µA

22k

—

NR control

High: C type
Medium:B type
Low: NR OFF

GND

VCC

200

0

VCT

200

Line output.

– 3 –

GND

CXA2502M

Pin

No.

7

10

8
9

Symbol Z (in) VDC (V) Equivalent circuit Description

VCC

TCH

TCL

—

—

0.4V

0.4V

36k13k

330k

GND

VCC

13.5k

480k

GND

Time constant for the
HLS.

Time constant for the
LLS.

12

13

MODE

IREF

—

VCC

50µA

22k

—

MODE control

High: TAPE
Low: AUX

GND

VCC

Reference current

0

1.25V

1.25V

which determines the
built-in filter cut-off
frequency.

GND

15

GND

GND

Dual power supply:
Negative power supply
Single power supply:
Ground

– 4 –