Sony CXA1910Q Datasheet

CXA1910Q

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Dolby B Type Noise Reduction System with Playback Equalizer

Description

The CXA1910Q is an IC designed for use in car stereos. Functions include Dolby B type noise reduction, playback equalizer amplifier and Music sensor into a single chip.

Features

• Few external parts

• Forward/Reverse head switching

• 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 (CXA1911)

• Music sense level can be set by external

resistors/capacitors (2 modes).

• High-band cut filter frequency can be adjusted by

the external capacitance.

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

Recommended Operating Condition

Supply voltage VCC 6.5 to 11 V

40 pin QFP (Plastic)

PD 430 mW

Applications

• Car stereos

• Stereo cassette deck players (playback only)

Structure

Bipolar silicon monolithic IC

∗ These ICs are 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 trade marks 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.

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E93Z04-TE

Block Diagram and Pin Configuration

CXA1910Q

PBTC1

PBFB1

PBRIN1

PBFIN1

PBGND

E IREF

PBFIN2

PBRIN2

PBFB2

PBTC2

NC

PBOUT1

GND

NC

TAPEIN1

VCT

NC1

LINEOUT1

NRSW

TC1

22 212324252627282930

NC

31

32

33

34

35

36

37

38

39

40

300k

F/R

300k

NR OFF

NR ON

AUX

TAPE

DR

NR

10dB

NR ON

NR

IN

MS MODE

LPF

G1/G2

DET

20

TAPESW

19

DRSW

18

NRMODE

17

MSSW

16

MSMODE

15

G1 (FF)

14

G2 (NOR)

13

MSTC

12

MSOUT

11

1 2 3 4 5 6 7 8 9 10

Vcc

PBOUT2

NC

D IREF

TAPEIN2

MS LPF

LINEOUT2

NC2

TC2

MSGND

—2—

CXA1910Q

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

Symbol

No. value

DC

Z (in) Equivalent circuit Description

1 PBOUT 2.1V — 30 32 PBFB 2.1V 300kΩ 39 33 PBIN 0V — 34 37 38

2VCC 8.0V —

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

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

36

VDD=5V

11

147

42µ

147

30µ

20k

10µ

Vcc

1.25V

GND

Vcc

GND

Reference current setting resistor pin

MS output

—3—

GND

CXA1910Q

Symbol

No. value

DC

Z (in) Equivalent circuit Description

12 MSTC Approx. —

1.4V for signal detection;

5.0V for no signal detection

13 G2(NOR) 4.0V — 14 G1(FF)

3 TAPEIN 4.0V 40k 28

VDD=5V

13 14

12

147

1k

10µ

100k

15µ

50µ

Vcc

100µ

GND

Vcc

Connection of MS detection

Vcc

time constant

GND

MS feedback

TAPE input

6 D IREF 1.25V —

7 LINEOUT 4.0V — 24

28

3

147

40k

to VGS

GND

Vcc

Connection of reference current setting resistor for Dolby block

8k

200

50µ

1.25V

GND

Vcc

Line output

6

24

147

7

—4—

GND

CXA1910Q

Symbol

No. value

DC

Z (in) Equivalent circuit Description

9 TC 0.3V — 22

15 MSMODE — — 17 NRMODE 18 DRSW 19 TAPESW 21 NRSW

22

Vcc

Time Constant pin for the level

×2

6µ

0.5µ

20k

9

147

600k

GND

Vcc

15 17 18 19 21

147

50µ

GND

detector

0.5µ

Refer to Page 6.

16 MSSW — —

25 VCT 4.0V —

4NC — —

8 20 23 26 27

5 MSLPF 4.0V 100k

25

16

147

100 k

147

30k

45k

30k

to VGS

50µ

GND

50µ

GND

VCC

Vcc

Refer to Page 6.

VCC/2 output

No connection.

Capacitance connection for adjusting the MS LPF time constant.

5

147

64p

GND

—5—

*

PBOUT, PBFB, PBIN equivalent circuit

CXA1910Q

Vcc

VREG

PBOUT

147

1

30

PBFB

32 39

PBIN

33 34 37 38

∗

Description for SW pins

10p300k

MSMODE - Switching of MS signal detection/blank detection

High: G1; Low: G2

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

High: noise reduction ON; Low: noise reduction OFF

DRSW - Switching of tape direction

High: reverse; Low: forward

TAPESW - Switching of HIGH/NORMAL tape

High: NORMAL tape; Low: HIGH tape

NRMODE - Switching of noise reduction modes

High: noise reduction OFF; Low: Dolby B

MSSW - Switching of MS ON/OFF

High: MS ON; Low: MS OFF

500

600

GND

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