CXA2510AQ
Dolby∗ B Type Noise Reduction System with Playback Equalizer Amplifier
Description
The CXA2510AQ 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 (CXA2511AQ) and no Dolby NR
system (CXA2509AQ)
• Dolby B type NR and playback equalizer amplifier
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.
40 pin QFP (Plastic)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltage
VCC
• Operating temperature Topr
• Storage temperature Tstg
• Power dissipation
PD
Operating Condition
Supply voltage
VCC
12
–40 to +85
–65 to +150
430
V
°C
°C
mW
7.8 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–
E96827-PS
CXA2510AQ
PBEQ2
PBOUT2
GND
TAPEIN2
AUXIN2
DIREF
LINEOUT2
TCH2
NC
MSSW
Block Diagram and Pin Configuration
30
29
28
27
26
25
24
23
22
21
NR
PBFB2 31
120µ/70µ
20 MSMODE
OFF/
B
PBRIN2 32
×1
19 DRSW
T2
MS MODE
NR BIAS
PBREF2 33
18 TAPESW
F2
TAPE/AUX
PBFIN2 34
17 INSW
TAPE EQ
NR MODE
VCT 35
VCT
16 NRSW
FWD/RVS
PBGND 36
15 NC
VCC
LPF
PBFIN1 37
DET
MS ON/
OFF
14 MSOUT
F1
PBREF1 38
×1
F3
13 DGND
T1
PBRIN1 39
12 MSTC
OFF/
B
PBFB1 40
120µ/70µ
11 G1FB
1
2
3
4
5
6
7
8
9
10
PBEQ1
PBOUT1
VCC
TAPEIN1
AUXIN1
MSLPF
LINEOUT1
TCH1
NC
G2FB
NR
–2–
CXA2510AQ
Pin Description
Pin
No.
Symbol
(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Typical pin voltage
DC
I/O
AC
I/O
resistance
Equivalent circuit
Description
Vcc
40k
1
30
PBEQ1
PBEQ2
1k
4.0V
—
O
—
Resistance for
selecting the
playback equalizer
amplifier time
constant
5k
1
1k
30
GND
Vcc
2
29
PBOUT1
PBOUT2
Playback
equalizer amplifier
output
200
4.0V
–25dBm O
—
2
29
200
GND
3
VCC
8.0V
—
—
—
Power supply
Vcc
4
27
TAPEIN1
TAPEIN2
TAPE input
4.0V
–30dBm
4
I
40kΩ
5
5
26
147
20p
27
AUXIN1
AUXIN2
40k
26
External input
VGS
GND
Vcc
100k
6
MSLPF
4.0V
—
—
100kΩ
Cut-off frequency
adjustment of the
music sensor LPF
6
147
64p
GND
–3–
CXA2510AQ
Pin
No.
Symbol
Typical pin voltage
DC
I/O
AC
I/O
resistance
Equivalent circuit
Description
Vcc
7
24
LINEOUT1
LINEOUT2
4.0V
–6dBm
O
200
147
—
Line output
7
22.5k
200
24
GND
Vcc
8
23
TCH1
TCH2
36k
0.3V
—
—
—
Time constant for
the HLS
147
8
23
330k
GND
Vcc
10
11
G2FB
G1FB
500
4.0V
—
—
—
Music signal
interval detection
level setting
147
10
500
11
GND
Vcc
12
MSTC
—
—
—
—
147
Time constant for
detecting the
music signal
interval
853
12
10k
DGND
GND
13
DGND
0.0V
—
—
Logic ground
(Connect to GND.)
