AN7354SC Datasheet, PDF (1/12 Pages) Panasonic Semiconductor – Dolby B/C-type Noise Reduction

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.
PB
VCC IN
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
LLS
SS
HLS
LLS
1
2
3
4
+
1µF
+
1µF
22kΩ
VEE REC.
PB
IN
IN
5
1500pF
6
7
2.4kΩ
MPX
5.6kΩ
8
9
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