AUTOMOTIVE RADIO TUNERS--MT1502EDC DAB/DMB TUNER

The MT1502EDC is a tuner
module for reception in VHF Band
III and L-Band, compliant to the
DAB EUREKA 147 standard. It
performs a down conversion and
filtering of the RF signal before it is
provided into an integrated 12 bit
analog to digital converter (ADC).
The output signal is a digital
intermediate frequency (IF) suitable
for further signal processing with a
generic or an application-specific
DSP.
In order to minimize interferences
and distortion caused by undesired
signals in adjacent channels, the
tuner section of the module features
digitally aligned tracking filters and
an integrated IF SAW filter.
Moreover an automatic gain control
(AGC) is implemented which
attenuates large RF input signals in
order to keep distortion at very low
levels. A WAGC pin provides the
possibility to freeze this AGC during
the null symbol of the DAB signal to
prevent the tuner from
overamplifying as the transmission
re-continues.
For clock synchronization
between the analog to digital
converter (ADC) and the DAB
backend (DSP) the MT1502EDC
offers a clock output. Incorrect
samples which may result from a
distorted input signal are indicated
at the OTR pin. Through another
pin connector the ADC can be shut
down completely to save energy.
The MT1502EDC has been
optimized to meet the specific
requirements of automotive
applications and provides reliable
performance even under harsh
environmental conditions like
temperatures from -40