E-TDA7462DTR STMicroelectronics, E-TDA7462DTR Datasheet - Page 9

• Manufacturer Part Number: E-TDA7462DTR
• Manufacturer: STMicroelectronics

Specifications of E-TDA7462DTR

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Package Type: SOIC
• Lead Free Status / RoHS Status: Compliant

offers the full common-mode rejection even with
those CD players.
AutoZero Stage
In order to reduce the number of pins there is no
AC coupling between the In-Gain and the follow-
ing stage, so that any offset generated by or be-
fore the stage would be transferred or even am-
plified to the output. To avoid that effect, a special
offset cancellation stage called AutoZero is imple-
mented. This stage is located before the mixing
block to eliminate all offsets generated by the in-
put and the In-Gain (notice that externally gener-
ated offsets, e.g. generated through the leakage
current of the coupling capacitors, are not can-
celled).
The auto-zeroing is started every time the data-
byte 0 is selected and takes a time of max.
0.3ms. To avoid audible clicking the audioproces-
sor is muted before the loudness stage during
this time.
Figure 2. Signal Flow of Mixing Stage.
a refresh cycle of the I
AutoZero Remain
In some cases, for example if the P is executing
not useful to start a new AutoZero action because
no new source is selected and an undesired mute
would appear at the outputs. For such applica-
tions the TDA7462 could be switched in the
AutoZeroRemain mode. If this bit is set to high,
the databyte 0 could be loaded without invoking
the AutoZero and the old adjustment value re-
mains.
Full Mixing Stage
The four-level mixing stage offers the possibility
to mix the rear selector signal or the phone signal
to any other source. Due to the fact that the mix-
ing stage is located after the In-Gain stage fine
adjustments of the main source level could be
done in this way.
2
C bus programming, it is
TDA7462
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