CXA1980Q Sony, CXA1980Q Datasheet

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CXA1980Q

Manufacturer Part Number
CXA1980Q
Description
Manufacturer
Sony
Datasheet
Dolby B Type Noise Reduction System with Playback Equalizer
Description
The CXA1980Q is an IC designed for use in car
stereos. Functions include Dolby B type noise
reduction (NR), playback equalizer and interval
detection between tracks (Music Sensor) into a
single chip.
Features
• Few external parts
• Forward/Reverse head switching
• Small package (32-pin QFP)
• Dolby B type noise reduction and playback
equalizer into a single chip
• Interval detection level between tracks can be set
by external resistors/capacitors (2 modes).
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.
CXA1980Q
32 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage
V
CC
• Operating temperature
Topr
• Storage temperature
Tstg
• Allowable power dissipation
P
D
Recommended Operating Condition
Supply voltage
V
CC
—1—
12
V
–40 to +85
°C
–65 to +150
°C
430
mW
6.5 to 11
V
E94913B27

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CXA1980Q Summary of contents

Page 1

... Dolby B Type Noise Reduction System with Playback Equalizer Description The CXA1980Q designed for use in car stereos. Functions include Dolby B type noise reduction (NR), playback equalizer and interval detection between tracks (Music Sensor) into a single chip. Features • Few external parts • Forward/Reverse head switching • ...

Page 2

... Block Diagram and Pin Configuration 24 23 PBFB1 PBRIN1 300k PBFIN1 PBGND TAPE E IREF DA PBFIN2 300k PBRIN2 PBFB2 10dB LPF —2— CXA1980Q 17 DRSW NRSW MS MSSW MODE MODESW G1 (FF) G2 (NOR) DET MSTC MSOUT 8 ...

Page 3

... CC 15µ 147 4 10P 40k to VGS 21 GND 147 1.25V 5 50µA GND —3— CXA1980Q (Ta=25°C, V =8.0V, no signal) CC Description PBEQ capacitance CC PBEQ output PBEQ feed back PBEQ input Power supply Tape input Connection of reference current setting resistor for Dolby block ...

Page 4

... GND V = 147 9 10k GND 50µ 147 10 1k GND V CC 10µ 100k 11 147 12 100µ GND —4— CXA1980Q Description Line output Connection of time constant of level detector MS output Connection of MS detection time constant MS feed back ...

Page 5

... GND 50µ 50µ 147 14 GND V CC 30k 50µ 45k 20 147 to VGS 30k GND V CC 147 1.25V 29 10µ GND —5— CXA1980Q Description Refer to page 6 Refer to page output CC Ground Connection of reference current setting resistor for PBEQ block. ...

Page 6

... Switching of tape rotation High: reverse; Low: forward TAPESW — Switching of HIGH/NORMAL tape High: NORMAL tape; Low: HIGH tape MSSW — Switching of MS ON/OFF High: MS ON; Low: MS OFF 147 300k 147 25P 147 300k 70k —6— CXA1980Q REG 1k 1k GND ...

Page 7

... No signal "A" weighting filter No signal Rg=2. 1kHz –42dBm TAPE IN 5kHz MS-ON G1 (10k , 0.015µF) TAPE IN 5kHz (1k , 1.5µF) TAPE IN 5kHz –10dBm, 5V applied to MSOUT TAPE IN 5kHz –30dBm, 1mA applied to MSOUT AUXSW, MODESW, INSW, MSSW, TAPESW, NRSW, DRSW —7— CXA1980Q Min. Typ. Max. Unit 9.0 12.4 16.0 mA –32.0 – ...

Page 8

... Operation mode control (TAPESW, DRSW, NRSW, MSSW, MODESW) The CXA1980Q has built in electronic switch circuits and the operations are controlled by the direct current applied to each SW pin. The operation mode state for each switch is shown in the table below. SW Function for Low input TAPESW 70µ ...

Page 9

... 19.2k DC Ammeter DRSW R10 PBFB1 2.2k C6 PBRIN1 NRSW R9 4.7µ C5 2.2k PBFIN1 MSSW 4.7µ PBGND MODESW CXA1980Q R15 G1(FF) E IREF 15k C3 G2(NOR) PBFIN2 4.7µ C3 2.2k MSTC PBRIN2 4.7µ MSOUT PBFB2 2. R43 S16 10k DC R42 S17 Voltmeter ...

Page 10

... PBFB2 1 2 10n Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party and other right due to same. 0.22µ ...

Page 11

... VR adjustment –45 –50 –55 –60 –65 –70 –70dBm –75 Dolby level (–30dBm) (–6dBm) PBOUT TAPEIN LINEOUT Op2 TAPE AUX Fig –30dBm –30dBm Fig. 2 —11— CXA1980Q 4dB NR 20dB 20dB –6dBm Dolby level ...

Page 12

... R1 adjustment method with the same C1 value used for this method.] 3 Low-band cut-off frequency The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor C1. 3 PBTC PBOUT IREF 1 R4 External resistor R1 and external capacitor C1 —12— CXA1980Q Fig IREF resistor ...

Page 13

... The external resistors R1, R2 and external capacitors C1, C2 should be adjusted to adjust the low- band cut-off frequency of MS frequency characteristics. 2 NOR (BS (AMS) 2 MSTC 25kHz LPF 100k Fig. 5 External resistors R1, R2 R2+100k G2=10+20log (dB) R2 External resistors R1, R2 and external capacitors C1, C2 —13— CXA1980Q MSOUT DET ...

Page 14

... Playback equalizer frequency characteristics Ta=25°C V =8. OFF, MS OFF Output level 25dBm constant 100 0.01µ 11.0 12.0 Decode boost frequency characteristics –40dB V =8.0V CC 0dB=Dolby Level –30dB –20dB –10dB 1k 10k Frequency [Hz] —14— CXA1980Q Ta=25°C 120µs 70µs 1k 10k Frequency [Hz] OUT 300k 33µ 270 Ta=25°C 0dB ...

Page 15

... f=1kHz –8 –4 0 –6 Ta=25° =8.0V CC –10 –20 –30 –40 –50 –60 –70 10k 100 —15— CXA1980Q Ta=25° f=100Hz NR ON f=10kHz – Output level [dBm] Ripple elimination ratio (LINEOUT) Ta=25°C NR OFF 10k Frequency [Hz] ...

Page 16

... Cross talk between channels (1ch 2ch) 1k Frequency [Hz] Ta=25°C V =8.0V CC Ta=25°C Input : TAPEIN1 HPF gain 20dB HPF gain 40dB 10k MS block gain vs. Blank detection level V =8.0V CC Ta=25°C –30 Input : TAPEIN1 f=1kHz –40 –50 –60 – HPF gain [dB] —16— CXA1980Q Ta=25°C 10k Ta=25° ...

Page 17

... 0.30 – 0.10 ( 0.30) DETAIL A : SOLDER PACKAGE STRUCTURE EPOXY RESIN PACKAGE MATERIAL SOLDER PLATING QFP-32P-L01 LEAD TREATMENT P-QFP32-7x7-0.8 LEAD MATERIAL 42 / COPPER ALLOY 0.2g PACKAGE MASS ITEM SPEC. 42 ALLOY Sn-Bi Bi:1-4wt% 5-18 m —17— CXA1980Q 0 0.2 0.1 – 0.1 0 0.2 0.1 – 0.1 Sony Corporation ...

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