—
–4–
CXA2510AQ
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
I/O
resistance
Equivalent circuit
Description
Vcc
14
MSOUT
0.2V
when a
signal is
detected;
DVcc
when no
signal is
detected
DVcc
Time constant for
detecting the
music signal
interval
100k
—
O
—
14
DGND
GND
Vcc
17
INSW
0.0V
when
open
21
1.1k
—
I
100kΩ
17
21
100k
DGND
MSSW
GND
16
18
Vcc
NRSW
TAPESW
0.0V
when
open
16
—
I
100kΩ
Line amplifier
input select
control
Low (open):
TAPEIN
High: AUXIN
Dolby NR control
Low (open):
NR OFF
High: NR ON
Playback equalizer
amplifier control
Low (open): 120µs
High: 70µs
1.1k
18
19
Music sensor
control
Low (open):
MS ON
High: MS OFF
100k
DGND
19
DRSW
GND
Head select control
Low (open):
FORWARD
High: REVERSE
Vcc
20
MSMODE
0.0V
when
open
—
I
100kΩ
Music sensor
mode control
Low (open): G1
High: G2
1.1k
20
100k
DGND
GND
–5–
CXA2510AQ
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
I/O
resistance
Equivalent circuit
Description
Vcc
25
DIREF
1.2V
—
—
Resistance for
setting the Dolby
NR reference
current
(Connects 18kΩ
between DIREF
pin and GND for
the standard
setting.)
147
—
25
GND
28
GND
0.0V
—
—
—
Ground
31
40
PBFB2
PBFB1
4.0V
–70dBm
I
—
Playback
equalizer amplifier
feedback
32
39
PBRIN2
PBRIN1
Vcc
32
4.0V
34
37
31
39
34
–70dBm
I
—
50p
50p
40
Playback
equalizer amplifier
input (REVERSE
head connected)
36
PBREF
PBREF
Playback
equalizer amplifier
input (FORWARD
head connected)
GND
PBFIN2
PBFIN1
Vcc
33
38
PBREF2
PBREF1
Playback
equalizer amplifier
reference (Vcc/2
output)
200
4.0V
—
O
—
33
38
200
GND
–6–
CXA2510AQ
Pin
No.
Symbol
Typical pin voltage
DC
I/O
AC
I/O
resistance
Equivalent circuit
Description
Vcc
30k
147
35
VCT
4.0V
—
O
—
VGS
×1
35
Center
(Vcc/2 output)
45k
30k
GND
36
PBGND
9
15
22
NC
0.0V
—
—
—
Playback
equalizer amplifier
ground (Connect
to ground.)
—
—
—
—
No connected
–7–
CXA2510AQ
Electrical Characteristics
Item
(Ta = 25°C, VCC = 8.0V. DVCC = 5.0V)
Symbol
Operating voltage
Vopr
Current consumption
ICC
Measurement conditions
No signal, NR OFF, TAPE, 120µs, MS ON
Min.
Typ.
Max.
Unit
7.8
8.0
11.0
V
7.6
11.6
15.6
mA
Dolby NR (0dB = Dolby level LINEOUT of –6dBm)
TAPEIN input sensitivity
VTIN
TAPEIN 1kHz, LINEOUT 0dB, NR OFF
–32.0 –30.0 –28.0 dBm
AUXIN input sensitivity
VAUX
AUXIN 1kHz, LINEOUT 0dB
–32.0 –30.0 –28.0 dBm
B type decode boost
characteristics 1
BP1
TAPEIN 500Hz, LINEOUT –25dB, NR ON
1.4
2.9
4.4
dB
B type decode boost
characteristics 2
BP2
TAPEIN 2kHz, LINEOUT –25dB, NR ON
5.5
7.0
8.5
dB
B type decode boost
characteristics 3
BP3
TAPEIN 5kHz, LINEOUT –25dB, NR ON
3.9
5.4
6.9
dB
B type decode boost
characteristics 4
BP4
TAPEIN 10kHz, LINEOUT –40dB, NR ON
9.7
10.4
11.9
dB
B type decode boost
characteristics 5
