--1--
E94913B27
Absolute Maximum Ratings (Ta=25C)
Supply voltage
V
CC
12
V
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
65 to +150
C
Allowable power dissipation
P
D
430
mW
Recommended Operating Condition
Supply voltage
V
CC
6.5 to 11
V
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.
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)
Structure
Bipolar silicon monolithic IC
Dolby B Type Noise Reduction System with Playback Equalizer
32 pin QFP (Plastic)
CXA1980Q
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.
--2--
CXA1980Q
Block Diagram and Pin Configuration
DRSW
NRSW
MSSW
MODESW
G1 (FF)
G2 (NOR)
MSTC
MSOUT
T
APESW
TC
1
LI
N
E
O
U
T
1
VC
T
T
APEI
N
1
GN
D
PBO
U
T
1
PBT
C
1
PBFB1
PBRIN1
PBFIN1
PBGND
E IREF
PBFIN2
PBRIN2
PBFB2
MS
G
N
D
TC
2
LI
N
E
O
U
T
2
D I
R
E
F
T
APEI
N
2
V
CC
PBO
U
T
2
PBT
C
2
DET
MODE
MS
LPF
NR
DA
TAPE
1
2
3
4
5
6
7
8
17
18
19
20
21
22
23
24
9
10
11
12
13
14
15
16
25
26
27
28
29
30
31
32
NR
NR
300k
300k
300k
300k
10dB
--3--
CXA1980Q
Pin Description
(Ta=25C, V
CC
=8.0V, no signal)
Pin
Symbol
DC value
Z (in)
Equivalent circuit
Description
No.
1
PBTC
--
--
24
2
PBOUT
2.8V
--
23
25
PBFB
1.4V
150k
32
26
PBIN
0V
70k
27
30
31
3
V
CC
8.0V
--
4
TAPEIN
4.0V
40k
21
5
D IREF
1.25V
--
PBEQ capacitance
PBEQ output
PBEQ feed back
PBEQ input
Power supply
Tape input
Connection of reference
current setting resistor for
Dolby block
147
42
30
V
CC
GND
1
24
147
V
CC
GND
40k
15
to VGS
4
21
10P
147
50A
1.25V
V
CC
GND
8k
5
Refer for page 6
--4--
CXA1980Q
Pin
Symbol
DC value
Z (in)
Equivalent circuit
Description
No.
6
LINEOUT
4.0V
--
19
7
TC
0.3V
--
18
9
MSOUT
0.0V for
--
signal
detection;
5.0V for
no signal
detection
10
MSTC
1.4V for
--
signal
detection;
5.0V for
no signal
detection
11
G2(NOR)
4.0V
--
12
G1(FF)
Line output
Connection of time constant
of level detector
MS output
Connection of MS detection
time constant
MS feed back
147
V
CC
GND
200
200
6
19
V
CC
GND
20k
6
600k
0.5
0.5
147
2
7
18
147
V
CC
GND
10k
V
DD
=5V
9
147
V
CC
GND
1k
50
V
DD
10
100k
147
V
CC
GND
100
10
11
12
--5--
CXA1980Q
Pin
Symbol
DC value
Z (in)
Equivalent circuit
Description
No.
13
MODESW
--
--
15
NRSW
16
DRSW
17
TAPESW
14
MSSW
--
--
20
VCT
4.0V
--
22
GND
0.0V
--
8
MSGND
28
PBGND
29
E IREF
1.25V
--
Refer to page 6
Refer to page 6
V
CC
/2 output
Ground
Connection of reference
current setting resistor for
PBEQ block.
