SONY CXA2511AQ

CXA2511AQ
Dolby∗ B-C Type Noise Reduction System with Playback Equalizer Amplifier
Description
The CXA2511AQ is an IC designed for use in car
stereo cassette decks. Functions include Dolby B-C
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 type NR
system (CXA2510AQ) and no Dolby NR system
(CXA2509AQ)
• Dolby B-C 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–
E96828-PS
CXA2511AQ
PBEQ2
PBOUT2
GND
TAPEIN2
AUXIN2
DIREF
LINEOUT2
TCH2
TCL2
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/C
19 DRSW
PBRIN2 32
×1
T2
MS MODE
NR BIAS
PBREF2 33
18 TAPESW
F2
TAPE/AUX
PBFIN2 34
17 INSW
TAPE EQ
VCT 35
NR MODE
VCT
16 NRSW
FWD/RVS
PBGND 36
15 NRMODE
VCC
MS ON/
OFF
LPF
PBFIN1 37
DET
14 MSOUT
F1
PBREF1 38
×1
F3
13 DGND
T1
PBRIN1 39
12 MSTC
OFF/
B/C
PBFB1 40
120µ/70µ
11 G1FB
1
2
3
4
5
6
7
8
9
10
PBEQ1
PBOUT1
VCC
TAPEIN1
AUXIN1
MSLPF
LINEOUT1
TCH1
TCL1
G2FB
NR
–2–
CXA2511AQ
Pin Description
Pin
No.
Symbol
(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)
Typical pin voltage
DC
AC
I/O
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
Cut-off frequency
adjustment of the
music sensor LPF
100k
6
MSLPF
4.0V
—
—
100kΩ
6
147
64p
GND
–3–
CXA2511AQ
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
147
—
200
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
13.5k
9
22
TCL1
TCL2
0.3V
—
—
—
Time constant for
the LLS
147
9
22
480k
GND
Vcc
10
11
G2FB
G1FB
Music signal
interval detection
level setting
500
4.0V
—
—
—
147
10
11
500
GND
13
DGND
0.0V
—
—
Logic ground
(Connect to GND.)
—
–4–
CXA2511AQ
Pin
No.
Symbol
Typical pin voltage
DC
I/O
AC
I/O
resistance
Equivalent circuit
Description
Vcc
12
MSTC
—
—
—
147
—
Time constant for
detecting the
music signal
interval
853
12
10k
DGND
GND
Vcc
14
MSOUT
0.2V
when a
signal is
detected;
DVcc
when no
signal is
detected
DVcc
100k
—
O
—
DGND
15
17
GND
Vcc
NRMODE
INSW
Music sensor
output
147
14
0.0V
when
open
15
—
I
100kΩ
Line amplifier input
select control
Low (open): TAPEIN
High: AUXIN
1.1k
17
21
100k
DGND
21
16
18
MSSW
GND
Vcc
NRSW
TAPESW
0.0V
when
open
16
—
I
100kΩ
100k
DGND
19
DRSW
GND
–5–
Music sensor control
Low (open):
MS ON
High: MS OFF
Dolby NR control
Low (open):
NR OFF
High: NR ON
Playback equalizer
amplifier control
Low (open): 120µs
High: 70µs
1.1k
18
19
Dolby NR mode control
Low (open):
Dolby B type NR
High: Dolby C type NR
Head select control
Low (open):
FORWARD
High: REVERSE
CXA2511AQ
Pin
No.
Symbol
Typical pin voltage
DC
I/O
AC
I/O
resistance
Equivalent circuit
Description
Vcc
20
MSMODE
0.0V
when
open
Music sensor
mode control
Low (open): G1
High: G2
1.1k
—
I
100kΩ
20
100k
DGND
GND
Vcc
25
DIREF
1.2V
—
—
Resistance for
setting the Dolby
NR reference
current
(Connects 20kΩ
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
34
4.0V
34
37
31
39
–70dBm
I
50p
50p
40
Playback
equalizer amplifier
input (REVERSE
head connected)
36
—
PBREF
PBREF
GND
PBFIN2
PBFIN1
–6–
Playback
equalizer amplifier
input (FORWARD
head connected)
CXA2511AQ
Pin
No.