BP5
TAPEIN 10kHz, LINEOUT 0dB, NR ON
–1.1
0.4
1.9
dB
Total harmonic
distortion 1
THD1
TAPEIN 1kHz –20dBm, NR OFF,
RL = 2.7kΩ
—
0.01
0.2
%
Total harmonic
distortion 2
THD2
TAPEIN 1kHz –20dBm, NR ON,
RL = 2.7kΩ
—
0.04
0.2
%
Decode S/N ratio
SN1
No signal, NR ON, Rg = 5.1kΩ,
CCIR/ARM filter used
77.0
87.0
—
dB
Signal handling
SH1
TAPEIN 1kHz, NR OFF, RL = 2.7kΩ,
THD = 1%
13.0
14.4
—
dB
Crosstalk between
channels 1
CT1
TAPEIN 1kHz –24dBm, NR OFF,
1kHz BPF used
—
–86.0 –70.0
dB
Crosstalk between
channels 2
CT2
AUXIN 1kHz –24dBm, 1kHz BPF used
—
–86.0 –70.0
dB
Crosstalk between
TAPE and AUX
CT3
TAPE (AUX) IN 1kHz –24dBm,
NR OFF, AUX (TAPE) mode,
1kHz BPF used∗1
—
–67.0 –65.0
dB
Output DC offset voltage
VOS1
No signal, NR OFF, difference from VCT
–0.1
0.0
0.1
V
Playback Equalizer Amplifier
Playback equalizer amplifier
reference output level
PBREF
PBIN 315Hz –70dBm, 120µs mode
–27.0 –25.0 –23.0 dBm
Playback equalizer amplifier
frequency response 1
F120
PBIN 2.7kHz –58.5dBm,
120µs mode at 315Hz
–1.5
0.0
1.5
dB
Playback equalizer amplifier
frequency response 2
F70
PBIN 4.5kHz –53.8dBm,
70µs mode at 315Hz
–1.5
0.0
1.5
dB
Signal handling
SH2
PBIN 1kHz, 120µs mode, RL = 2.7kΩ,
THD = 1%
–10.0
–3.0
—
dBm
PBIN 1kHz –52dBm, 120µs mode,
RL = 2.7kΩ
—
0.07
0.5
%
No signal, 70µs mode, Rg = 680Ω,
CCIR/ARM filter used
59.0
64.5
—
dB
Total harmonic distortion THD3
S/N ratio
SN2
–8–
CXA2510AQ
Item
Symbol
Measurement conditions
Min.
Typ.
Max.
Unit
–1.0
0.0
1.0
V
Output DC offset
voltage
VOS2
No signal, 120µs mode, Rg = 680Ω,
difference from VCT
Crosstalk between
channels
CT4
PBIN 1kHz –42dBm, 120µs mode,
1kHz BPF used
—
–81.0
–70.0
dB
Crosstalk between
CT5
FORWARD and REVERSE
PBIN 1kHz –42dBm, 120µs mode,
1kHz BPF used
—
–80.0
–70.0
dB
Music Sensor
Signal detection level 1
VMS1
TAPEIN 5kHz, MS ON, G1 mode,
external constant of 39kΩ and 0.0047µF
–43.0 –40.0
–37.0 dBm
Signal detection level 2
VMS2
TAPEIN 5kHz, MS ON, G2 mode,
external constant of 3.9kΩ and 0.47µF
–63.0 –60.0
–57.0 dBm
MS output leak current
IOH
No signal, MS OFF, G1 mode
—
0.0
1.0
µA
MS output saturation
voltage
VOL
TAPEIN 5kHz –30dBm, MS ON,
G1 mode, 1mA applied to MSOUT pin
—
0.3
1.0
V
Low level
VIL
Input voltage of NRSW, INSW, TAPESW,
DRSW, MSMODE, MSSW
0.0
—
0.5
V
High level
VIH
Input voltage of NRSW, INSW, TAPESW,
DRSW, MSMODE, MSSW
2.5
—
DVCC
V
Logic Voltage
∗1 The crosstalk between TAPE and AUX is measured with a 5.1kΩ external resistor connected to AUXIN1
(Pin 5). In this condition, the crosstalk is approximately –67dB due to the signal leak from MSLPF (Pin 6).
In order to improve the crosstalk between TAPE and AUX, AUXIN1 pin should be driven with a low
impedance.
