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7403 Folha de dados(PDF) 7 Page - STMicroelectronics |
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7403 Folha de dados(HTML) 7 Page - STMicroelectronics |
7 / 26 page 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 |
Nº de peça semelhante - 7403 |
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Descrição semelhante - 7403 |
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