147
V
CC
GND
50
15
13
16
17
147
V
CC
GND
50
50
14
147
V
CC
GND
to VGS
45k
30k
30k
50
20
147
10
1.25V
V
CC
GND
29
--6--
CXA1980Q
PBOUT, PBFB, PBIN equivalent circuit
Description for SW pins
MODESW -- Switching of MS signal detection/blank detection
High: G1 (signal detection); Low: G2 (blank detection)
NRSW
-- Switching of Dolby B type noise reduction ON/OFF
High: noise reduction OFF; Low: Dolby B
DRSW
-- Switching of tape rotation
High: reverse; Low: forward
TAPESW -- Switching of HIGH/NORMAL tape
High: NORMAL tape; Low: HIGH tape
MSSW
-- Switching of MS ON/OFF
High: MS ON; Low: MS OFF
OUT
FB
IN
147
147
147
70k
300k
300k
1k
1k
V
CC
V
REG
GND
25P
--7--
CXA1980Q
Electrical Characteristics
(Ta=25C, V
CC
=8.0V, RL: output load resistance, Rg: head equivalent impedance)
120s, FWD mode, NR OFF, MS OFF unless otherwise specified.
Item
Symbol
Measurement conditions
Min.
Typ.
Max.
Unit
(input pin, input level, frequency etc.)
Current consumption
TAPE IN input sensitivity
Decode boost 1
Decode boost 2
Decode boost 3
Decode boost 4
Decode boost 5
TAPEIN total harmonic distortion 1
TAPEIN total harmonic distortion 2
Decode S/N ratio
Signal handling
Cross talk TAPE 1ch
2ch
LINEOUT offset voltage
120s FWD frequency characteristics
120s FWD frequency characteristics
70s FWD frequency characteristics
120s RVS frequency characteristics
Signal handling
Total harmonic distortion
S/N ratio
Output offset voltage
Cross talk between channels
Cross talk between RVS and FWD
Signal detection level 1
Signal detection level 2
MS output leak current
MS output saturation voltage
Logic voltage
I
CC
V
TIN
BP1
BP2
BP3
BP4
BP5
THD1
THD2
SN1
V
OMAX
1
CT
Vos1
PBREF
F120F
F70F
F120R
V
OMAX
2
THD5
SN2
Vos2
CT4
CT5
VMS1
VMS2
I
OH
V
OL
V
IL
V
IH
No signal
LINEOUT= 0 dB 1kHz
TAPE IN 500Hz NR-ON Vlo=25dB
TAPE IN 2kHz NR-ON Vlo=25dB
TAPE IN 5kHz NR-ON Vlo=25dB
TAPE IN 10kHz NR-ON Vlo=40dB
TAPE IN 10kHz NR-ON Vlo=0dB
TAPE IN 20dBm 1kHz RL=2.7k
TAPE IN 20dBm 1kHz NR-ON RL=2.7k
No signal NR-ON CCIR/ARM filter
1kHz THD=1% RL=2.7k
TAPE IN 24dBm 1kHz
No signal
PB F IN 315Hz 70dBm VPBO=0dB
PB F IN 2.7kHz 58.5dBm for 315Hz
PB F IN 4.5kHz 53.8dBm for 315Hz
PB R IN 315Hz 70dBm for 315Hz
PB F IN 1kHz THD=1% RL=2.7k
PB F IN 1kHz 52dBm RL=2.7k
No signal "A" weighting filter
No signal Rg=2.2k
PB IN 1kHz 42dBm
TAPE IN 5kHz MS-ON G1 (10k
, 0.015F)
TAPE IN 5kHz MS ON G2 (1k
, 1.5F)
TAPE IN 5kHz 10dBm, 5V applied to MSOUT
TAPE IN 5kHz 30dBm, 1mA applied to MSOUT
AUXSW, MODESW, INSW, MSSW,
TAPESW, NRSW, DRSW
9.0
12.4
16.0
mA
32.0
30.0
28.0
dBm
1.4
2.9
4.4
5.5
6.4
8.5
3.9
5.2
6.9
dB
9.7
10.4
11.9
1.1
0.4
1.9
--
0.03
0.2
%
--
0.04
0.2
77.0
82.8
--
13.0
14.4
--
dB
--
67
55
3.9
4.0
4.1
V
27.0
25.0
23.0
dBm
1.5
0.0
1.5
dB
1.0
0.0
1.0
10.0
3.0
--
dBm
--
0.07
0.5
%
55.0
58.0
--
dB
2.4
2.8
3.2
V
78
70
dB
71
65
44.3
39.3
33.0
dBm
63.5
58.5
53.5
--
0.0
1.0
A
--
0.28
1.0
0.0
--
0.5
V
2.5
--
V
CC
Playback equalizer amplifier block
Dolby block (Dolby level 6dBm=0dB)
Interval detection between tracks (MUSIC SENSOR) block
--8--
CXA1980Q
Operation mode control (TAPESW, DRSW, NRSW, MSSW, MODESW)
The CXA1980Q has built in electronic switch circuits and the operations are controlled by the direct current
applied to each SW pin. The operation mode state for each switch is shown in the table below.
