ICs for Cassette, Cassette Deck
AN7379NSH
Dolby* B-type Noise Reduction Decoder for 1.5V Headphone Stereo
s
Overview
The AN7379NSH is an IC for Dolby B-type noise reduc-
tion playback suitable for 1.5V headphone stereo and
incorporates multi-purpose buffer amp., GND switch and
stand-by function in a single chip.
1
24
0.5
Unit : mm
M
ain
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s
Features
•
Operating voltage range : V
CC
=1.0 to 3.6V
Head room (Dolby Level +12dB) is guaranteed to 1.1V.
•
Low consumption current : 1 total =3.6mA
•
Small number of parts
•
Buffer amplifier with switches, GND switch pin
•
Stand-by switches greatly saving the consumption cur-
rent
•
Small package : 0.5mm pitch 24-lead SOP type
12
0.1±0.1
(0.5)
5.5±0.3
7.5±0.3
*
“Dolby” and double D symbols are trademarks of Dolby
Laboratories Licensing Corporation. The use of this
product requires the approval of Dolby Laboratories
Licensing Corporation in advance.
s
Block Diagram
V
CC
In
+
2kΩ
1µF
ue
6800pF
15kΩ
5.6kΩ
8200pF
isc
on
24
23
22
21
100Ω
/D
Zin
=
22kΩ
Ma
int
en
an
I
REF
ce
27kΩ
100kΩ
V
REF
Zin
=
22kΩ
27kΩ
1
1µF
+
100Ω
2
+
0.33µF
8200pF
V
REF
180kΩ
GND
In
OP
+
22µF
TP
NR
ON/OFF
1µF
+
+
6800pF
390kΩ
+
2kΩ
2.2kΩ
1µF 15kΩ
3
4
Pl
100kΩ
0.015µF
0.15µF
0.012µF
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0.65±0.1
24-Lead SSOP Package (SSOP024-P-0300)
OP
TP
GND SW
ON/OFF
Buffer
ON/OFF
0.012µF
0.15µF
2.2kΩ
20
19
18
17
16
0.33µF
+
+
13
0.2±0.1
di
390kΩ
1µF
ON
+
(LPF)
(BEF)
ON
OFF
OFF
13
tin
15
14
110kΩ
Logic
110kΩ
5
6
7
8
9
10
11
12
OFF
ON
ON OFF
Standby
ON/OFF
0.15
– 0.05
0.65±0.1
+ 0.1
1.5±0.2
6.5±0.3
ICs for Cassette, Cassette Deck
AN7379NSH
s
Electrical Characteristics
(Ta=25˚C, V
CC
= 1.2V, Dolby Reference Level ; 24.5mVrms (–30dBm) at TP)
Parameter
Standby OFF
Total Circuit
Current
Standby OFF
Standby ON
Standard Input Level
Note 1)
Channel Balance
Symbol
I
CC1
I
CC2
I
CC3
V
in
CB
Condition
NR
OFF
ON
OFF
OFF
OFF
ON
LPF
OFF
OFF
OFF
OFF
OFF
BPF f Hz
OFF
OFF
ON
OFF
OFF
1k
1k
Others
No signals
No signals
No signals
V
O
= 24.5mVrms
Channel Ratio
V
in
= –29.6dB
Theoretical NRD
= V
O
+40dB
V
in
= –23.9dB
Theoretical NRD
= V
O
+30dB
V
in
= –15.8dB
Theoretical NRD
= V
O
+20dB
V
in
= –17.4dB
Theoretical NRD
= V
O
+20dB
V
in
= 0.4dB
Theoretical NRD
= V
O
dB
V
in
= +10dB
V
in
= +10dB
20
–1
min.
2.8
2.8
typ.
3.8
3.9
0
23
0
0
max.
5.0
5.1
0.5
–1
2
Unit
mA
mA
mA
dB
dB
26 mVrms
M
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(1) NRD1
OFF
OFF
10k
–2
(2) NRD2
ON
OFF
OFF
1k
–2
NR–Decode
Characteristics
Note 2)
(3) NRD3
ON
OFF
OFF
1k
–2.5
(4) NRD4
ON
OFF
OFF
10k
–2.5
(5) NRD5
(1) THD1
(2) THD2
(3) THD3
S/N
G
V1
G
V2
G
V3
ON
OFF
ON
OFF
ON
10k
1k
1k
1k
–2
Total Harmonics
Distortion
Note 3)
OFF
ON
ON
ON
OFF
OFF
Signal Handling
Note 3)
OFF
OFF
S/N Ratio
Note 4)
OFF
OFF
V
in
= +12dB
R
g
= 5.6kΩ
CCIR/ARM –
Filter
V
in
= 0dB
V
in
= 0dB
V
in
= 0dB
V
in
= 0dB
70
(1)
(2)
(3)
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
ON
ON
1k
–1.5
–20
Filter Characteristics
Note 5)
1k
–8
5.5k V
in
= 0dB
1k
1k
Ma
int
en
an
ce
Note 1) Adjust input level for output level equal to 24.5mVrms, and set the reference input level to 0dB.
Note 2) Output level as compared with Standard 0dB = 24.5mVrms..Measurement point : TP
Note 3) Measurement point : OP
Note 4) Measurement point : TP
Note 5) Measurement point as compared with 24.5mVrms : Output level at OP
/D
isc
on
tin
NR : ON
CT1
ue
Channel
Crosstalk
NR : OFF
CT1
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0
2.5
0
2.5
0
2
0.2
0.3
0.3
0.5
1.0
%
%
%
0.8
72
– 0.5
– 6.5
–17
0.5
–5
dB
dB
dB
–12
OFF
OFF
50
dB
OFF
OFF
50
dB
0
2
dB
dB
dB
dB
dB
di
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semiconductors described in this book
(1)
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Consult our sales staff in advance for information on the following applications:
–
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–
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M
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Di
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