ICs for Cassette, Cassette Deck
s
Overview
The AN7354SC is an IC for 2 ch. Dolby B/C-Type noise
reduction process. It requires fewer external parts and
incorporates the functions of line-output muting and level
detection and the delay circuit.
s
Features
·
Built-in spectral skewing circuit not requiring external
parts
·
Line-output muting circuit built-in
·
PB input delay circuit built-in
·
Built-in level detection circuit for automatic level adjust-
ment and level meter
·
ON/OFF of NR, B-/C-type, REC./PB, MPX and muting
function, and Hi/Lo changeover of level detection gain,
directly-controllable by microcomputer
*
Dolby symbols are the trademarks of Dolby Laboratory
Licensing Corporation. The use of this products
requires the approval of Dolby Laboratories Licensing
Corporation in advance.
AN7354SC
Dolby
*
B/C-type Noise Reduction
0.45
0.35
±
0.1
1.0
0.1
±
0.1
0.3
2.0
±
0.2
0.9
0.15
1
9.5
±
0.3
11.5
±
0.3
Unit : mm
21.25
±
0.3
42
21
22
42-Lead SSOP Package (SSOP042-P-0450)
s
Block Diagram
V
CC
REC.
IN
Bias
LOGIC
REC.
/PB
MPX
OFF/
ON
LINE
OUT
LEVEL
METER
OUT
REC. OUT
METER
0dB
/20dB
PB
IN
1500pF
5.6k
1
µ
F
1
µ
F
100k
1500pF
1500pF
2.4k
42
22
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
1
21
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
+
+
+
+
+
+
+
+
+
+
+
+
+
+
2.2
µ
F
0.1
µ
F
1
µ
F
0.47
µ
F
0.47
µ
F
V
EE
REC.
IN
NR
ON/
OFF
C/B
-type
LINE
OUT
LEVEL
METER
OUT
REC. OUT
Mute
ON/OFF
PB
IN
1500pF
5.6k
2.4k
22k
100k
1500pF
1500pF
2.2
µ
F
0.1
µ
F
1
µ
F
1
µ
F
1
µ
F
0.47
µ
F
0.47
µ
F
Delay
Delay
Mute
HLS
HLS
LLS
LLS
Rect
Rect
MPX
MPX
SS
SS
Mute
ICs for Cassette, Cassette Deck
AN7354SC
s
Absolute Maximum Ratings
(Ta=25°C)
V
CC
I
CC
(+)
I
CC
()
P
D
T
opr
T
stg
Supply Voltage
Supply Current (Ta=75°C)
Power Dissipation (Ta=75°C)
Operating Ambient Temperature
Storage Temperature
V
mA
mW
°C
°C
Parameter
Symbol
Rating
Unit
±
6.7
+22
22
295
20 ~ + 75
55 ~ + 125
Parameter
Symbol
Range
s
Recommended Operating Range
(Ta=25°C)
Operating Supply Voltage Range
V
CC
±
4.5V ~
±
6.5V
s
Electrical Characteristics
(V
CC
=
±
6V, Ta=25°C
±
2°C)
Parameter
Symbol
Condition
min.
typ.
max.
Unit
Total Circuit Current
Note 1)
12
I
CC
20
mA
16
REC., OFF, No input signals
G
rin
17
19
21
dB
REC., OFF, f = 1kHz
REC. OUT Level 388mV
REC. IN to REC. OUT
I/O Gain
Note 2)
G
pin
22
24
26
dB
PB, OFF, f = 1kHz
REC. OUT Level 388mV
PB IN to REC. OUT
I/O Gain
Note 3)
DG
mpx
1
0
1
dB
PB, OFF, f = 1kHz
Gain difference from Gpin
MPX ON/OFF Gain Difference
V
lout
510
570
640 mVrms
PB, OFF, f = 1kHz
V
in
= 0dB
LINE OUT Level
BR 1
9.4
10.4
11.9
dB
REC., B, f = 10kHz
V
in
= 40dB
B-type Encode Boost (1)
BR 2
6.7
8.2
9.7
dB
REC., B, f = 5kHz
V
in
= 30dB
B-type Encode Boost (2)
BR 3
4.2
5.7
7.2
dB
REC., B, f = 1kHz
V
in
= 25dB
B-type Encode Boost (3)
BR 4
1.1
0.4
1.9
dB
REC., B, f = 10kHz
V
in
= 0dB
B-type Encode Boost (4)
CR 1
18.1
19.6
21.6
dB
REC., C, f = 1kHz
V
in
= 60dB
C-type Encode Boost (1)
CR 2
11.5
13.5
15.5
dB
REC., C, f = 5kHz
V
in
= 40dB
C-type Encode Boost (2)
CR 3
8.7
10.7
12.7
dB
REC., C, f = 300Hz
V
in
= 30dB
C-type Encode Boost (3)
CR 4
3.5
5.5
7.5
dB
REC., C, f = 5kHz
V
in
= 25dB
C-type Encode Boost (4)
CR 5
8.3
6.3
4.3
dB
REC., C, f = 15kHz
V
in
= 0dB
C-type Encode Boost (5)
V
Omax.
