Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA7409 Datenblatt(PDF) 8 Page - STMicroelectronics |
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TDA7409 Datenblatt(HTML) 8 Page - STMicroelectronics |
8 / 25 page TDA7409 8/25 1.2 AutoZero In order to reduce the number of pins there is no AC coupling between the In-Gain and the following stage, so that any offset generated by or before 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. This stage is located before the Mixing-block to eliminate all offsets generated by the Input-Stages and the In-Gain (Please notice that externally generated offsets, e.g. generated through the leakage current of the coupling capacitors, are not canceled). The auto-zeroing is started every time the DATA-BYTE 0 (Input Selector/Gain) is selected and takes a time of max. 0.3ms. To avoid audible clicks the Audioprocessor is muted before the loudness stage during this time. 1.2.1 AutoZero-Remain In some cases, for example if the uP is executing a refresh cycle of the IIC-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 applications the TDA7409 could be switched in the AutoZero-Remain-Mode (I2 bit 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. 1.3 Mixing Stage The 4 step 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 mixing-stage is located behind the In-Gain-stage fine adjustments of the main source level could be done in this way. Figure 2. Signal-Flow of Mixing-Stage 1.4 Loudness There are four parameters programmable in the loudness stage: 1.4.1 Attenuation Figure 3 shows the attenuation as a function of frequency at fC = 400Hz. SE1 INGAIN MIXING LOUDNESS MIXING LEVEL INPUT BEEP 25K 0dB -100dB -3.5dB -9.6dB -6dB -6dB -12dB -2.5dB INPUT SELECTOR + - SE2 SE3 SE4 BEEP D00AU1181 / / / / / |
Ähnliche Teilenummer - TDA7409 |
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Ähnliche Beschreibung - TDA7409 |
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