Sony CXA2509AQ Datasheet
CXA2509AQ
Playback Equalizer Amplifier with Music Sensor
Description
The CXA2509AQ is an IC designed for use in car
stereo cassette decks. Functions include 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 (CXA2511AQ) and Dolby B type NR
system (CXA2510AQ)
• Playback equalizer amplifier and music sensor into
a single chip
• FORWARD/REVERSE head select switch
• Two-system (TAPE/AUX) input select switch
• 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.
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 7.8 to 11 V
40 pin QFP (Plastic)
Applications
• Car stereo cassette decks
• Playback-only cassette decks
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 –
E96826-PS
Block Diagram and Pin Configuration
CXA2509AQ
PBFB2
PBRIN2
PBREF2
PBFIN2
VCT
PBGND
PBFIN1
PBREF1
PBRIN1
PBFB1
31
32
33
34
35
36
37
38
39
40
PBEQ2
30
VCT
PBOUT2
29
F2
F1
GND
28
120µ/70µ
120µ/70µ
TAPEIN2
27
× 1
× 1
26
T2
T1
AUXIN2
25
TAPE/AUX
LPF
DIREF
24
NR BIAS
TAPE EQ
FWD/RVS
VCC
F3
LINEOUT2
NC
23
24dB
24dB
NC
21
22
MS MODE
MS ON/
OFF
DET
MSSW
20
19
18
17
16
15
14
13
12
11
MSMODE
DRSW
TAPESW
INSW
NC
NC
MSOUT
DGND
MSTC
G1FB
1
PBEQ1
2
PBOUT1
4
3
CC
V
AUXIN1
TAPEIN1
7
MSLPF
LINEOUT1
6
5
9
8
NC
10
NC
G2FB
– 2 –
CXA2509AQ
Pin Description (Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Pin
No.
1
30
2
29
Symbol
PBEQ1
PBEQ2
PBOUT1
PBOUT2
Typical pin voltage
DC AC
4.0V —
4.0V –25dBm
I/O
I/O
resistance
O—
O—
30
Equivalent circuit Description
Vcc
40k
Resistance for
1k
1
1k
5k
selecting the
playback equalizer
amplifier time
constant
GND
Vcc
Playback
equalizer amplifier
output
29
200
2
200
GND
3
VCC — — Power supply
4
TAPEIN1
27
TAPEIN2
5
AUXIN1
26
AUXIN2
MSLPF — 100kΩ
6
8.0V —
4.0V –30dBm
4.0V
—
I 40kΩ
27
26
Vcc
TAPE input
4
147
5
40k
20p
External input
VGS
100k
6
147
64p
GND
Vcc
Cut-off frequency
adjustment of the
music sensor LPF
– 3 –
GND
CXA2509AQ
Pin
No.
Symbol
724LINEOUT1
LINEOUT2
1011G2FB
G1FB
Typical pin voltage
DC AC
4.0V –6dBm
4.0V —
I/O
I/O
resistance
O — Line output
——
10
11
Equivalent circuit Description
Vcc
200
147
7
24
147
200
22.5k
GND
500
500
Vcc
Music signal
interval detection
level setting
12 MSTC — —
13 DGND — —
——
0.0V —
0.2V
when a
signal is
14 MSOUT O —
detected;
DVcc
—
when no
signal is
detected
12
DVcc
14
147
100k
DGND
853
DGND
10k
GND
Vcc
Time constant for
detecting the
music signal
interval
GND
Logic ground
(Connect to GND.)
Vcc
Music sensor
output
GND
– 4 –
CXA2509AQ
Pin
No.
17
Symbol
INSW
Typical pin voltage
DC AC
I/O
I/O
resistance
0.0V
18 TAPESW
when
—
I 100kΩ
open
19 DRSW
0.0V
20 MSMODE I 100kΩ
when
—
open
20
Equivalent circuit Description
Vcc
17
1.1k
18
19
100k
DGND
GND
Vcc
1.1k
100k
Line amplifier input
select control
Low (open): TAPEIN
High: AUXIN
Playback equalizer
amplifier control
Low (open): 120µs
High: 70µs
Head select control
Low (open):
FORWARD
High: REVERSE
Music sensor
mode control
Low (open): G1
High : G2
21
MSSW
0.0V
when
open
—
I
100kΩ
21
1.1k
100k
DGND
GND
Vcc
Music sensor
control
Low (open): MS ON
High: MS OFF
DGND
GND
– 5 –
CXA2509AQ
Pin
No.
Symbol
Typical pin voltage
DC AC
I/O
I/O
resistance
Equivalent circuit Description
Vcc
Resistance for
setting the
reference current
(Connects
25 DIREF — —
1.2V —
25
147
20 (18) kΩ
between DIREF
pin and GND for
the standard
setting.)
GND
28 GND — — Ground
31
PBFB2
40
PBFB1
3239PBRIN2
PBRIN1
3437PBFIN2
PBFIN1
0.0V —
4.0V –70dBm
4.0V –70dBm
I—
I—
32
39
34
36
PBREF PBREF
Vcc
50p50p
GND
Playback
equalizer amplifier
feedback
Playback
equalizer amplifier
31
input (REVERSE
40
head connected)
Playback
equalizer amplifier
input (FORWARD
head connected)
3338PBREF2
PBREF1
4.0V —
O—
– 6 –
33
38
200
200
Vcc
Playback
equalizer amplifier
reference (VCC/2
output)
GND
CXA2509AQ
Pin
No.
Symbol
35 VCT O —
36
PBGND — —
Typical pin voltage
DC AC
4.0V —
0.0V —
I/O
I/O
resistance
8
9
15
16
NC
—
—
—
22
23
Equivalent circuit Description
Vcc
30k
147
Center (VCC/2
output)
35
VGS
× 1
45k
30k
GND
Playback
equalizer amplifier
ground (Connect
to ground.)
— No connected
– 7 –
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