U4275B
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
FSIN
BFSOUT
AVFS
MPXIN
GND2
MPXOUT
VS
VREF
INT
MUTE
ANAOUT
ADDR0
ADDR1
CRIN
OE
GND1
CCFIL
MPFIL
FIL26
FIL19
Function
Fieldstrength input
Buffered fieldstrength output
Average of fieldstrength signal
Multiplex input signal
Analogue ground
Multiplex output signal
Supply voltage
Reference voltage
Interrupt output
External mute input
Analogue multiplex output
Address 0 for analogue multi-
plexer
Address 1 for analogue multi-
plexer
Ceramic resonator input
(456 kHz)
Output enable for ANAOUT
Ground
Filter for common channel
detection
Filter for multipath detection
Filter for 26 kHz detection
Filter for 19 kHz-Pilot detection
TELEFUNKEN Semiconductors
FSIN 1
BFSOUT 2
AVFS 3
MPXIN 4
GND2 5
MPXOUT 6
VS
7
20 FIL19
19 FIL26
18 MPFIL
17 CCFIL
16 GND1
15 OE
14 CRIN
13 ADDR1
12 ADDR0
11 ANAOUT
94 8830
VREF 8
INT
9
MUTE 10
FSIN / BFSOUT
V
S
40
m
A
FSIN
94 8647
AVFS
BFSOUT
AVFS
40
m
A
94 8648
All information about reception conditions is derived
from the fieldstrength voltage. The fieldstrength voltage
at FSIN is initially buffered so as not to impair the
characteristics of the IF IC and is available at BFSOUT.
The fieldstrength signal at buffer output BFSOUT is
averaged over time and applied to input AVFS via an RC
low-pass filter with a large time constant.
2
Preliminary Information
Rev. A1: 14.03.1995
TEMIC [ TEMIC SEMICONDUCTORS ]
