U4454B Datasheet, PDF (1/7 Pages) TEMIC Semiconductors – Quasi-Split-Sound Processing and AM-Demodulator

U4454B
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
D PLL intercarrier-mixer for all FM standards
(incl. NICAM sound system)
D High grade signal processing for FM/NICAM
sound systems
D Also suitable as AM-demodulator
D Gain controlled wideband amplifier
D AGC operates as a peak- and mean-level detector
D High input sensitivity
D Wide supply voltage range (6.8 V up to 13 V)
D Low power consumption
D ESD protection
Case: 16-pin DIL plastic
Block Diagram
Loop filter
VCO Tank
12
Lock
detector
16
IF Input
1
Video
11 8
9
VCO
90°
0°
93 7653
6
Output
Interference
rejection
3
NC
2
NC
Overload
detector
5
IF AGC
+/–
4
15 10
AGC
Lock
detector
7
13
Average
Figure 1.
14 _+V
S
TELEFUNKEN Semiconductors
1 (7)
Rev. A1, 23-Feb-96
Preliminary Information