Symbol
Typical pin voltage
DC
I/O
AC
I/O
resistance
Equivalent circuit
Description
Vcc
33
38
PBREF2
PBREF1
Playback
equalizer amplifier
reference (Vcc/2
output)
200
4.0V
—
O
—
33
38
200
GND
Vcc
30k
147
35
VCT
4.0V
—
O
—
VGS
×1
35
Center
(Vcc/2 output)
45k
30k
GND
36
PBGND
0.0V
—
—
Playback
equalizer amplifier
ground (Connect
to ground.)
—
–7–
CXA2511AQ
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
13.0
19.2
25.0
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 B
1.4
2.9
4.4
dB
B type decode boost
characteristics 2
BP2
TAPEIN 2kHz, LINEOUT –25dB, NR B
5.5
7.0
8.5
dB
B type decode boost
characteristics 3
BP3
TAPEIN 5kHz, LINEOUT –25dB, NR B
3.9
5.4
6.9
dB
B type decode boost
characteristics 4
BP4
TAPEIN 10kHz, LINEOUT –40dB, NR B
9.7
10.4
11.9
dB
B type decode boost
characteristics 5
BP5
TAPEIN 10kHz, LINEOUT 0dB, NR B
–1.1
0.4
1.9
dB
C type decode boost
characteristics 1
CP1
TAPEIN 500Hz, LINEOUT –60dB, NR C
14.2
16.2
18.2
dB
C type decode boost
characteristics 2
CP2
TAPEIN 500Hz, LINEOUT –25dB, NR C
7.2
9.2
11.2
dB
C type decode boost
characteristics 3
CP3
TAPEIN 2kHz, LINEOUT –60dB, NR C
18.7
20.7
22.7
dB
C type decode boost
characteristics 4
CP4
TAPEIN 2kHz, LINEOUT –25dB, NR C
5.4
7.4
9.4
dB
C type decode boost
characteristics 5
CP5
TAPEIN 5kHz, LINEOUT –25dB, NR C
3.5
5.5
7.5
dB
C type decode boost
characteristics 6
CP6
TAPEIN 10kHz, LINEOUT 0dB, NR C
–5.5
–3.5
–1.5
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 B,
RL = 2.7kΩ
—
0.04
0.2
%
Total harmonic
distortion 3
THD3
TAPEIN 1kHz –20dBm, NR C,
RL = 2.7kΩ
—
0.05
0.3
%
Decode S/N ratio 1
SN1
No signal, NR B, Rg = 5.1kΩ,
CCIR/ARM filter used
77.0
87.0
—
dB
Decode S/N ratio 2
SN2
No signal, NR C, Rg = 5.1kΩ,
CCIR/ARM filter used
80.0
82.0
—
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
–8–
CXA2511AQ
Item
Symbol
Measurement conditions
Min.
Crosstalk between
TAPE and AUX
CT3
TAPE (AUX) IN 1kHz –24dBm,
NR OFF, AUX (TAPE) mode,
1kHz BPF used ∗1
Output DC offset voltage
VOS1
No signal, NR OFF, difference from VCT
–0.1
—
Max.
Unit
–67.0 –65.0
dB
Typ.
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
Output DC offset voltage VOS2
No signal, 120µs mode, Rg = 680Ω,
difference from VCT
–1.0
0.0
1.0
V
Crosstalk between
channels
CT4
PBIN 1kHz –52dBm, 120µs mode,
1kHz BPF used
—
–81.0 –70.0
dB
Crosstalk between
CT5
FORWARD and REVERSE
PBIN 1kHz –52dBm, 120µs mode,
1kHz BPF used
—
–80.0 –70.0
dB
Total harmonic distortion THD4
S/N ratio
SN3
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 NRMODE, NRSW, INSW,
