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TDA7419 Datasheet(PDF) 11 Page - STMicroelectronics |
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TDA7419 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 30 page 11/30 TDA7419 5.3.4 Flat Mode In flat mode the loudness stage works as a 0dB to -15dB attenuator. 5.4 SoftMute The digitally controlled SoftMute stage allows muting/demuting the signal with a I2C-bus programmable slope. The mute process can either be activated by the SoftMute pin or by the I2C-bus. This slope is real- ized in a special S-shaped curve to mute slow in the critical regions (see Figure 8). For timing purposes the Bit0 of the I2C-bus output register is set to 1 from the start of muting until the end of demuting. Figure 8. Sofmute Timing Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal 5.5 SoftStep-Volume When the volume-level is changed audible clicks could appear at the output. The root cause of those clicks could either be a DC-Offset before the volume-stage or the sudden change of the envelope of the audi- osignal. With the SoftStep feature both kinds of clicks could be reduced to a minimum and are no more audible. The blend-time from one step to the next is programmable in four steps. Figure 9. SoftStep Timing Note: For steps more than 0.5dB the SoftStep mode should be deactivated because it could generate a hard 1dB step during the blend-time. 1 EXT. MUTE +SIGNAL REF -SIGNAL 1 I 2C BUS OUT Time D97AU634 1dB 0.5dB -0.5dB -1dB Time D00AU1170 VOUT SS Time |
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