U4275B Datasheet | TEMIC Semiconductors

TELEFUNKEN Semiconductors 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 mon channel interferences D Evaluation of the receiving conditions by microputer D D D D D Interrupt output for abruptly occuring interferences Suitable for analogue as well as digital processing Mute function controllable by microputer Multipath noise cancellation Only a few external ponents necessary Block diagram FIL19 20 CRIN 14 Oscillator mon channel detector Filter Interference interrupt 9 INT FIL26 19 CCHFIL 17 12 Reset Address logic 1 FSIN AVFS 3 Multipath detector Analogue multiplex 11 13 15 ADDR0 ADDR1 OE ANAOUT 2 BFSOUT Buffer MNC control Multipath Noise Cancellation (Gain 1.5) 18 4 5 6 8 Bandgap 94 8644 16 GND1 MUTE MPFIL GND2 VREF MPXIN MPXOUT Rev. A1: 14.03.1995 Preliminary Information 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 multiplexer Address 1 for analogue multiplexer Ceramic resonator input (456 k Hz) Output enable for ANAOUT Ground Filter for mon channel detection Filter for multipath detection Filter for 26 k Hz detection Filter for 19 k Hz-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...