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TDA4445A and TDA4445B:
Quadrature intercarrier demodulator
Very high input sensitivity
Good signal to noise ratio
Fast averaging AGC
*
IF amplifier
can
be switched off for VTR mode
Good AM
*
suppression
Output signal stabilized against supply voltage variations
Very few external components
Description
TDA4445A:
Sound IF amplifier, with FM
*
processing for quasi parallel
sound
system.
TDA4445B:
Sound IF amplifier, with FM
*
processing and AM
*
demodulator, for multi-standard
sound
TV appli-ances.
TDA4445B additionnal:
Bistandard applications (B/G and L)
No adjustment of the AM
*
demodulator
Low AM
*
distortion
Pin-layout:
IF input
not to be connected
IF AGC
*
time constant
not to be connected
TDA4445A: not to be connected, TDA4445B: averaging capacitor
TDA4445A: not to be connected, TDA4445B: A.F.
sound
output
not to be connected
reference L.C.
network
reference L.C.
network
not to be connected
supply voltage
FM
*
modulated
sound
output
ground
not to be connected
not to be connected
IF input
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