Sony CXA2511AQ Datasheet

– 1 –

CXA2511AQ

E96828-PS

Dolby∗B-C Type Noise Reduction System with Playback Equalizer Amplifier

Description

The CXA2511AQ is an IC designed for use in car stereo cassette decks. Functions include Dolby B-C 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 type NR

system (CXA2510AQ) and no Dolby NR system

(CXA2509AQ)

• Dolby B-C 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.

Applications

• Car stereo cassette decks

• Playback-only cassette decks

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

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.

40 pin QFP (Plastic)

∗

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.

– 2 –

CXA2511AQ

Block Diagram and Pin Configuration

NR BIAS

FWD/RVS

× 1

NR

TAPE/AUX

TAPE EQ

MS MODE

NR MODE

DET

NR

LPF

× 1

VCT

VCC

OFF/

B/C

T2

MS ON/

OFF

F3

T1

OFF/

B/C

F2

F1

21

22

23

24

25

26

27

28

29

30

40

39

38

37

36

35

34

31

32

33

11

12

13

14

15

16

17

18

19

20

2

3

4

5

6

7

8

9

10

1

PBFB2

PBRIN2

PBREF2

PBFIN2

VCT

PBGND

PBFIN1

PBREF1

PBRIN1

PBFB1

PBEQ2

PBOUT2

TAPEIN2

GND

AUXIN2

DIREF

TCH2

LINEOUT2

TCL2

MSSW

MSMODE

DRSW

TAPESW

INSW

NRSW

NRMODE

MSOUT

DGND

MSTC

G1FB

PBEQ1

PBOUT1

TAPEIN1

V

CC

AUXIN1

MSLPF

TCH1

LINEOUT1

TCL1

G2FB

120µ/70µ

– 3 –

CXA2511AQ

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

1

30

PBEQ1 PBEQ2

O —

Resistance for selecting the playback equalizer amplifier time constant

4.0V —

30

1

GND

1k

40k

1k

5k

Vcc

2

29

PBOUT1 PBOUT2

O —

Playback equalizer amplifier output

4.0V –25dBm

3

VCC — —

Power supply

8.0V —

2

29

GND

200

Vcc

4

27

TAPEIN1 TAPEIN2

I 40kΩ

TAPE input

5

26

AUXIN1 AUXIN2

External input

4.0V –30dBm

4

5

26

27

GND

147

40k

Vcc

VGS

20p

6

MSLPF

— 100kΩ

Cut-off frequency adjustment of the music sensor LPF

4.0V

—

6

GND

147

Vcc

64p

100k

Pin No.

Symbol

Typical pin voltage

I/O

I/O resistance

Equivalent circuit Description

DC AC

– 4 –

CXA2511AQ

724LINEOUT1

LINEOUT2

O — Line output

4.0V –6dBm

823TCH1

TCH2

— —

Time constant for the HLS

0.3V —

922TCL1

TCL2

— —

Time constant for the LLS

0.3V —

1011G2FB

G1FB

— —

Music signal interval detection level setting

4.0V —

13

DGND

—

Logic ground (Connect to GND.)

0.0V —

7

24

GND

200

Vcc

22.5k

147

23

GND

36k

330k

Vcc

147

8

22

GND

13.5k

480k

Vcc

147

9

11

GND

500

Vcc

147

10

500

Pin No.

Symbol

Typical pin voltage

I/O

I/O resistance

Equivalent circuit Description

DC AC

– 5 –

CXA2511AQ

12 MSTC — —

Time constant for detecting the music signal interval

— —

12

GND

147

10k

Vcc

DGND

853

14 MSOUT O —

Music sensor output

0.2V when a signal is detected; DVcc when no signal is detected

—

GND

147

Vcc

DGND

14

DVcc

100k

15 NRMODE

I 100kΩ

Dolby NR mode control Low (open):

Dolby B type NR

High: Dolby C type NR

17 INSW

Line amplifier input select control Low (open): TAPEIN High: AUXIN

21 MSSW

Music sensor control Low (open):

MS ON

High: MS OFF

16 NRSW

Dolby NR control Low (open):

NR OFF

High: NR ON

18 TAPESW

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

19 DRSW

Head select control Low (open):

FORWARD

High: REVERSE

0.0V when open

—

15

21

GND

100k

Vcc

1.1k

DGND

17

I 100kΩ

0.0V when open

—

16

19

GND

100k

Vcc

1.1k

DGND

18

Pin No.

Symbol

Typical pin voltage

I/O

I/O resistance

Equivalent circuit Description

DC AC

– 6 –

CXA2511AQ

20 MSMODE I 100kΩ

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

0.0V when open

—

GND

100k

Vcc

1.1k

DGND

20

25 DIREF — —

Resistance for setting the Dolby NR reference current (Connects 20kΩ between DIREF pin and GND for the standard setting.)

1.2V —

Vcc

147

25

GND

40

36

34

31

32

Vcc

GND

39

PBREF PBREF

50p50p

28 GND — — Ground

0.0V —

31

40

PBFB2 PBFB1

I —

Playback equalizer amplifier feedback

4.0V –70dBm

3239PBRIN2

PBRIN1

Playback equalizer amplifier input (REVERSE head connected)

3437PBFIN2

PBFIN1

I —

Playback equalizer amplifier input (FORWARD head connected)

4.0V –70dBm

Pin No.

Symbol

Typical pin voltage

I/O

I/O resistance

Equivalent circuit Description

DC AC

– 7 –

CXA2511AQ

3338PBREF2

PBREF1

O —

Playback equalizer amplifier reference (Vcc/2 output)

4.0V —

38

33

GND

200

Vcc

200

35 VCT O —

Center (Vcc/2 output)

4.0V —

35

GND

45k

Vcc

147

× 1

30k

VGS

36

PBGND

—

Playback equalizer amplifier ground (Connect to ground.)

0.0V

—

Pin No.

Symbol

Typical pin voltage

I/O

I/O resistance

Equivalent circuit Description

DC AC