TAPESW, DRSW, MSMODE, MSSW
0.0
—
0.5
V
High level
VIH
Input voltage of NRMODE, 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–
CXA2511AQ
Electrical Characteristics Measurement Circuit
S4
S3
C4 ∗ R8
2.2µ 680
27
26
25
24
23
22
AUXIN2
DIREF
LINEOUT2
TCH2
TCL2
DRSW 19
TAPESW 18
37 PBFIN1
∗ R7
680
∗ R36
50k
S24
OFF: 0dB
ON: 30dB
S29
DRSW
H/L
“A” WTG
S28
TAPESW
H/L
INSW
H/L
DIN Audio
S27
NRSW
H/L
NRMODE
H/L
R24
100k
1kHz BPF
S26
+20dB
DVCC
R30
10k S18
CCIR/ARM
MSTC 12
∗
∗
TCH1
TCL1
G2FB
MSLPF
6
7
C15 C16
270p 2.2µ
8
9
10
AC
Voltmeter
R25
1MEG
G1FB 11
R20 2.7k
∗
C13
1µ
S25
+20dB
C24
0.1µ
∗ R22
3.9k
∗ R23
39k
C18 C20
C22
0.1µ 0.068µ 0.47µ
C23
4.7n
Distortion
Analyzer
Oscilloscope
S12
5
4
C11
1µ
R17 5.1k
3
S11
2
∗ R11 C8
18k 2.2µ
S8 R15 5.1k
∗ R5
12k
C10 22µ
∗ R1
300k
AUXIN1
1
40 PBFB1
C6
0.01µ
LINEOUT1
39 PBRIN1
TAPEIN1
DGND 13
VCC
38 PBREF1
S7
∗ R6
680
PBOUT1
∗ R2
270
DC
Voltmeter
MSMODE
H/L
MSOUT 14
R13 2.7k
S1
C1
2.2µ
NRMODE 15
PBEQ1
GND
NRSW 16
S5
S2
DC Ammeter A
INSW 17
36 PBGND
C2
2.2µ
S19
GND GND
MSMODE 20
35 VCT
C3
22µ
S20
R31 10k
21
34 PBFIN2
VCC
S21
R32 100
MSSW
H/L
MSSW
28
32 PBRIN2
∗ R9
680
33 PBREF2
Power
Supply
S22
R33 10k
S13
R18 5.1k
29
TAPEIN2
C5
2.2µ
30
31 PBFB2
∗ R3
270
C21
0.068µ
C17
2.2µ
GND
C7
0.01µ
C19
0.1µ
∗
∗∗
R19
20k
PBOUT2
∗ R4
300k
Audio
SG
∗
C14
1µ
C12
1µ
C9
2.2µ
R21 2.7k
∗R12
18k
S23
0dB or 30dB
Amp
PBEQ2
∗R10
12k
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%
CXA2511AQ
Application Circuit 1
PBFB2
RVS2
R6
180
R4
100k
PBRIN2
PBREF2
29
28
26
27
25
GND
C17
0.1µ
C19
0.068µ
23
24
MSSW
C15
2.2µ
AUXIN2
R15
20k
LINEOUT2
C12
2.2µ
TAPEIN2
GND
PBEQ2
30
C4
470p
C10
2.2µ
PBOUT2
R9
18k
DIREF
R11
12k
C7
0.01µ
LINEOUT2
GND
GND
TCL2
AUXIN2
TCH2
GND
R12 R14
300k 33k
22
21
NR
31
120µ/70µ
20
OFF/
B/C
19
32
T2
×1
MSMODE
DRSW
From
Microcomputer
MS MODE
NR BIAS
33
18
TAPESW
F2
PBRIN1
PBFB1
37
DET
MS ON/
OFF
14
F1
38
F3
×1
13
T1
39
12
OFF/
B/C
40
120µ/70µ
R8
18k
C6
0.01µ
2
PBOUT1
PBEQ1
1
R10
12k
5
4
3
C9
2.2µ
6
7
C11 C13 C14
2.2µ 0.001µ 2.2µ
R7 R13
300k 33k
AUXIN1
VCC
11
NR
9
8
C16 C18
0.1µ 0.068µ
GND
GND
LINEOUT1
INSW
NRSW
NRMODE
R19
MSOUT 100k
DGND
MSTC
DVCC
To Microcomputer
DGND
C22
0.1µ
GND
G1FB
R18
1MEG
10
G2FB
R5
180
LPF
TCL1
C1
470p
15
VCC
MSLPF
RVS1
FWD/RVS
36
AUXIN1
PBREF1
16
NR MODE
TAPEIN1
PBFIN1
FWD1
R1
100k
TAPE EQ
35
VCT
PBGND
17
TCH1
VCT
TAPE/AUX
34
VCC
C3 R3
470p 100k
GND
C5
22µ
GND
C2 R2
470p 100k
LINEOUT1
PBFIN2
FWD2
R16
3.9k
R17
39k
C20
0.47µ
C21
4.7n
GND 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 –
CXA2511AQ
Application Circuit 2