Click noise can be reduced by the external CR time constant circuit for NR SW switching.
SW
Function for Low input
Function for High input
TAPESW
70S
120s
DRSW
PB FWD
PB RVS
NRSW
DOLBY B NR
NR OFF
MSSW
MS OFF
MS ON
MODESW
G2(NOR) MODE
G1(FF) MODE
--
9
--
CXA1980Q
Electrical Characteristic Measurement Circuit
T
APESW DRSW
NRSW
MSSW
MODESW
G1(FF)
G2(NOR)
MSTC
MSOUT
MSGND
TC2
LINEOUT2
D IREF
T
APEIN2
V
CC
PBOUT2
TC1
LINEOUT1
VCT
T
APEIN1
GND
PBOUT1
PBTC1
PBFB1
PBRIN1
PBFIN1
PBGND
E IREF
PBFIN2
PBRIN2
PBFB2
PBTC2
CXA1980Q
0.1
C23
R29
2.7k
2.2
C19
R28
18k
R18
183.5k
C9
1
R33
1MEG
0.1
C25
R39
R38
S20
S21
R37
S22
R36
S23
R35
S24
R34
S25
10K
100
100
10k
100
10k
C26
1.5
R31
1k
R32
10k
C27
0.015
V7
V6
V5
V3
0.1
C24
C29
10
C18
1
C13
R17
5.1k
1
C10
S5
S6
2.7k
R1
1
2.7k
R14
270
R12
270
R13
33
C2
10n
C8
S1
S2
2.2k
R10
C6
4.7
C5
R15
S4
R7
C3
33
C1
15k
Audio
SG
GND
R1
1.2k
1.2k
R2
V
CC
DC Ammeter
R6
19.2k
R5
19.2k
19.2k
R3
19.2k
R43
S16
R42
S17
R41
S18
R40
S19
10k
10k
100
100
Oscillo
-scope
Distortion
Analyzer
AC
Voltmeter
CCIR
1kHz BPF
DIN Audio
"A" WTG
DC
Voltmeter
Amp
GND
GND
OFF : 0dB
ON : 30dB
R44
50k
S26
0dB or 30dB
S28
S29
S30
S31
S32
S14
S15
S13
2.7k
R30
2.2
S7
4.7
V4
R45
180k
R16
5.1k
10n
C7
C1
1
10
A
S8
1
C12
R19
138.5k
GND
R4
S3
C3
R8
2.2k
R9
Power
Supply
2.2k
4.7
4.7
2.2k
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
--
10
--
CXA1980Q
Application Circuit
1k
R10
R9
10k
C18
C19
(H : G1, L : G2)
C17
R8
1MEG
R7
100k
L : SIGNAL EXIST
H : NO SIGNAL
C20
R11
22k
H : OFF,
L : DOLBY B
H : MSON, L : MSOFF
H : RVS, L : FWD
H : TAPE, L : AUX
V
DD
TO MICROCOMPUTER
0.1
C15
C13
2.2
C12
10
R3
1k
C1
16
C3
10n
R5
15k
C7
0.22
8V
C5
10
R6
18k
C14
2.2
C16
0.1
PB HEAD
C6
0.22
1k
R4
C4
10n
C2
16
0.1
1.5
0.015
22
FWD1
REV1
RVS2
FWD2
T
APESW
DRSW
NRSW
MSSW
MODESW
G1 (FF)
G2 (NOR)
MSTC
MSOUT
TC1
LINEOUT1
VCT
T
A
PEIN1
GND
PBOUT1
PBTC1
PBFB1
PBRIN1
PBFIN1
PBGND
E IREF
PBFIN2
PBRIN2
PBFB2
300k
300k
300k
300k
DET
MODE
MS
10dB
LPF
NR
DA
TAPE
1
2
3
4
5
6
7
8
17
18
19
20
21
22
23
24
9
10
11
12
13
14
15
16
25
26
27
28
29
30
31
32
MSGND
TC2
LINEOUT2
D IREF
TA
P
E
I
N
2
V
CC
PBOUT2
PBTC2
NR
NR
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 and other right due to same.