–9–
CXA2510AQ
Electrical Characteristics Measurement Circuit
S4
28
27
26
25
24
23
22
21
TAPEIN2
AUXIN2
DIREF
LINEOUT2
TCH2
NC
MSSW
DRSW 19
32 PBRIN2
TAPESW 18
INSW 17
34 PBFIN2
Power
Supply
NRSW 16
35 VCT
VCC
C3
22µ
S24
OFF: 0dB
ON: 30dB
S29
DRSW
H/L
“A” WTG
S28
TAPESW
H/L
INSW
H/L
DIN Audio
S27
NRSW
H/L
S26
MSOUT 14
37 PBFIN1
+20dB
DVCC
R30
10k S18
CCIR/ARM
39 PBRIN1
MSTC 12
LINEOUT1
TCH1
NC
G2FB
MSLPF
6
7
C15 C16
270p 2.2µ
8
9
10
R20 2.7k
C13
1µ
C18
0.1µ
AC
Voltmeter
R25
1MEG
G1FB 11
∗ R22
3.9k
∗ R23
39k
C20
0.47µ
C21
4.7n
Distortion
Analyzer
Oscilloscope
S12
C8
2.2µ
5
4
C11
1µ
∗R17 5.1k
3
AUXIN1
2
TAPEIN1
VCC
1
S11
∗ R11
18k
S8∗R15 5.1k
∗R5
12k
S7
∗ R1
300k
PBOUT1
40 PBFB1
C6
0.01µ
S25
+20dB
C22
0.1µ
∗R13 2.7k
C10 22µ
∗ R2
270
DGND 13
PBEQ1
∗R6
680
38 PBREF1
S5
DC Ammeter A
C1
2.2µ
∗ R36
50k
1kHz BPF
∗ R7
680
S1
DC
Voltmeter
MSMODE
H/L
R24
100k
C2
2.2µ
GND
S19
NC 15
36 PBGND
S2
S20
R31 10k
GND GND
MSMODE 20
33 PBREF2
C4 ∗R8
2.2µ 680
S21
R32 100
S13
R18 5.1k
29
31 PBFB2
∗ R3
270
∗ R9
680
S3
30
GND
C5
2.2µ
S22
R33 10k
MSSW
H/L
PBOUT2
C7
0.01µ
C19
0.1µ
∗
C17
2.2µ
PBEQ2
∗ R4
300k
Audio
SG
∗
∗
C14 ∗R19
1µ
18k
C12
1µ
C9
2.2µ
S23
0dB or 30dB
Amp
R21 2.7k
∗ R10 ∗R12
12k
18k
R16 5.1k S10
S8
S6
∗R14
2.7k
R35 10k
R34 100
Note
R29 10k
S17
R28 100
S16
R27 10k
S15
R26 100
S14
1. Resistor tolerance
2. Capacitor tolerance
Coupling Capacitor
– 10 –
±5%
∗: ±1%
±5%
∗: ±2%
±10%
CXA2510AQ
Application Circuit 1
30
PBFB2
C4
470p
RVS2
R6
180
R4
100k
PBRIN2
PBREF2
29
DIREF
26
27
28
C15
2.2µ
C17
0.1µ
25
23
24
MSSW
R15
18k
NC
C12
2.2µ
TAPEIN2
GND
PBEQ2
PBOUT2
R9
18k
C10
2.2µ
AUXIN2
R11
12k
C7
0.01µ
LINEOUT2
GND
GND
TCH2
AUXIN2
LINEOUT2
GND
R12 R14
300k 33k
22
21
NR
31
120µ/70µ
20
OFF/
B
19
32
T2
×1
MSMODE
DRSW
From
Microcomputer
MS MODE
NR BIAS
33
18
TAPESW
F2
RVS1
C1
470p
R5
180
PBRIN1
PBFB1
15
VCC
LPF
37
DET
MS ON/
OFF
14
F1
38
F3
×1
13
T1
39
12
OFF/
B
40
120µ/70µ
R8
18k
C6
0.01µ
2
PBOUT1
PBEQ1
1
R10
12k
5
4
3
6
R7 R13
300k 33k
AUXIN1
9
8
7
C11 C13
C14
2.2µ 0.001µ 2.2µ
C9
2.2µ
