U4454B
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
VCO Tank Loop filter
93 7653
12 Lock detector 16 IF Input 1 Video
90° 0° Interference rejection
Output
Overload detector 14 3 NC +/- Lock detector AGC
+V
2 NC
5 IF AGC
7 Average
Figure 1.
TELEFUNKEN Semiconductors Rev. A1, 23-Feb-96
1 (7)
Preliminary Information
Pin Description
IFin NC NC...
