Sony CXA2560Q Datasheet
Dolby∗B Type Noise Reduction System with Playback Equalizer Amplifier
Description
The CXA2560Q is an IC designed for use in car
stereo cassette decks. Functions include Dolby B type
noise reduction (NR) system, playback equalizer
amplifier and music sensor into a single chip.
Features
• Few external parts
• Small package (40-pin QFP)
• Same pin configuration as for the Dolby B-C type
NR system (CXA2561Q) and no Dolby NR system
(CXA2559Q)
• Dolby B type NR and playback equalizer amplifier
into a single chip
• FORWARD/REVERSE head select switch
• Mute function
• Music signal interval detection level can be set by
the external resistors/capacitors (2 modes).
• High-frequency cut-off of the music sensor circuit
can be adjusted by the external capacitance.
CXA2560Q
40 pin QFP (Plastic)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltage VCC 12 V
• Operating temperature Topr –40 to +85 °C
• Storage temperature Tstg –65 to +150 °C
• Power dissipation PD 430 mW
Operating Condition
Supply voltage VCC 6.5 to 11 V
Applications
• Car stereo cassette decks
• Playback-only cassette decks
∗
This IC is 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 trademarks 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 –
E97438A79-PS
Block Diagram and Pin Configuration
CXA2560Q
PBFB2
PBRIN2
PBGND
PBFIN2
VCT
PBREF
PBFIN1
PBGND
PBRIN1
PBFB1
31
32
33
34
35
36
37
38
39
40
45k
PBTC2
30
1
29
7k/12k
300k
F2
30k
30k
F1
300k
7k/12k
PBOUT2
2
OUTREF2
28
70µ/120µ 70µ/120µ
3
TAPEIN2
27
100k
× 1
× 1
100k
4
T2
26
T1
5
GND
LPF
DIREF
25
24
BIAS
MUTE
TAPE EQ
FWD/RVS
VCC
F3
6
LINEOUT2
23
OFF/B
OFF/B
8
7
TCH2
NR
NR
NC
21
22
MS MODE
NR MODE
MS ON/
OFF
DET
9
10
MSSW
20
19
18
17
16
15
14
13
12
11
MSMODE
DRSW
TAPESW
MUTESW
NRSW
NC
MSOUT
MSTC
G1FB
G2FB
PBTC1
PBOUT1
TAPEIN1
OUTREF1
Vcc
NC
TCH1
LINEOUT1
NC
MSLPF
– 2 –
CXA2560Q
Pin Description (Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Pin
No.
1
30
Symbol
PBTC1
PBTC2
229PBOUT1
PBOUT2
Typical pin voltage
DC AC
4.0V —
4.0V –25dBm
I/O
I/O
resistance
——
O
—
30
Equivalent circuit Description
Vcc
147
1
GND
40
29
31
300k
2
147
2p
200
200
Vcc
Playback equalizer
amplifier
capacitance.
Playback equalizer
amplifier output.
3
28
4
27
OUTREF1
OUTREF2
TAPEIN1
TAPEIN2
4.0V —
4.0V
–30dBm
GND
Vcc
O
I 100kΩ TAPE input.
—
3
28
4
27
200
200
147
100k
GND
Vcc
30p
Output reference.
(Vcc/2 output)
VGS
GND
Vcc 8.0V5 — — — Power supply.
– 3 –
CXA2560Q
(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Pin
No.
Symbol
724LINEOUT1
LINEOUT2
823TCH1
TCH2
Typical pin voltage
DC AC
4.0V –6dBm
0.3V —
I/O
I/O
resist-
Equivalent circuit Description
ance
Vcc
200
O — Line output.
24
——
8
23
147
7
147
200
36k
22.5k
GND
Vcc
Time constant for
the HLS.
330k
10
11
12
MSLPF
G2FB
G1FB
4.0V
4.0V
—
—
— 100k
—
—
12
11
10
147
100k
147
64p
Vcc
GND
500
500
GND
Cut-off frequency
adjustment of the
music sensor LPF.
Vcc
Music signal
interval detection
level setting.
– 4 –
GND
CXA2560Q
(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Pin
No.
13
Symbol
MSTC
14 MSOUT
Typical pin voltage
DC AC
—
—
0.2V
when a
signal is
detected
; DVcc
—
when no
signal is
detected
I/O
resist-
I/O
ance
—
—
O—
Equivalent circuit Description
Vcc
Time constant for
147
13
853
10k
GND
Vcc
detecting the
music signal
interval.
Music sensor
14
GND
output.
17
MUTESW
18
TAPESW
21
MSSW
NRSW
16
19 DRSW
0.0V
when
open
0.0V
when
open
—
—
I 100kΩ
I
100kΩ
16
19
17
18
21
147
100k
147
100k
Vcc
GND
Vcc
GND
Mute function
control.
Low (open) :
Mute OFF
High: Mute ON
Playback
equalizer amplifier
control.
Low (open) : 70µs
High: 120µs
Music sensor
control.
Low (open) :
MS ON
High : MS OFF
Dolby NR control.
Low (open) :
NR OFF
High: NR ON
Head select
control.
Low (open) :
FORWARD
High: REVERSE
– 5 –
CXA2560Q
(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
I/O
resistance
0.0V
20 MSMODE I
when
—
100kΩ
open
25 DIREF — —
1.2V —
20
Equivalent circuit Description
Vcc
Music sensor
147
mode control.
Low (open): G1
100k
GND
Vcc
High: G2
Resistance for
setting the
reference current.
147
25
(Connects 18kΩ
between DIREF
pin and GND for
the standard
setting.)
26
GND
31
PBFB2
40
PBFB1
3239PBRIN2
PBRIN1
PBFIN2
34
PBFIN1
37
33
PBGND
38
0.0V
4.0V
4.0V
0.0V
—
–70dBm
–70dBm
—
—
—
I—
I
—
——
32
150 150
39
34
37
Vcc
50p50p
GND
GND
Ground.
Playback
equalizer amplifier
feedback.
Playback
equalizer amplifier
input.
31
(REVERSE head
40
connected)
Playback
equalizer amplifier
input.
(FORWARD head
connected)
Playback
equalizer amplifier
ground.
(Connect to
ground.)
– 6 –
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