Sony CXA1580Q Datasheet

CXA1580Q

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Dolby B T ype Noise Reduction System with Playback Equalizer

Description

The CXA1580Q is an IC designed for use in car
stereos. Functions include Dolby B type noise
reduction, playback equalizer and interval detection
between tracks (MUSIC SENSOR) into a single
chip.

Features

• Few external parts

• Forward/Reverse head switching

• 3-input selector switch (TAPE, CD, RADIO)

• Small package (40-pin QFP)

• Dolby B type noise reduction and playback

equalizer into a single chip

• Same pin configuration as Dolby B/C type noise

reduction system (CXA1581)

• Interval detection level between tracks can be set

by external resistors/capacitors (2 modes).

Applications

• Car stereos

• Stereo cassette deck players (playback only)

40 pin QFP (Plastic)

Absolute Maximum Ratings (Ta=25°C)

• Supply voltage Vcc 12 V

• Operating temperature Topr –40 to +85 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation
PD 430 mW

Recommended Operating Condition

Supply voltage Vcc 6.5 to 11 V

Structure

Bipolar silicon monolithic IC

* “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—

E93503-TE

Block Diagram and Pin Configuration

CXD1580Q

PBTC1

PBFB1

PBRIN1

PBFIN1

PBGND

E IREF

PBFIN2

PBRIN2

PBFB2

PBTC2

RADIOIN1

TAPEIN1

GND

PBOUT1

CDIN1

VCT

NC1

LINEOUT1

2324252627282930

INSW

TC1

21

22

RADIO/CD

31

AUXSW

20

TAPE/AUX

32

33

34

300k

300k

IN

AUX

TAPE

35

36

37

38

39

300k

300k

DR

NR

10dB

MS

LPF

TAPE/AUX

40

MODE

G1/G2

DET

TAPESW

19

DRSW

18

NRSW

17

MSSW

16

MODESW

15

G1 (FF)

14

G2 (NOR)

13

MSTC

12

MSOUT

11

RADIO/CD

1 2 3 4 5 6 7 8 9

CC

V

CDIN2

PBOUT2

TAPEIN2

RADIOIN2

D IREF

NC2

LINEOUT2

10

TC2

MSGND

—2—

CXD1580Q

Pin Description (Ta=25°C, Vcc=8.0V, no signal)

Pin

Symbol

No. value resistance

DC I/O

1 PBOUT 2.8V —
30
32 PBFB 1.4V 150kΩ
39
33 PBIN 0V 70kΩ
34
37
38

2 Vcc 8.0V —

10 GND 0.0V —
29 MSGND
35 PBGND
31 PBTC — —
40

Equivalent circuit Description

Refer to Page 6.

PBEQ output

PBEQ feedback

PBEQ input

Power supply

Ground

PBEQ capacitance

Vcc

36 E IREF 1.25V —

11 MSOUT —

0.0V for
signal
detection;

5.0V for
no signal
detection

31
40

147

36

VDD=5V

11

42µ

147

147

30µ

10k

10µ

Vcc

1.25V

GND

Vcc

GND

Connection of reference current
setting resistor for PBEQ block.

MS output

—3—

GND

CXD1580Q

Pin

Symbol

No. value resistance

12 MSTC —

DC I/O

Approx.

1.4V for
signal
detection;

5.0V for
no signal
detection

13 G2(NOR) 4.0V —
14 G1(FF)

3 TAPEIN 4.0V 40kΩ

28

4 RADIOIN

27

VDD

28

27

13
14

3

4

Equivalent circuit Description

Connection of MS detection time

Vcc

constant

50µ

Vcc

100µ

GND

GND

MS feedback

12

147

147

1k

10µ

100k

TAPE input

Vcc

15µ

147

40k

to VGS

RADIO input

5 CDIN

26

6 D IREF 1.25V —

7 LINEOUT 4.0V —

24

26

5

24

CD input

GND

Vcc

Connection of reference current
setting resistor for Dolby block

6

147

147

7

8k

200

200

50µ

1.25V

GND

Vcc

GND

Line output

—4—

CXD1580Q

Pin

Symbol

No. value resistance

DC I/O

9 TC 0.3V —

22

15 MODESW — —
17 NRSW
18 DRSW
19 TAPESW
20 AUXSW
21 INSW

22

Equivalent circuit Description

Vcc

X2

20k

9

147

600k

0.5µ

6µ

0.5µ

GND

Connection of Dolby detection
capacitor

Refer to Page 6.

Vcc

15
17

147

18
19
20
21

50µ

GND

16 MSSW — —

25 VCT 4.0V —

8NC — —

23

16

25

147

147

30k

45k

30k

to VGS

50µ

Refer to Page 6.

Vcc

50µ

GND

Vcc/2 output

Vcc

50µ

GND

No connection.

—5—

* PBOUT, PBFB, PBIN equivalent circuit

CXD1580Q

Vcc

VREG

1k

OUT

FB

IN

147

147

147

70k

* Description for SW pins

MODESW - Switching of MS signal detection/blank detection

High: G1 (signal detection); Low: G2 (blank detection)

NRSW - Switching of Dolby B type noise reduction ON/OFF

High: noise reduction OFF; Low: Dolby B

DRSW - Switching of tape rotation

High: reverse; Low: forward

TAPESW - Switching of HIGH/NORMAL tape

High: NORMAL tape; Low: HIGH tape

AUXSW - Switching of CD/RADIO in the AUX mode

High: CD; Low: RADIO

INSW - Switching of TAPE/AUX

High: TAPE; Low: AUX

MSSW - Switching of MS ON/OFF

High: MS ON; Low: MS OFF

300k

1k

300k

GND

—6—