PBFB2
MSSW
LINEOUT2
AUXIN2
TCL2
23
24
22
120µ/70µ
21
20
OFF/
B/C
19
32
×1
T2
MSMODE
DRSW
From
Microcomputer
MS MODE
NR BIAS
33
18
TAPESW
R4 100k
PBRIN1
PBFB1
TAPE EQ
35
16
NR MODE
VCT
FWD/RVS
36
15
VCC
LPF
37
DET
MS ON/
OFF
14
F1
38
×1
F3
13
T1
39
12
OFF/
B/C
40
120µ/70µ
1
C6
0.01µ
PBOUT1
R8
18k
2
R10
12k
5
4
3
C9
2.2µ
R7
300k
VCC
11
NR
6
7
C11 C13 C14
2.2µ 0.001µ 2.2µ
C8 AUXIN1
22µ
9
8
C16 C18
0.1µ 0.068µ
GND
GND
LINEOUT1
INSW
NRSW
NRMODE
R17
MSOUT 100k
DGND
MSTC
DVCC
To Microcomputer
DGND
C22
0.1µ
GND
G1FB
R16
1MEG
10
G2FB
R3
100k PBREF1
17
TCL1
PBGND
TAPE/AUX
34
TCH1
PBFIN2
PBFIN1
C4 R6
470p 500
25
C19
0.068µ
NR
31
PBEQ1
RVS1
26
C17
0.1µ
LINEOUT1
C3
470p
27
GND
F2
VCT
C5
22µ
C15
2.2µ
MSLPF
GND
R13
20k
AUXIN1
C2
470p
GND
C12
2.2µ
TAPEIN1
R2
100k
FWD2
FWD1
PBRIN2
R1 100k
PBREF2
28
VCC
RVS2
29
GND
PBEQ2
30
R5
C1 500
470p
C10
2.2µ
PBOUT2
R9
18k
LINEOUT2
GND
GND
DIREF
R11
12k
TAPEIN2
C7
0.01µ
GND
TCH2
AUXIN2
R12
300k
R14
3.9k
R15
39k
C20
0.47µ
C21
4.7n
GND 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 –
CXA2511AQ
Description of Operation
1. Signal route
24dB
NR ON
PB IN
NR OFF
TAPE
AUX
24dB
24dB
FWD
AMP1
RVS
NR
AMP2
70µs
PBFB
PBEQ PBOUT TAPEIN AUXIN
(–30dBm)
LINEOUT
(–6dBm 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 24dB when NR is OFF.
The Dolby NR reference level is –6dBm (LINEOUT).
– 13 –
CXA2511AQ
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 –
CXA2511AQ
3. Playback equalizer amplifier
T1
Gain (dB)
G1
PB IN
FWD
SW1
–6dB/oct
AMP1
RVS
SW2
70µs
PBFB
T2
PBEQ
R4
C1
PBOUT
T3
R3
R1
R2
PBREF
f1
Fig. 3. Playback equalizer amplifier
block diagram
f2
f3
Frequency [Hz]
Fig. 4. Playback equalizer amplifier
frequency response
The CXA2511AQ 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) =
R1 + R2
·
R1
1 + {s · C1 · (R1 · R2 + R2 · Rx + Rx · R1) / (R1 + R2)}
(s = jω)
1 + s · C1 · (R2 + Rx)
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 –
CXA2511AQ
4. Music sensor
TAPEIN2
MSLPF
Vcc
DVcc
×1
R3
127k
Vcc
C1
64p
R2
10k
R11
Full-wave
rectifier
MSOUT
Smoother
AMP3
AMP1
R1
10k
R4
100k
AMP2
R5
39.1k
VGS
R6
1k
R7
11.1k
DGND
×1
DGND
DGND
G2FB
G1FB
TAPEIN1
C2
C3
R8
R9
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
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 –
CXA2511AQ
5. Operating mode control method
The CXA2511AQ has a Dolby NR mode select switch (NRMODE), 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
Dolby B type NR
Dolby C type NR
15
NRMODE
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)
and TCL (Pins 9 and 22).
