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PDF CXA1911 Data sheet ( Hoja de datos )
| Número de pieza | CXA1911 | |
| Descripción | Dolby B/C Type Noise Reduction System with Playback Equalizer | |
| Fabricantes | Sony Corporation | |
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CXA1911Q
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
40 pin QFP (Plastic)
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)
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 Conditions
• Supply voltage
VCC 7.8 to 11
V
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.
—1—
E93Y13-TE
1 page  
CXA1911Q
Pin DC
Symbol
No. value
11 MSOUT 0.2 V
for signal
detection;
5.0 V for
no signal
detection
Z (in)
—
12 MSTC Approx.
1.4 V for
signal
detection;
5.0 V for
no signal
detection
—
13 G2(NOR) 4.0V
14 G1(FF)
—
Equivalent circuit
VDD=5V
VCC
Description
MS output
147
11
20k
VDD=5V
147
12
1k
GND
Connection of MS detection time
Vcc constant
50µ
13
147
14
GND
MS feedback
VCC
10µ
100k
100µ
15 MSMODE —
18 DRSW
—
19 TAPESW
21 NRSW
16 MSSW —
—
15
18
19
147
21
147
16
GND
50µ 50µ
VCC
50µ 50µ
MSMODE MS gain selector
G1 when high, G2 when low
DRSW Head selector
Reverse when high, Forwards
when low
TAPESW Equalizer selector
120µs when high, 70µs when
low
NRSW NR ON/OFF selector
MS on/off selector
MS on when high, MS off when
low
—5—
GND
5 Page 
Description of Operation
1. Signal route
PBFB PBTC
PBOUT TAPEIN
Dolby level
(–6dBm)
LINEOUT
CXA1911Q
Op1 Op2 4dB NR
NR ON NR OFF
20dB
20dB
PBIN
FR
Fig. 1
Op1 and Op2 are operational amplifiers.
Op1 composes the playback equalizer by attaching a resistor and a capacitor to PBFB pin, and a
capacitor to PBTC pin.
Op2 is an input selector and a LINEOUT amplifier. The gain is 24 dB.
The Dolby reference level is –6 dBm (LINEOUT).
The adjustment method of playback equalizer is described in the paragraph (3).
Note)
Usually the TAPEIN pin level is adjusted by attenuator connected to PBOUT pin.
The capacitance value connected to PBFB can be reduced by adjusting the resistance
connected to PBFB to match the PBOUT level.
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.)
—11—
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet CXA1911.PDF ] | |
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| CXA1911 | Dolby B/C Type Noise Reduction System with Playback Equalizer | Sony Corporation |
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