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7403 Folha de dados(PDF) 7 Page - STMicroelectronics

Nome de Peças 7403
Descrição Electrónicos  BASIC SIGNAL PROCESSOR
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Input stages
The input circuits are the same as in preceeding
ST audioprocessors with exception of the CD in-
puts (see figure 1).
The typical input impedance is 100k
Ω.
AutoZero
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 In-Gain stage would be transferred or
even amplified to the output.
To avoid that effect a special offset cancellation
stage called AutoZero is implemented.
To avoid audible clicks the audioprocessor is
muted before the loudness stage during this time.
In some cases, for example if the
µP is executing
a refresh cycle of the I
2C bus programming, it is
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 TDA7403 could be switched in the ”Auto
Zero Remain” mode (Bit 6 of the subaddress
byte). If this bit is set to high, the DATABYTE 0
could be loaded without invoking the AutoZero
and the old adjustment value remains.
Mixing Stage
This stage offers the possibility to mix the internal
beep or the phone signal to any other source.
Due to the fact that the mixing stage is also lo-
cated behind the In-Gain stage fine adjustments
of the main source level can be done in this way.
Loudness
There are four parameters programmable in the
loudness stage (see fig. 2, 3, 4):
- Attenuation
- Center Frequency
- Loudness Q
- Flat Mode: in this mode the loudness stage works
as a 0 - 15dB attenuator.
D98AU951
100K
100K
100K
STEREODECODER
IN GAIN
CASSETTE
AM
MPX
Figure 1. Input stages
-20.0
-15.0
-10.0
-5.0
0.0
10.0
100.0
1.0K
10.0K
Figure 2. Loudness Attenuation @ fc = 400Hz
(second order)
-20.0
-15.0
-10.0
-5.0
0.0
10.0
100.0
1.0K
10.0K
Figure 3. Loudness Center frequency @ Attn.
= 15dB (second order)
DESCRIPTION OF THE AUDIOPROCESSOR
TDA7403
7/26


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