12
13
dB
REC., OFF, f = 1kHz
V
CC
=
±
4.5V THD = 1%
Signal Handling
THDO
0.02
0.15
%
REC., OFF, f = 1kHz
V
in
= 0dB
Total Harmonics Distortion off
THDC
0.13
0.3
%
REC., C, f = 1kHz
V
in
= 0dB
Total Harmonics Distortion C
S/N
60.0
62.5
dB
REC., C, R
g
= 5.1k
CCIR/ARM Weighted
Signal to Noise Ratio
Vofs R
70
0
70
mV
REC., OFF,
C switch,
REC. OUT potential fluctuation
Mode Switch Offset
Note 1) REC., OFF in the condition description, expresses that MODE is REC. and NR is OFF. The same for the following.
Note 2) Obtain the input voltage of REC. IN when the output voltage of REC. OUT becomes 388mVrms. For this input
voltage, the reference level in REC. is assumed 0dB.
Note 3) Obtain the input voltage of PB. IN when the output voltage of REC. OUT becomes 388mVrms. For this input voltage,
the reference level in PB is assumed 0dB.
ICs for Cassette, Cassette Deck
AN7354SC
Parameter
Symbol
Condition
min.
typ.
max.
Unit
VPS (1)
2
3
4
V
Delay Output (1)
V
in
= 0.2V
S30
C PB MPX off
Piny and Pin#7 DC Potential
VPS (2)
4
6
8
V
Delay Output (2)
V
in
= + 0.2V
S30
C PB MPX off
Difference from VPS (1)
VPS (3)
0.1
0
0.1
V
Delay Output (3)
V
in
= 0.2V
S30
B PB MPX off
Piny and Pin#7 DC Potential
VPS (4)
0.2
0
0.2
V
Delay Output (4)
V
in
= + 0.2V
S30
B PB MPX off
Difference from VPS (3)
VPS (5)
4
3
2
V
Delay Output (5)
V
in
= 0.2V
S30
A PB MPX off
Piny and Pin#7 DC Potential
VPS (6)
4
6
8
V
Delay Output (6)
V
in
= + 0.2V
S30
A PB MPX off
Difference from VPS (5)
CB
1
0
1
dB
Gain difference between
channels, Grin and Gpin
Channel Balance
THDP
0.02
0.15
%
PB, OFF, f = 1kHz
V
in
= 0dB, LINE OUT
Total Harmonics Distortion Line Out
G
mut
85
75
dB
PB, OFF, Mute ON
f = 1kHz, V
in
= 0dB
Line Mute Attenuation
Vofs M
20
0
20
mV
Mute OFF
ON switching,
LINE OUT potential fluctuation
Line Mute Offset
VDC (1)
0.9
1.0
1.1
V
PB, OFF, LMG Normal
f = 1kHz, V
in
= 3dB
Level Meter Output (1)
Note 4)
VDC (2)
3.6
4.0
4.4
V
PB, OFF, LMG Normal
f = 1kHz, V
in
= +9dB
Level Meter Output (2)
VDC (3)
0.9
1.0
1.1
V
PB, OFF, LMG High
f = 1kHz, V
in
= 18dB
Level Meter Output (3)
Vofs L
15
0
15
mV
PB, OFF, LMG Normal
No Input
Level Meter Output Offset
Note 4) LMG in the condition description is an abbreviation of Level Meter Gain.
s
Electrical Characteristics (Cont.)
(V
CC
=
±
6V, Ta=25°C
±
2°C)
ICs for Cassette, Cassette Deck
AN7354SC
Parameter
Symbol
Condition
min.
typ.
max.
Unit
s
Electrical Characteristics
(Ta=25°C
±
2°C) [Design Reference Values]
The following characteristic values are reference values for design but not guaranteed values.
REC. IN Input Resistance
56.4
Rin RI
75.6
k
64
PB IN Input Resistance
28.05
Rin PI
37.95
k
33
V
mut (1)
4.4
6.4
8.4
V
Decreased Voltage Mute (1)
PB, OFF, Mute OFF, f=1kHz,
V
in
= 0dB Voltage between
Pins1 and 42 when mute functions
CT RP
80
70
dB
PB, OFF, f
= 1kHz
V
in
= 0dB (At REC)
Crosstalk,
REC. IN to LINE OUT
CT CC
80
70
dB
PB, OFF, f
= 1kHz
V
in
= 0dB
Crosstalk, Cannel to Cannel
V
C
PB
+2.5
+6
V
Pin35 applied DC voltage when
PB, MPX are OFF
PB/REC. Control Voltage PB
V
C
REC.
1.5
+1.5
V
PB/REC. Control Voltage REC.
