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U4276B

TEMIC Semiconductors
Part Number U4276B
Manufacturer TEMIC Semiconductors
Description FM Multipath Noise Cancellation
Published Oct 9, 2007
Detailed Description www.DataSheet4U.com U4276B FM Multipath Noise Cancellation Description The U4276B is a bipolar integrated multipath noi...
Datasheet PDF File U4276B PDF File

U4276B
U4276B

Overview
www.
DataSheet4U.
com U4276B FM Multipath Noise Cancellation Description The U4276B is a bipolar integrated multipath noise cancellation circuit.
It is designed for high performance car radio applications.
Features D Preparation of the fieldstrength signal D Multipath noise cancellation D Mute function controllable by microcomputer D Suitable for analogue as well as digital processing D Only a few external components necessary Block Diagram BFSOUT 7 2 FSIN Buffer Bandgap VS 6 3 GND 1 AVFS 4 MPXIN Multipath detection Multipath noise cancellation 8 5 MPXOUT 95 10619 MUTE Pin Description Pin 1 2 3 4 5 6 7 8 Symbol AVFS FSIN GND MPXIN MPXOUT VS BFSOUT MUTE Function Average of fieldstrength signal Fieldstrength input Ground Multiplex input signal Multiplex output signal Supply voltage Buffered fieldstrength output External mute input AVFS 1 FSIN 2 GND 3 MPXIN 4 95 10632 8 MUTE 7 BFSOUT 6 VS 5 MPXOUT TELEFUNKEN Semiconductors Rev.
A1, 05-Sep-96 1 (8) Preliminary Information U4276B FSIN / BFSOUT VS 40 m A FSIN 94 8647 MPXIN / MPXOUT VS 50 kW MPXIN BFSOUT 50 kW 94 8649 All information about reception conditions is derived from the fieldstrength signal.
The fieldstrength signal at FSIN is initially buffered so as not to impair the characteristics of the IF IC and is available at BFSOUT.
VS 60 kW VS AVFS MPXOUT 60 kW 200 m A 40 m A 94 8650 AVFS 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.
The MPX signal is fed directly from the FM demodulator to input MPXIN and is available amplified by a factor of 1.
5 at MPXOUT.
The MPX signal is blanked out in the event of multipath interference or when MUTE is activated externally in the circuit part MNC (Multipath Noise Canceller).
In all other cases, the MPX signal passes through the IC unchanged.
MUTE MUTE 94 8651 The function unit MNC can be controlled externally via this pin.
Blanking occurs wh...


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