DESCRIPTION
The TDA7513 is the first device for car-radio applications
that combines full RF front-end functions
with audio-processing capabilities.
As far as FM and AM functions are concerned , the
TDA7513 features front-end processing, including
the digital tuning PLL, IF processing with demodulation
and variable-bandwidth IF filtering (ISS),
stop station and quality detection functions, FM
stereo decoding by means of a fully-integrated,
adjustment-free dedicated PLL and, finally, FM
noise blanking. The FM stereo decoder and noise
blanker functions are realized entirely without external
components.
The audio processor section comprises input selectors
for two quasi-differential external sources,
volume control, tone control (bass, mid and treble),
balance and fading control to drive four output
channels. A soft mute function and an RDS
mute function are included to handle source
change as well as RDS AF search without abrupt
changes in the audio level.
Most of the parameters in the front-end section are
I2Cbus-driven and therefore under the control of
the car-radio maker. The I2C bus allows furthermore
the user to realize the full electric alignment
of all the external coils, therefore removing the
need for hand-made or mechanical adjustments.