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PDF CXA1980Q Data sheet ( Hoja de datos )
| Número de pieza | CXA1980Q | |
| Descripción | Dolby B Type Noise Reduction System | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA1980Q
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.
32 pin QFP (Plastic)
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)
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
∗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—
E94913B27
1 page  
CXA1980Q
Pin
Symbol DC value
No.
13 MODESW
15 NRSW
16 DRSW
17 TAPESW
—
Z (in)
—
14 MSSW — —
Equivalent circuit
VCC
147
13
15
16
17
147
14
50µ
GND
VCC
50µ 50µ
Description
Refer to page 6
Refer to page 6
20 VCT
4.0V
—
22 GND
8 MSGND
28 PBGND
29 E IREF
0.0V
1.25V
—
—
30k
45k
20
147
to VGS
30k
GND
VCC
VCC/2 output
50µ
GND
Ground
147
29
Connection of reference
VCC current setting resistor for
PBEQ block.
1.25V
10µ
GND
—5—
5 Page 
Description of Operation
(1) Signal route
PBFB PBTC
Dolby level
(–30dBm)
PBOUT TAPEIN
(–6dBm)
LINEOUT
CXA1980Q
Op1 Op2 4dB NR
TAPE
AUX
20dB
20dB
PBIN
FR
Fig. 1
Op1 and Op2 are operational amplifiers.
Op1 compose 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 of LINEOUT amplifier is 24 dB.
Reference input level for Dolby is –30 dBm.
The adjustment method of playback equalizer is described in the paragraph (3).
(2) Level diagram
0dBm
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
PP
BB
IO
NU
T
T
A
P
E
I
N
VR adjustment
–30dBm
–30dBm
–70dBm
Fig. 2
—11—
L
I
N
E
O
U
T
–6dBm
Dolby level
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet CXA1980Q.PDF ] | |
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