CXA1911

Manufacturer Part NumberCXA1911
DescriptionDolby B/C Type Noise Reduction System with Playback Equalizer
ManufacturerSONY [Sony Corporation]
CXA1911 datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
Page 1/18

Download datasheet (336Kb)Embed
Next
Dolby B/C Type Noise Reduction System with Playback Equalizer
For the availability of this product, please contact the sales office.
Description
The CXA1911Q is an IC designed for use in car
stereo cassette decks. Functions include Dolby B/C
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/C type noise reduction and playback
equalizer into a single chip
• Same pin configuration as Dolby B type noise
reduction system (CXA1910Q)
• Music sense level can be set by external
resistors/capacitors (2 modes).
• High-band cut filter frequency can be adjusted by
the external capacitance.
Applications
• Car stereo cassette decks
• Cassette decks (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.
CXA1911Q
40 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage
• Operating temperature Topr
• Storage temperature
• Allowable power dissipation
Recommended Operating Conditions
• Supply voltage
—1—
V
12
V
CC
–40 to +85
°C
Tstg
–65 to +150
°C
P
430
mW
D
V
7.8 to 11
V
CC
E93Y13-TE

CXA1911 Summary of contents

  • Page 1

    ... Dolby B/C Type Noise Reduction System with Playback Equalizer For the availability of this product, please contact the sales office. Description The CXA1911Q designed for use in car stereo cassette decks. Functions include Dolby B/C type noise reduction, playback equalizer amplifier and music sensor into a single chip. ...

  • Page 2

    ... PBTC1 PBFB1 PBRIN1 F/R PBFIN1 PBGND E IREF F/R PBFIN2 PBRIN2 PBFB2 PBTC2 300k 10dB LPF 300k —2— TAPESW DRSW IN NRMODE MSSW MSMODE A MS MODE G1 (FF) G2 (NOR) G1/G2 MSTC DET MSOUT CXA1911Q ...

  • Page 3

    ... MSLPF 4.0 100kΩ Equivalent circuit Refer to Page 7. 3 147 28 12µA VGS V 100k 5 147 64p GND —3— CXA1911Q (Ta=25°C, V =8.0V, no signal) CC Description PBEQ output PBEQ feedback PBEQ input Power supply TAPE input No connection Adjustment of MS LPF frequency CC ...

  • Page 4

    ... GND 35 PBGND Equivalent circuit 6 147 V CC 200 147 7 200 24 GND 8 147 23 9 147 22 —4— CXA1911Q Description Connection of reference current setting resistor for Dolby block Line output Time Constant pin for the LLS Time Constant pin for the HLS Ground ...

  • Page 5

    ... GND 15 50µ 50µ 147 21 V 50µ 50µ 147 16 GND —5— CXA1911Q Description MS output Connection of MS detection time Vcc constant 50µ GND MS feedback CC MSMODE MS gain selector G1 when high, G2 when low DRSW Head selector Reverse when high, Forwards when low TAPESW Equalizer selector 120µ ...

  • Page 6

    ... Q3 to VGS 147 25 45k 147 31 40 42µ 30µ V 147 1.25V 36 10µ GND —6— CXA1911Q Description Noise reduction selector C when high, B when low V /2 output CC PBEQ capacitance V CC GND Connection of reference current CC setting resistor for PBEQ block ...

  • Page 7

    ... LINE OUT –25dB TAPE IN CP3 2kHz, LINE OUT –60dB TAPE IN CP4 2kHz, LINE OUT –25dB TAPE IN CP5 5kHz, LINE OUT –25dB TAPE IN CP6 10kHz, LINE OUT 0dB NR C, TAPEIN —7— CXA1911Q Vcc V REG 600 GND Min. Typ. Max. Unit 7.8 8.0 11 ...

