Sony CXA2510AQ Datasheet

Dolby∗B Type Noise Reduction System with Playback Equalizer Amplifier

Description

The CXA2510AQ is an IC designed for use in car stereo cassette decks. Functions include Dolby B type noise reduction (NR) system, playback equalizer amplifier and music sensor into a single chip.

Features

• Few external parts

• Small package (40-pin QFP)

• Same pin configuration as for the Dolby B-C type

NR system (CXA2511AQ) and no Dolby NR

system (CXA2509AQ)

• Dolby B type NR and playback equalizer amplifier

into a single chip

• FORWARD/REVERSE head select switch

• Two-system (TAPE/AUX) input select switch

• Music signal interval detection level can be set by

the external resistors/capacitors (2 modes).

• High-frequency cut-off of the music sensor circuit

can be adjusted by the external capacitance.

CXA2510AQ

40 pin QFP (Plastic)

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings

• Supply voltage VCC 12 V

• Operating temperature Topr –40 to +85 °C

• Storage temperature Tstg –65 to +150 °C

• Power dissipation PD 430 mW

Operating Condition

Supply voltage VCC 7.8 to 11 V

Applications

• Car stereo cassette decks

• Playback-only cassette decks

∗

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 –

E96827-PS

Block Diagram and Pin Configuration

CXA2510AQ

PBFB2

PBRIN2

PBREF2

PBFIN2

VCT

PBGND

PBFIN1

PBREF1

PBRIN1

PBFB1

31

32

33

34

35

36

37

38

39

40

PBEQ2

30

VCT

PBOUT2

29

F2

F1

GND

28

120µ/70µ

TAPEIN2

27

× 1

26

T2

T1

AUXIN2

25

TAPE/AUX

LPF

DIREF

24

NR BIAS

TAPE EQ

FWD/RVS

VCC

F3

LINEOUT2

TCH2

23

NR

OFF/

B

OFF/

B

NR

NC

21

22

MS MODE

NR MODE

MS ON/

OFF

DET

MSSW

20

19

18

17

16

15

14

13

12

11

MSMODE

DRSW

TAPESW

INSW

NRSW

NC

MSOUT

DGND

MSTC

G1FB

1

PBEQ1

2

PBOUT1

4

3

CC

V

AUXIN1

TAPEIN1

7

MSLPF

LINEOUT1

6

5

8

TCH1

9

10

NC

G2FB

– 2 –

CXA2510AQ

Pin Description (Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)

No.

1

30

2

29

Symbol

PBEQ1 PBEQ2

PBOUT1 PBOUT2

Typical pin voltage

DC AC

4.0V —

4.0V –25dBm

I/O

resistance

O—

30

Equivalent circuit Description

Vcc

40k

1k

1

1k

5k

Resistance for selecting the playback equalizer amplifier time constant

GND

Vcc

Playback equalizer amplifier output

29

200

2

200

GND

3

VCC — — Power supply

4

TAPEIN1

27

TAPEIN2

5

AUXIN1

26

AUXIN2

MSLPF — 100kΩ

6

8.0V —

4.0V –30dBm

4.0V

—

I 40kΩ

27

26

Vcc

TAPE input

4

147

5

40k

20p

External input

VGS

100k

6

147 64p

GND

Vcc

Cut-off frequency adjustment of the music sensor LPF

– 3 –

GND

CXA2510AQ

Pin No.

Symbol

724LINEOUT1

LINEOUT2

823TCH1

TCH2

Typical pin voltage

DC AC

4.0V –6dBm

0.3V —

I/O

resistance

O — Line output

——

23

Equivalent circuit Description

Vcc

200

147

7

24

147

8

330k

200

22.5k

GND

Vcc

36k

Time constant for the HLS

1011G2FB

G1FB

12 MSTC — —

4.0V —

——

10

11

12

147

853

10k

500

GND

Vcc

Music signal interval detection level setting

GND

Vcc

Time constant for detecting the music signal interval

13 DGND — —

0.0V —

DGND

GND

Logic ground (Connect to GND.)

– 4 –

CXA2510AQ

Pin No.

Symbol

Typical pin voltage

DC AC

I/O

I/O resistance

0.2V when a signal is

14 MSOUT O —

detected; DVcc

—

when no signal is detected

17

INSW

0.0V when

—

I

100kΩ

open

21

MSSW

17

Equivalent circuit Description

Vcc

DVcc

100k

14

21

DGND

1.1k

100k

GND

Vcc

DGND

GND

Time constant for detecting the music signal interval

Line amplifier input select control Low (open):

TAPEIN

High: AUXIN Music sensor

control Low (open):

MS ON

High: MS OFF

16 NRSW

0.0V

18 TAPESW

when

—

I 100kΩ

open

19 DRSW

0.0V

20 MSMODE I 100kΩ

when

—

open

20

16 18 19

1.1k

100k

1.1k

100k

Vcc

DGND

GND

Vcc

DGND

Dolby NR control Low (open):

NR OFF

High: NR ON Playback equalizer

amplifier control Low (open): 120µs High: 70µs

Head select control Low (open):

FORWARD

High: REVERSE

Music sensor mode control Low (open): G1 High: G2

– 5 –

GND

CXA2510AQ

Pin No.

Symbol

Typical pin voltage

DC AC

I/O

I/O resistance

Equivalent circuit Description

Vcc

Resistance for setting the Dolby NR reference current

25 DIREF — —

1.2V —

25

147

(Connects 18kΩ between DIREF pin and GND for the standard setting.)

GND

28 GND — — Ground

31

PBFB2

40

PBFB1

3239PBRIN2

PBRIN1

3437PBFIN2

PBFIN1

0.0V —

4.0V –70dBm

I—

32 39 34 36

PBREF PBREF

Vcc

50p50p

GND

Playback equalizer amplifier feedback

Playback equalizer amplifier

31

input (REVERSE

40

head connected)

Playback equalizer amplifier input (FORWARD head connected)

3338PBREF2

PBREF1

4.0V —

O—

– 6 –

33 38

200

Vcc

Playback equalizer amplifier reference (Vcc/2 output)

GND

CXA2510AQ

No.

Symbol

35 VCT O —

PBGND — —

36

Typical pin voltage

DC AC

4.0V —

0.0V

—

I/O

I/O resistance

Equivalent circuit Description

Vcc

30k

147

35

45k

VGS

× 1

30k

GND

9

NC — — No connected

15

——

22

Center (Vcc/2 output)

Playback equalizer amplifier ground (Connect to ground.)

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