Pin35 applied DC voltage when
PB, MPX are ON
V
C
Mon
1.5
+1.5
V
MPX Control Voltage ON
Pin34 applied DC voltage when
PB, MPX are ON
V
C
Moff
+2.5
+6
V
MPX Control Voltage OFF
Pin34 applied DC voltage when
PB, MPX are OFF
V
C
Mnor
+2.5
+6
V
Meter Control Voltage Normal
Pin33 applied DC voltage when
Meter becomes Normal
V
C
Mhi
1.5
+1.5
V
Meter Control Voltage Hi
Pin33 applied DC voltage when
Meter becomes Hi
V
C
ON
+2.5
+6
V
NR Control Voltage ON
Pin8 applied DC voltage when
NR is ON
V
C
OFF
1.5
+1.5
V
NR Control Voltage OFF
Pin8 applied DC voltage when
NR is OFF
V
C
C
+2.5
+6
V
B/C Control Voltage C
Pin9 applied DC voltage for
C-type NR
V
C
B
1.5
+1.5
V
B/C Control Voltage B
Pin9 applied DC voltage for
B-type NR
V
C
MUon
+2.5
+6
V
Mute Control Voltage ON
Pin10 applied DC voltage when
Mute is ON
V
C
MUof
1.5
+1.5
V
Mute Control Voltage OFF
Pin10 applied DC voltage when
Mute is OFF
CT PR
80
70
dB
PB, OFF, f
= 1kHz
V
in
= 0dB (At PB)
Crosstalk,
PB IN to REC. OUT
ICs for Cassette, Cassette Deck
AN7354SC
32
30
28
26
24
22
20
18
16
14
12
Supply Voltage V
CC
(V)
C
o
n
s
u
m
p
t
i
o
n
C
u
r
r
e
n
t
(
m
A
)
±
6.5
±
4.5
Consumption Current
±
5.0
±
5.5
±
6.0
±
6.5
±
4.5
±
5.0
±
5.5
±
6.0
Encode Mode
Ta= 25°C
C type V
in
= 0
OFF 10kHz + 10dB
B type V
in
= 0
32
30
28
26
24
22
20
18
16
14
12
Supply Voltage V
CC
(V)
C
o
n
s
u
m
p
t
i
o
n
C
u
r
r
e
n
t
(
m
A
)
Consumption Current
Decode Mode
Ta= 25°C
20
16
12
8
4
0
4
Frequency (Hz)
E
n
c
o
d
e
b
o
o
s
t
(
d
B
)
100
C type Encode Characteristics
500
200
1k
2k
10k
5k
20k
Ta = 30°C
Ta = 25°C
Ta = 80°C
V
CC
=12V
10
8
6
4
2
0
Frequency (Hz)
E
n
c
o
d
e
b
o
o
s
t
(
d
B
)
100
B type Encode Characteristics
500
200
1k
2k
10k
5k
20k
5.0
Output Level (dB)
T
o
t
a
l
H
a
r
m
o
n
i
c
s
D
i
s
t
o
r
t
i
o
n
(
%
)
20
30
NR OFF Total Harmonics Distortion
10
0
10
20
2.0
1.0
0.5
0.2
0.1
0.05
0.02
0.01
100Hz
1kHz
10kHz
5.0
Output Level (dB)
T
o
t
a
l
H
a
r
m
o
n
i
c
s
D
i
s
t
o
r
t
i
o
n
(
%
)
20
30
B type Total Harmonics Distortion
10
0
10
20
2.0
1.0
0.5
0.2
0.1
0.05
0.02
0.01
C type 10kHz + 10dB
B type 10kHz + 10dB
C type 10kHz + 10dB
B type 10kHz + 10dB
Ta= 30°C
Ta= 25°C
Ta= 80°C
V
CC
=12V
Encode Mode
V
CC
=
±
6V
100Hz
1kHz
10kHz
Encode Mode
V
CC
=
±
6V
s
Characteristics Curve
40dB
30dB
20dB
10dB
0dB
60dB
50dB
40dB
30dB
20dB
10dB
0dB
26
24
22
20
18
16
14
12
10
8
6
Supply Voltage V
CC
(V)
S
i
g
n
a
l
H
a
n
d
l
i
n
g
(
d
B
)
±
6.5
±
4.5
Signal Handling
±
5.0
±
5.5
±
6.0
5.0
Output Level (dB)
T
o
t
a
l
H
a
r
m
o
n
i
c
s
D
i
s
t
o
r
t
i
o
n
(
%
)
20
30
C type Total Harmonics Distortion
10
0
10
20
Encode Mode
V
CC
=
±
6V
2.0
1.0
0.5
0.2
0.1
0.05
0.02
0.01
100Hz
1kHz
10kHz
Encode Mode
f=1kHz
THD=1%
NR OFF
B type
C type
C type V
in
= 0
OFF 10kHz + 10dB
B type V
in
= 0
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