  • Page 8

    ... NRSW, TAPESW, DRSW, NRMODE, MSSW, MSMODE signal, 3.4 V applied to VCT and 1 CRG to PBFB No signal, VCT level when boost charge V CRG1 ON No signal, VCT level when boost charge V CRG2 OFF —8— CXA1911Q Min. Typ. Max. Unit — 0.01 0.2 — 0.04 0.2 % — 0.07 0.3 77.0 84.0 — ...

  • Page 9

    ... CXA1911Q ...

  • Page 10

    ... Operating modes (TAPESW, DRSW, NRSW, MSSW, MODESW, NRMODE) The CXA1911Q has an NR switch (NRSW), NR mode switch (NRMODE), equalizer switch (TAPESW), head switch (DRSW), MS switch (MSSW), and MS gain switch (MSMODE). The operating modes for each switch are shown in the following table. SW NRSW ...

  • Page 11

    ... With this method, the capacitance value can be reduced according to the amount that the resistance value is increased even for the same cut-off frequency. (These specifications use the latter method.) Dolby level (–6dBm) LINEOUT PBOUT TAPEIN Op2 OFF Fig. 1 —11— CXA1911Q 4dB NR 20dB 20dB ...

  • Page 12

    ... Note) This diagram illustrates the case where the Dolby level is aligned by adjusting the resistance value connected to PBFB –30dBm –30dBm Fig.2 —12— CXA1911Q –6dBm Dolby level ...

  • Page 13

    ... In this diagram, C1 and R1 are not connected in series, but are connected to PBFB from between R1 and C2. This is to prevent the sound quality from deteriorating when using an electrolytic capacitor PBTC PBOUT IREF External resistor R1 and capacitor C1 —13— IREF resistor CXA1911Q ...

  • Page 14

    ... G1 and G2 have the same cut-off frequency 25kHz LPF 100k 64pF 100k G1 G2 MSLPF External resistors R1 and R2 [dB 20log External resistors R1 and R2 and external capacitors C1 and External capacitor C3 —14— MSTC MSOUT DET 100k [dB] R2 CXA1911Q ...

  • Page 15

    ... Level –4 50 100 —15— Playb ack equalizer frequency resp onse =8.0V 1k Frequency [Hz] 300k 0.01µ 33µ 270 C typ e decode characteristics –50dB 500 1k 5k Frequency [Hz] CXA1911Q Ta=25°C 120µs 70µs 10k OUT Ta=25°C –60dB –40dB –30dB –20dB –10dB 0dB 10k ...

  • Page 16

    ... OFF f=1kHz f=1kHz –8 0 –4 Rip p le rejection ratio (PB O UT) Ta=25°C –10 Vcc=8.0V RL=2.7k –20 –30 –40 –50 –60 50 100 12 —16— CXA1911Q Ta=25° f=100kHz NR B f=10kHz 14 – Output level [dB] 500 1k 5k 10k Frequency [Hz] Ta=25°C ...

  • Page 17

    ... MS b lock gain vs. B lank detection level Ta = 25° 8 Input : TAPEIN 1 MSLPF Pin: T120 pF –30 –40 –50 –60 10k –70 —17— CXA1911Q 2ch) Ta=25 °C 500 1k 5k 10k Frequency [Hz] Ta=25°C V =8.0V CC Input : TAPEIN1 f=1kHz ...

  • Page 18

    ... SONY CODE EIAJ CODE JEDEC CODE 40PIN QFP (PLASTIC) 9.0 ± 0.4 + 0.4 7.0 – 0 0.15 0.3 – 0.1 M ± 0.12 + 0.15 PACKAGE STRUCTURE DETAIL A PACKAGE MATERIAL QFP-40P-L01 LEAD TREATMENT LEAD MATERIAL QFP040-P-0707 PACKAGE WEIGHT —18— CXA1911Q + 0.35 1.5 – 0.15 + 0.1 0.127 – 0.05 0.1 A EPOXY RESIN SOLDER / PALLADIUM PLATING COPPER / 42 ALLOY 0.2g ...