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PDF AN7354 Data sheet ( Hoja de datos )
| Número de pieza | AN7354 | |
| Descripción | Dolby B/C-type Noise Reduction | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN7354 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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ICs for Cassette, Cassette Deck
AN7354SC
Dolby* B/C-type Noise Reduction
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.
s Block Diagram
Unit : mm
1 42
21 22
0.3
9.5±0.3
11.5±0.3
42-Lead SSOP Package (SSOP042-P-0450)
REC.
VCC IN
PB
IN
1µF
+
42 41
1µF
+
40 39
5.6kΩ
1500pF
MPX
2.4kΩ
38 37 36
REC.
/PB
35
MPX METER
OFF/ 0dB
ON /20dB
0.1µF
+
2.2µF
+
1µF
+
34 33 32 31 30 29
LINE
OUT
100kΩ
28
LEVEL
METER
OUT
1500pF
+
27 26 25
1500pF
REC. OUT
+
24 23 22
Delay
Bias
Delay
LOGIC
Mute
Rect
Rect
Mute
SS HLS
SS HLS
LLS
LLS
1234
+
1µF
+
1µF
22kΩ
VEE REC.
IN
PB
IN
5
1500pF
67
2.4kΩ
MPX
5.6kΩ
89
NR C/B
ON/ -type
OFF
10 11 12 13 14 15 16 17
+
Mute
ON/OFF
+
0.1µF 1µF
+
2.2µF
100kΩ
LINE
OUT
1500pF
LEVEL
METER
OUT
18 19
+
20 21
+
1500pF
REC. OUT
1 page  
ICs for Cassette, Cassette Deck
s Characteristics Curve
Consumption Current
32
30
Encode Mode
Ta= 25˚C
28
C type Vin = 0
OFF 10kHz + 10dB
B type Vin = 0
26
24 C type 10kHz + 10dB
22 B type 10kHz + 10dB
20
18
16
14
12
±4.5
±5.0 ±5.5 ±6.0
±6.5
Supply Voltage VCC (V)
B – type Encode Characteristics
Ta= –30˚C
10 Ta= 25˚C
Ta= 80˚C
8 VCC=12V
–40dB
–30dB
6
4
2
0
100 200
–20dB
500 1k 2k
Frequency (Hz)
–10dB
0dB
5k 10k 20k
NR OFF Total Harmonics Distortion
5.0 Encode Mode
2.0 VCC = ± 6V
100Hz
1.0 1kHz
10kHz
0.5
0.2
0.1
0.05
0.02
0.01
–30
–20 –10
0
10
Output Level (dB)
20
C – type Total Harmonics Distortion
5.0 Encode Mode
2.0 VCC = ± 6V
1.0
0.5
0.2
0.1
0.05
0.02
0.01
–30
100Hz
1kHz
10kHz
–20 –10
0
10
Output Level (dB)
20
AN7354SC
Consumption Current
32
30
Decode Mode
Ta= 25˚C
28
26
C type 10kHz + 10dB
24
22
B type 10kHz + 10dB
20
18
16
14
12
±4.5
C type Vin = 0
OFF 10kHz + 10dB
B type Vin = 0
±5.0 ±5.5 ±6.0 ±6.5
Supply Voltage VCC (V)
C – type Encode Characteristics
20 –60dB
16 –50dB
12 –40dB
8
–30dB
4 –20dB
0
Ta = –30˚C
–4
Ta = 25˚C
Ta = 80˚C
VCC =12V
100 200 500
1k
2k
Frequency (Hz)
–10dB
0dB
5k 10k 20k
B – type Total Harmonics Distortion
5.0 Encode Mode
2.0 VCC = ± 6V
100Hz
1.0 1kHz
10kHz
0.5
0.2
0.1
0.05
0.02
0.01
–30 –20 –10
0
10
Output Level (dB)
20
Signal Handling
26
Encode Mode
24 f=1kHz
22 THD=1%
20
18
16
14
12
NR OFF
10 B type
8 C type
6
±4.5
±5.0 ±5.5 ±6.0
Supply Voltage VCC (V)
±6.5
5 Page 
ICs for Cassette, Cassette Deck
s Pin Description (Cont.)
Pin No. Pin Name
Input Impedance
Pin Voltage
Pin Description
17
26
VCR H
Neutral GND
HLS
side chain
control resistor pin
18
25
RECT H
–5.45V
HLS control signal
smoothing pin
19
24
VCR L
Neutral GND
LLS
side chain
control resistor pin
20
23
RECT–L
–5.45V
LLS control signal
smoothing pin
21
22
REC. OUT
56Ω
neutral GND
Record output pin
AN7354SC
Equivalent Circuit
VCC
30Ω
31Ω
–VCC
VCC
30Ω
–VCC
VCC
30Ω
–VCC
VCC
56Ω
–VCC
VCC
–VCC
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AN7354.PDF ] | |
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