TDA7406TR STMicroelectronics, TDA7406TR Datasheet - Page 36

• Manufacturer Part Number: TDA7406TR
• Description: IC PROCESSOR CAR SIGNAL 44-TQFP
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of TDA7406TR

• Applications: Automotive Systems
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description of Stereodecoder
8.2
8.3
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Figure 24. Signals during stereodecoder's SoftMute
Figure 25. Signal-Control via SoftMute-Pin
InGain + InFilter
The InGain stage allows to adjust the MPX-signal to an internal magnitude of about 1V
which is the recommended value. The 4.th order input filter has a corner frequency of 80kHz
and is used to attenuate spikes and noise and acts as an anti-aliasing filter for the following
switch capacitor filters.
Demodulator
In the demodulator block the left and the right channel are separated from the MPX-signal.
In this stage also the 19-kHz pilot tone is cancelled. For reaching a high channel separation
the TDA7406 offers an I
compensate the lowpass behavior of the tuner section. If the tuner's attenuation at 38kHz is
in a range from 7.2% to 31.0% the TDA7406 needs no external network in front of the MPX-
pin. Within this range an adjustment to obtain at least 40dB channel separation is possible.
The bits for this adjustment are located together with the fieldstrength adjustment in one
byte. This gives the possibility to perform an optimization step during the production of the
car radio where the channel separation and the fieldstrength control are trimmed. The setup
of the Stereoblend characteristics which is programmable in a wide range is described in
Section
8.8.
2
C-bus programmable roll-off adjustment which is able to
TDA7406
rms