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 –
CXA2511AQ
Example of Representative Characteristics
Current consumption vs. Supply voltage
Current consumption [mA]
Ta = 25°C
20
19
No input signal
NR OFF, MS ON
18
7.0
8.0
9.0
10.0
11.0
Supply voltage [V]
Playback equalizer amplifier frequency response
PBFIN1
Ta = 25°C
60
47µ
680
70µs
PBFB1
PBREF
PBEQ1
Gain [dB]
50
40
PBOUT1
18k
0.01µ
120µs
30
VCC = 8.0V
Output level of –25dBm constant
12k
70µs
270
100
1k
300k
2.2µ
10k
PBREF
Frequency [Hz]
Fig. 7. Measurement circuit of playback equalizer
amplifier frequency response
B type decode boost characteristics
10
VCC = 8.0V
0dB = Dolby Level
8
–30dB
6
–20dB
4
2
20
–40dB
Ta = 25°C
–10dB
0
Decode boost [dB]
Decode boost [dB]
12
C type decode boost characteristics
100
1k
10k
–50dB
12
–40dB
8
–30dB
4
–20dB
0
–10dB
Ta = 25°C
100
Frequency [Hz]
–60dB
16
–4
0dB
VCC = 8.0V
0dB = Dolby Level
0dB
1k
Frequency [Hz]
– 18 –
10k
CXA2511AQ
Total harmonic distortion (playback equalizer amplifier)
Total harmonic distortion [%]
100
Ta = 25°C
V
CC =
= 8.0V
8.0V
VCC
Input:
Input: PBFIN1
PBFIN1
Output:
Output: PBOUT1
PBOUT1
R
RLL == 2.7kΩ
2.7kΩ
10–1
f = 10kHz
10–2
f = 100Hz
f = 1kHz
–20 –16 –12
–8
–4
0
4
8
Output level [dBm]
B type total harmonic distortion (including NR OFF)
10–1
NR B
f = 1kHz
Input:
Input: TAPEIN1
TAPEIN1
Output:LINEOUT1
LINEOUT1
101 Output:
VVCC
CC==8.0V
8.0V
RRLL==2.7kΩ
2.7kΩ
0dB
0dB==Dolby
DolbyLevel
Level
Total harmonic distortion [%]
Total harmonic distortion [%]
100
C type total harmonic distortion
Ta = 25°C
Input:
Input: TAPEIN1
TAPEIN1
Ouptut:
Ouptut:LINEOUT1
LINEOUT1
VVCC
CC==8.0V
8.0V
RRLL==2.7kΩ
2.7kΩ
0dB
0dB==Dolby
DolbyLevel
Level
NR B
f = 100Hz
NR C
f = 10kHz
100
NR C
f = 100Hz
10–1
NR B
f = 10kHz
10–2
Ta = 25°C
NR C
f = 1kHz
NR OFF
f = 1kHz
–10
–6
–2
2
6
10
14
–10
Output level [dBm]
–6
–2
2
6
Output level [dBm]
– 19 –
10
14
CXA2511AQ
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
Ta = 25°C
VCC = 8.0V
RL = 2.7kΩ
–30
NR OFF
–40
NR B
–50
NR C
100
1k
10k
100
1k
Frequency [Hz]
10k
Frequency [Hz]
24dB
Crosstalk between channels (1ch → 2ch)
PBFIN1
0
Crosstalk [dB]
–20
–40
VCC = 8.0V
Input: PBFIN1
Output: LINEOUT2
(LINEOUT1 output level = 0dBm)
NR OFF
47µ
680
PBOUT1
–60
PBEQ1
PBREF
TAPEIN1
–80
12k
LINEOUT1
2.2µ
–100
300k
–120
100
1k
270
10k
Frequency [Hz]
PBREF
Fig. 8. Measurement circuit of crosstalk
between channels
Music signal and signal interval detection level
frequency response
Input level [dBm]
–10
–20
Ta = 25°C
VCC
CC = 8.0V
Input: TAPEIN1
G1: R = 39kΩ, C = 4.7nF
G2: R = 3.9kΩ, C = 0.47µF
Music signal detection level
–30
G1
–40
–50
Music signal interval detection level
Music signal detection level G2
–60
–30
Input level [dBm]
–0
HPF connection resistance in MS block vs.
Music signal and signal interval detection level characteristics
Ta = 25°C
VCC = 8.0V
f = 5kHz
Input: TAPEIN1
–40
–50
Music signal
detection level
Music signal interval
detection level
–60
Music signal interval detection level
100
1k
10k
–70
Frequency [Hz]
1k
10k
HPF connection resistance [Ω]
– 20 –
100k
CXA2511AQ
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
COPPER / 42 ALLOY
PACKAGE WEIGHT
0.2g
JEDEC CODE
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
– 21 –