U4275B Datasheet, PDF (2/12 Pages) TEMIC Semiconductors – FM-Receiving Condition Analyser and Multipath Noise Cancellation

U4275B
Pin description
Pin Symbol
Function
1
FSIN Fieldstrength input
2 BFSOUT Buffered fieldstrength output
3 AVFS Average of fieldstrength signal
4 MPXIN Multiplex input signal
5 GND2 Analogue ground
6 MPXOUT Multiplex output signal
7
VS Supply voltage
8 VREF Reference voltage
9
INT Interrupt output
10 MUTE External mute input
11 ANAOUT Analogue multiplex output
12 ADDR0 Address 0 for analogue multi-
plexer
13 ADDR1 Address 1 for analogue multi-
plexer
14 CRIN Ceramic resonator input
(456 kHz)
15
OE Output enable for ANAOUT
16 GND1 Ground
17 CCFIL Filter for common channel
detection
18 MPFIL Filter for multipath detection
19 FIL26 Filter for 26 kHz detection
20 FIL19 Filter for 19 kHz-Pilot detection
TELEFUNKEN Semiconductors
FSIN ¹
BFSOUT ²
AVFS ³
MPXIN ⁴
GND2 5
MPXOUT ⁶
VS ⁷
VREF ⁸
INT ⁹
MUTE 10
20 _FIL19
19 FIL26
18 _MPFIL
17 _CCFIL
16 _GND1
15 _OE
14 _CRIN
13 _ADDR1
12 _ADDR0
11 _ANAOUT
94 8830
FSIN / BFSOUT
AVFS
V_S
FSIN
40 mA
BFSOUT
AVFS
40 mA
94 8647
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.
94 8648
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