VCC
11
NR
C16
0.1µ
GND
GND
LINEOUT1
INSW
NRSW
NC
R19
MSOUT 100k
DGND
MSTC
G1FB
DVCC
To Microcomputer
DGND
C20
0.1µ
GND
R18
1MEG
10
G2FB
R1
100k
FWD/RVS
NC
PBREF1
VCT
36
TCH1
FWD1
16
NR MODE
LINEOUT1
PBFIN1
TAPE EQ
MSLPF
PBGND
17
35
AUXIN1
VCT
TAPE/AUX
34
TAPEIN1
C3 R3
470p 100k
GND
C5
22µ
GND
C2 R2
470p 100k
VCC
PBFIN2
FWD2
R16
3.9k
R17
39k
C18
0.47µ
C19
4.7n
GND
GND
C8
22µ
GND
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
– 11 –
CXA2510AQ
Application Circuit 2
PBFB2
MSSW
NC
DIREF
TCH2
22
120µ/70µ
21
20
OFF/
B
19
32
T2
×1
MSMODE
DRSW
From
Microcomputer
MS MODE
NR BIAS
33
18
TAPESW
TAPE EQ
35
16
NR MODE
VCT
FWD/RVS
36
15
VCC
LPF
37
DET
MS ON/
OFF
14
F1
38
13
F3
×1
T1
39
12
OFF/
B
120µ/70µ
40
1
C6
0.01µ
PBOUT1
R8
18k
2
R10
12k
5
4
3
6
R7
300k
C8
22µ
AUXIN1
9
8
7
C11 C13
C14
2.2µ 0.001µ 2.2µ
C9
2.2µ
VCC
11
NR
C16
0.1µ
GND
GND
LINEOUT1
INSW
NRSW
NC
R17
MSOUT 100k
DGND
MSTC
G1FB
DVCC
To Microcomputer
DGND
C20
0.1µ
GND
R16
1MEG
10
G2FB
PBFB1
17
NC
PBREF1
TAPE/AUX
34
TCH1
PBGND
R4 100k
PBRIN1
C4
470p R6
500
23
24
NR
31
PBEQ1
RVS1
PBFIN2
PBFIN1
R3
100k
25
LINEOUT1
C3
470p
C17
0.1µ
F2
VCT
C5
22µ
26
27
28
C15
2.2µ
MSLPF
GND
R13
18k
AUXIN1
C2
470p
GND
C12
2.2µ
TAPEIN1
R2
100k
FWD2
FWD1
PBRIN2
R1 100k
PBREF2
29
VCC
RVS2
GND
PBEQ2
30
R5
C1 500
470p
C10
2.2µ
PBOUT2
R9
18k
AUXIN2
R11
12k
TAPEIN2
C7
0.01µ
LINEOUT2
GND
GND
LINEOUT2
AUXIN2
GND
R12
300k
R14
3.9k
R15
39k
C18
0.47µ
C19
4.7n
GND
GND
GND
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
– 12 –
CXA2510AQ
Description of Operation
1. Signal route
24dB
NR ON
PB IN
FWD
NR OFF
TAPE
24dB
NR
AMP2
AMP1
RVS
AUX
24dB
70µs
PBFB
PBEQ PBOUT TAPEIN AUXIN
(–30dBm)
LINEOUT
(–6dB Dolby level)
Fig. 1. Signal route block diagram
AMP1 and AMP2 are operational amplifiers. AMP1 composes the playback equalizer amplifier by attaching an
external resistor and capacitor to PBFB, PBEQ and PBOUT pins.
AMP2 is an input selector and a line amplifier. The gain is 24 dB when NR is OFF.
The Dolby NR reference level is –6dBm (LINEOUT).