--11--
CXA1980Q
Description of Operation
(1) Signal route
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
Fig. 2
Op2
4dB
20dB
20dB
AUX
TAPE
Op1
PBFB PBTC
PBOUT
Dolby level
(30dBm)
TAPEIN
(6dBm)
LINEOUT
PBIN
F
R
NR
10
15
20
25
30
35
40
45
50
55
60
65
70
75
P
B
I
N
VR adjustment
30dBm
30dBm
6dBm
Dolby level
70dBm
5
P
B
O
U
T
T
A
P
E
I
N
L
I
N
E
O
U
T
0dBm
--12--
CXA1980Q
(3) Adjustment of playback equalizer
Fig. 3
1 Adjustment of EQ curve gain difference (= adjustment of internal variable R)
E IREF resistor
The internal variable resistor Ri should be adjusted to adjust the EQ curve gain differences (G1-G2),
(G1-G3). Therefore, adjust the external resistor R4 for E IREF pin.
2 AC gain adjustment
External resistor R1
The external resistor R1 should be adjusted to adjust the AC gain. G1 are obtained by the following
equations.
G1=20log
R1+300k
(dB)
R1
[AC gain can be also adjusted by attaching VR to PBOUT pin, fixing R1. However, the low-band cut-
off frequency can be more lowered by R1 adjustment method with the same C1 value used for this
method.]
3 Low-band cut-off frequency
External resistor R1 and external capacitor C1
The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external
capacitor C1.
1
R1
C2
C1
PBFB
3
2
PBTC
PBOUT
300k
E IREF
R4
1
G1
G2
G3
PBIN
F
R
Ri
3
2
fc
300k
Fig. 4
--13--
CXA1980Q
(4) MS (interval detection between tracks) adjustment method
Fig. 5
1
MS gain (G1/G2 mode gain) adjustment
External resistors R1, R2
MS gain is expressed by the following equations.
G1=10+20log
R1+100k
(dB)
G2=10+20log
R2+100k
(dB)
R1
R2
2
MS cut-off frequency adjustment
External resistors R1, R2 and external capacitors C1, C2
The external resistors R1, R2 and external capacitors C1, C2 should be adjusted to adjust the low-
band cut-off frequency of MS frequency characteristics.
