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PDF U4275B Data sheet ( Hoja de datos )
| Número de pieza | U4275B | |
| Descripción | FM-Receiving Condition Analyser and Multipath Noise Cancellation | |
| Fabricantes | TEMIC Semiconductors | |
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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
FSIN
AVFS
1
3
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
1 page  
TELEFUNKEN Semiconductors
ADDR0 / ADDR1 / OE
U4275B
20 mA
20 mA
20 mA
ADDR0
94 8659
ADDR1
94 8660
OE
94 8662
The desired output variable at ANAOUT is selected via the address lines ADDR0 and ADDR1 and switched to the
output via the enable input OE. The following assignment applies:
No OE ADDR1 ADDR0
ANAOUT
0 L L L Internal reference voltage
Additional reset of the analog voltages for signal level, multipath,
common channel
1 L L H Signal level
2 L H L Multipath
3 L H H Common channel
4 H X X High impedance off-state
Rev. A1: 14.03.1995
Preliminary Information
5
5 Page 
TELEFUNKEN Semiconductors
Extended type number
U4275B-AFL
U4275B-AFLG3
Package
SO 20 plastic
SO 20 plastic
Dimensions in mm
U4275B
Remarks
Taping according to IEC-286-3
Rev. A1: 14.03.1995
Preliminary Information
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet U4275B.PDF ] | |
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| U4275B | FM-Receiving Condition Analyser and Multipath Noise Cancellation | TEMIC Semiconductors |
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