– 13 –
CXA2510AQ
2. Adjustment method
0
–6dBm
(Dolby level)
–10
–20
LINEOUT
–30dBm
–30
–30dBm
–40
PBOUT
–50
TAPEIN
AUXIN
VR adjustment
–60
–70
400Hz 200nWb/m: Dolby level reference tape
–80
(dBm)
PBIN (HEAD)
Fig. 2-1. Level diagram (application circuit 1)
0
–10
–6dBm
(Dolby level)
PBOUT
–20
VR adjustment
LINEOUT
–30dBm
–30
–30dBm
–40
TAPEIN
AUXIN
–50
–60
–70
400Hz 200nWb/m: Dolby level reference tape
–80
(dBm)
PBIN (HEAD)
Fig. 2-2. Level diagram (application circuit 2)
Adjust the playback equalizer amplifier gain so that –6dBm (Dolby level) is output on LINEOUT (Pins 7 and 24)
by playing back the reference tape for Dolby level adjustment.
Adjustment should be performed according to the rules of Dolby Laboratories Licensing Corporation because
this IC has the built-in Dolby NR system.
List of Calibration Cassette Tape
Dolby level is defined as 200nWb/m measured according to the ANSI high efficiency head method.
The followings are the reference tapes specified by Dolby Laboratories Licensing Corporation.
1. A-bex Laboratories, Inc. (part no. TCC-130)
2. BASF (product code 09797 XE)
3. Kaneon Corp. (LC Engineering part no. LCT-7001)
4. Standard Tape Laboratory (catalogue no. 28)
5. TEAC Corporation, Japan (part no. MTT150)
6. TEAC Corporation of America (part no. MTT150)
7. Victor Company of Japan, Ltd. (part no. TMT-6130, VTT-727)
8. Sony Corporation (part no. TY-256)
– 14 –
CXA2510AQ
3. Playback equlizer amplifier
T1
Gain (dB)
G1
PB IN
FWD
SW1
–6dB/oct
AMP1
RVS
SW2
T2
70µs
PBFB
PBEQ
R4
C1
R1
PBOUT
T3
R3
R2
PBREF
f1
Fig. 3. Playback equalizer amplifier
block diagram
f2
f3
Frequency (Hz)
Fig. 4. Playback equalizer amplifier
frequency response
The CXA2510AQ achieves the frequency response of Fig.4 with the circuit configuration shown in Fig. 3.
Two systems (FORWARD and REVERSE) of playback head input are provided for each channel.
The FORWARD input pin is selected when DRSW (Pin 19) is Low; REVERSE is selected when DRSW is
High.
The playback equalizer amplifier frequency response can be set in two levels.
When TAPESW (Pin 18) is Low, SW2 shown in Fig. 3 is turned OFF; when TAPESW is High, SW2 is turned
ON.
The external resistance R1 should be adjusted to adjust the playback equalizer amplifier gain.
The playback equalizer amplifier frequency response is all determined by the external resistance and
capacitance, and it can be obtained with the following equation.
G (s) =
1 + {s · C1 · (R1 · R2 + R2 · Rx + Rx · R1) / (R1 + R2)}
R1 + R2
·
(s = jω)
1 + s · C1 · (R2 + Rx)
R1
Where, Rx = R3 when TAPESW pin =Low;
Rx = R3//R4 when TAPESW pin = High
Using the above equation, G1 in Fig. 3 and low-frequency time constant (T1) and high-frequency time
constants (T2 and T3) are as follows:
G1 = 20log
R1 + R2
R1
T1 = C1 · (R2 + Rx)
T2, T3 =
C1 · (R1 · R2 + R2 · Rx + Rx · R1)
R1 + R2
– 15 –
CXA2510AQ
4. Music sensor
TAPEIN2
MSLPF
Vcc
DVcc
×1
R3
127k
C1
64p
R2
10k
R11
Vcc
Full-wave
rectifier
MSOUT
Smoother
AMP3
AMP1
R1
10k
R4
100k
AMP2
R5
39.1k
VGS
R6
1k
R7
11.1k
DGND
×1
DGND
TAPEIN1
G1FB
G2FB
C2
C3
R8
R9
DGND
MSTC
R10
C4
Fig. 5. Music sensor block diagram
The signal input from TAPEIN is added and amplified by AMP1. This signal is then input to the LPF (R4 and
C1). The LPF cut-off frequency can be adjusted by connecting the external capacitance to MSLPF pin. The
cut-off frequency is approximately 23kHz when MSLPF pin is left open.
