U4276B Datasheet, PDF (2/8 Pages) TEMIC Semiconductors – FM Multipath Noise Cancellation

U4276B
FSIN / BFSOUT
FSIN
40 mA
V_S
BFSOUT
MPXIN / MPXOUT
V_S
50 kW
MPXIN
50 kW
94 8647
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 character-
istics of the IF IC and is available at BFSOUT.
AVFS
94 8649
V_S
V_S
60 kW
MPXOUT
40 mA
AVFS
94 8648
The fieldstrength signal at buffer output BFSOUT is aver-
aged over time and applied to input AVFS via an RC
low-pass filter with a large time constant.
60 kW
200 mA
94 8650
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 acti-
vated 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 when the voltage at the MUTE
pin falls below 1 V.
2 (8)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 05-Sep-96