DET
G2
G1
MSOUT
TAPEIN
NOR (BS)
FF (AMS)
10dB
25kHz LPF
100k
G1
G2
R1
R2
C1
C2
2
1
MSTC
2
1
2
1
2
1
--14--
CXA1980Q
Characteristics Graphs
Supply voltage [V]
7.0
8.0
9.0
10.0
11.0
12.0
11.5
12.0
12.5
C
u
r
r
ent
c
ons
um
pt
i
on [
m
A
]
Current consumption vs. Supply voltage
For no signal
NR OFF, MS OFF
50
100
1k
10k
Playback equalizer frequency characteristics
Ga
i
n
[d
B
]
Frequency [Hz]
60
50
40
30
OUT
300k
0.01
33
270
10
8
6
4
2
0
1k
100
10k
V
CC
=8.0V
0dB=Dolby Level
Decode boost frequency characteristics
D
e
c
ode boos
t
[
d
B
]
Frequency [Hz]
40dB
30dB
20dB
10dB
0dB
Ta=25C
Ta=25C
Ta=25C
V
CC
=8.0V
NR OFF, MS OFF
Output level 25dBm constant
120s
70s
--15--
CXA1980Q
24
20
16
12
8
4
0
10
0
10
1
Total harmonic distortion (pre-amplifier block)
Dis
t
o
r
t
io
n
[
%
]
Output level [dBm]
f=10kHz
f=1kHz
f=100Hz
6
2
2
6
10
14
10
-2
10
-1
10
0
Total harmonic distortion (Dolby block)
Dis
t
o
r
t
io
n
[
%
]
Output level [dBm]
Input : TAPEIN1
Output : LINEOUT1
V
CC
=8.0V
0dB=Dolby Level
NR ON
f=100Hz
NR OFF
f=1kHz
NR ON
f=10kHz
NR ON
f=1kHz
70
1k
100
10k
Ripple elimination ratio (PBOUT)
Rip
p
l
e
e
lilm
in
a
t
io
n
r
a
t
i
o
[
d
B
]
Frequency [Hz]
60
50
40
30
20
10
0
70
1k
100
10k
V
CC
=8.0V
Ripple elimination ratio (LINEOUT)
Rip
p
l
e
e
lilm
in
a
t
io
n
r
a
t
i
o
[
d
B
]
Frequency [Hz]
60
50
40
30
20
10
0
NR OFF
NR ON
Input : PBFIN1
Output : PBOUT1
V
CC
=8.0V
10
-1
Ta=25C
Ta=25C
Ta=25C
Ta=25C
V
CC
=8.0V
RL=2.7k
--16--
CXA1980Q
60
70
1k
100
10k
Cr
o
s
s
t
a
lk
[
d
B
]
Frequency [Hz]
20
50
40
30
20
V
CC
=8.0V
Input : PBFIN1
Output : LINEOUT1
60
10
1k
100
10k
Blank detection level frequency characteristics
I
nput
l
e
v
e
l
[
d
B
m
]
Frequency [Hz]
20
50
40
30
20
HPF gain 40dB
HPF gain 20dB
70
60
50
40
30
10
20
30
40
50
60
MS block gain vs. Blank detection level
I
nput
l
e
v
e
l
[
d
B
m
]
HPF gain [dB]
Ta=25C
Ta=25C
Ta=25C
Cross talk between channels (1ch 2ch)
V
CC
=8.0V
Ta=25C
Input : TAPEIN1
V
CC
=8.0V
Ta=25C
Input : TAPEIN1
f=1kHz
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS
EPOXY RESIN
SOLDER PLATING
42 / COPPER ALLOY
32PIN QFP (PLASTIC)
9.0
0.2
7.0 0.1
1.5 0.15
(8.0)
0.1 0.1
+ 0.2
+ 0.35
+ 0.3
0.50
0 to 10
0.8
b
1
8
9
32
16
17
24
25
M
0.24
0.2g
QFP-32P-L01
P-QFP32-7x7-0.8
0.1
b = 0.30 0.10
( 0.30)
(0.127)
+ 0.15
DETAIL A : SOLDER
A
0.127 0.05
+ 0.10
PACKAGE STRUCTURE
Package Outline Unit : mm
CXA1980Q
--17--
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS
EPOXY RESIN
SOLDER PLATING
42 / COPPER ALLOY
32PIN QFP (PLASTIC)
9.0
0.2
7.0 0.1
1.5 0.15
(8.0)
0.1 0.1
+ 0.2
+ 0.35
+ 0.3
0.50
0 to 10
0.8
b
1
8
9
32
16
17
24
25
M
0.24
0.2g
QFP-32P-L01
P-QFP32-7x7-0.8
0.1
b = 0.30 0.10
( 0.30)
(0.127)
+ 0.15
DETAIL A : SOLDER
A
0.127
0.05
+ 0.10
PACKAGE STRUCTURE
LEAD PLATING SPECIFICATIONS
ITEM
LEAD MATERIAL
42 ALLOY
SOLDER COMPOSITION
Sn-Bi Bi:1-4wt%
PLATING THICKNESS
5-18
m
SPEC.
Sony Corporation
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