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| 型號(hào)： | U4454B |
| 英文描述： | Quasi-Split-Sound Processing and AM-Demodulator |
| 中文描述： | 準(zhǔn)裂聲音處理和AM -解調(diào)器 |
| 文件頁(yè)數(shù)： | 1/7頁(yè) |
| 文件大?。?/td> | 107K |
| 代理商： | U4454B |
U4454B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 23-Feb-96
1 (7)
Quasi-Split-Sound Processing and AM-Demodulator
Description
The U4454B quasi-split-sound processor is a bipolar
integrated circuit for all FM-TV standards and NICAM
sound systems. For FM/NICAM the IC operates as
QSS-mixer. In case of AM sound the circuit can be used
as AM demodulator.
Features
PLL intercarrier-mixer for all FM standards
(incl. NICAM sound system)
High grade signal processing for FM/NICAM
sound systems
Also suitable as AM-demodulator
Gain controlled wideband amplifier
AGC operates as a peak- and mean-level detector
High input sensitivity
Wide supply voltage range (6.8 V up to 13 V)
Low power consumption
ESD protection
Case:
16-pin DIL plastic
Block Diagram
Lock
detector
90
°
8
9
VCO
11
Video
Overload
detector
Lock
detector
16
1
IF Input
12
14
6
Output
Interference
rejection
13
Average
7
10
4
15
IF AGC
5
2
NC
3
Loop filter
VCO Tank
+V
S
AGC
+/–
93 7653
0
°
NC
Figure 1.
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