The detection level and HPF cut-off frequency are determined with the external resistance and capacitance
connected to G1FB or G2FB at AMP2, and the signal is converted to a current.
The signal is full-wave rectified and is converted to a voltage by the internal resistance R5.
The full-wave rectified signal is smoothed. The internal resistance (R6) and external capacitance (C4)
determine the smoothing response time. The recovery time is determined by the external resistance (R10) and
capacitance (C4).
The AMP3 comparator detects whether the smoothed signal is greater or smaller than the comparator
threshold.
The comparator has approximately 2dB hysteresis.
The table below shows the example of the constant and characteristics for the external resistance and
capacitance connected to G1FB and G2FB.
R
C
Music signal detection level
Music signal interval
detection level
Cut-off frequency
FF/REW (G1)
39kΩ 0.0047µF
–39.5dBm
–41.4dBm
870Hz
Playback (G2)
3.9kΩ
–59.5dBm
–61.4dBm
87Hz
0.47µF
Detection level
(dBm)
G1 (FF)
–39.5
G2 (NOR)
–59.5
87 870
Frequency (Hz)
Fig. 6. Music sensor circuit frequency response
– 16 –
CXA2510AQ
5. Operating mode control method
The CXA2510AQ has a Dolby NR switch (NRSW), playback equalizer amplifier select switch (TAPESW), head
input select switch (DRSW), music sensor mode select switch (MSMODE) and music sensor switch (MSSW).
The operating modes for each switch are shown in the following table.
Pin No.
Pin voltage
Pin name
Low (OPEN)
High
16
NRSW
Dolby NR OFF
Dolby NR ON
17
INSW
TAPE
AUX
18
TAPESW
120µs
70µs
19
DRSW
PBIN FORWARD
PBIN REVERSE
20
MSMODE
G1
G2
21
MSSW
MS ON
MS OFF
Notes on Operation
1. Dolby NR
Dolby NR functions by using the current that flows into DIREF (Pin 25) as standard.
The Dolby NR attack/recovery time is determined by the capacitance connected to TCH (Pins 8 and 23).
Use the parts connected to these pins with high accuracy and small temperature characteristics.
(It is recommended that the resistance tolerance of 2% <metal-oxide> and capacitance tolerance of 10%
<film>.)
2. Playback equalizer amplifier
All playback equalizer amplifier characteristics are determined by the external constants. Use the parts
which satisfies the accuracy required for the playback equalizer amplifier.
3. Music sensor
The current on DIREF (Pin 25), and the resistance and capacitance connected to G2FB (Pin 10) and G1FB
(Pin 11) determine the detection level and the HPF cut-off frequency.
The response time is determined by the resistance and capacitance connected to MSTC (Pin 12).
Use the parts which satisfies the accuracy required for the music sensor.
