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U4275B Datasheet, PDF (1/12 Pages) TEMIC Semiconductors – FM-Receiving Condition Analyser and Multipath Noise Cancellation
TELEFUNKEN Semiconductors
U4275B
FM-Receiving Condition Analyser and Multipath Noise
Cancellation
Description
The U4275B is a bipolar integrated receiving conditions
analyser as well as multipath noise cancellation circuit.
It is designed for high performance car radio applications.
Features
D Preparation of the fieldstrength signal
D Detection of multipath and common channel
interferences
D Evaluation of the receiving conditions by
microcomputer
D Interrupt output for abruptly occuring interferences
D Suitable for analogue as well as digital processing
D Mute function controllable by microcomputer
D Multipath noise cancellation
D Only a few external components necessary
Block diagram
14
CRIN
Oscillator
FIL19 FIL26 CCHFIL
20
19 17
Common
channel
detector
Filter
1
FSIN
3
AVFS
Multipath
detector
Interference
interrupt
9
INT
Reset
Analogue
multiplex
Address
logic
12
ADDR0
13
ADDR1
15 OE
11
ANAOUT
2
BFSOUT
Buffer
94 8644
MNC
control
10 18
MUTE MPFIL
Multipath
Noise
Cancellation
(Gain 1.5)
7
Bandgap VS
4 568
16
GND2 VREF GND1
MPXIN MPXOUT
Rev. A1: 14.03.1995
Preliminary Information
1