– 17 –
CXA2510AQ
Example of Representative Characteristics
Current consumption vs. Supply voltage
Current consumption [mA]
Ta = 25°C
12.0
11.5
No input signal
NR OFF, MS ON
11.0
7.0
8.0
9.0
10.0
11.0
Supply voltage [V]
Playback equalizer amplifier frequency response
PBFIN1
Ta = 25°C
60
Gain [dB]
47µ
680
70µs
PBFB1
PBREF
PBEQ1
50
0.01µ
40
18k
12k
120µs
30
70µs
VCC = 8.0V
Output level of –25dBm constant
100
1k
270
Decode boost [dB]
VCC = 8.0V
0dB = Dolby Level
–40dB
10
–30dB
8
6
–20dB
4
2
–10dB
Ta = 25°C
0
0dB
100
1K
2.2µ
Fig. 7. Measurement circuit of playback equalizer
amplifier frequency response
B type decode boost characteristics
12
300k
PBREF
10k
Frequency [Hz]
PBOUT1
10K
Frequency [Hz]
– 18 –
CXA2510AQ
B type total harmonic distortion (including NR OFF)
Total harmonic distortion (playback equalizer amplifier)
100
Total harmonic distortion [%]
Total harmonic distortion [%]
100
Ta = 25°C
VCC = 8.0V
Input: PBFIN1
Output: PBOUT1
RL = 2.7kΩ
10–1
f = 10kHz
10–2
10–1
–20 –16 –12
–8
–4
0
4
NR B
f = 100Hz
NR OFF
f = 1kHz
f = 100Hz
NR B
f = 1kHz
10–2
f = 1kHz
Ta = 25°C
Input: TAPEIN1
Output: LINEOUT1
VCC = 8.0V
RL = 2.7kΩ
0dB = Dolby Level
NR B
f = 10kHz
8
Output level [dBm]
–10
–6
–2
2
6
10
14
Output level [dB]
Ripple rejection ratio (LINEOUT)
–40
–20
Ta = 25°C
VCC = 8.0V
RL = 2.7kΩ
Ripple rejection ratio [dB]
Ripple rejection ratio [dB]
Ripple rejection ratio (PBOUT)
–50
–60
100
1k
10k
–30
NR OFF
–40
NR B
–50
100
Frequency [Hz]
Ta = 25°C
VCC = 8.0V
RL = 2.7kΩ
1k
Frequency [Hz]
– 19 –
10k
CXA2510AQ
Crosstalk between channels (1ch → 2ch)
0
Crosstalk [dB]
–20
–40
24dB
VCC = 8.0V
Input: PBFIN1
Output: LINEOUT2
(LINEOUT1 level = 0dBm)
NR OFF
PBFIN1
47µ
680
PBOUT1
–60
PBEQ1
PBREF
–80
TAPEIN1
12k
LINEOUT1
2.2µ
–100
300k
270
–120
100
1k
10k
PBREF
Frequency [Hz]
Fig. 8. Measurement circuit of crosstalk
between channels
Music signal and signal interval detection level
frequency response
Ta = 25°C
VCC = 8.0V
Input: TAPEIN1
G1: R = 39kΩ, C = 4.7nF
G2: R = 3.9kΩ, C = 0.47µF
0
Input level [dBm]
–10
–20
Music signal detection level
–30
G1
–40
–50
Music signal interval detection level
Music signal detection level G2
–60
Music signal interval detection level
100
1k
10k
Frequency [Hz]
HPF connection resistance in MS block vs.
Music signal and signal interval detection level characteristics
Input level [dBm]
–30
Ta = 25°C
VCC = 8.0V
f = 5kHz
Input: TAPEIN1
–40
–50
Music signal
detection level
Music signal interval
detection level
–60
–70
1k
10k
100k
HPF connection resistance [Ω]
– 20 –
CXA2510AQ
Package Outline
Unit: mm
40PIN QFP (PLASTIC)
+ 0.35
1.5 – 0.15
+ 0.1
0.127 – 0.05
9.0 ± 0.4
+ 0.4
7.0 – 0.1
0.1
21
30
20
31
A
11
40
1
+ 0.15
0.3 – 0.1
0.65
10
± 0.12 M
0.5 ± 0.2
(8.0)
+ 0.15
0.1 – 0.1
DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL
EPOXY RESIN
SONY CODE
QFP-40P-L01
LEAD TREATMENT
SOLDER / PALLADIUM
PLATING
EIAJ CODE
QFP040-P-0707
LEAD MATERIAL
42/COPPER ALLOY
PACKAGE MASS
0.2g
JEDEC CODE
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
– 21 –