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7403 датащи(PDF) 8 Page - STMicroelectronics |
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7403 датащи(HTML) 8 Page - STMicroelectronics |
8 / 26 page Softmute The digitally controlled softmute stage allows muting/demuting the signal with a I 2C bus pro- grammable slope. The mute process can either be activated by the softmute pin or by the I 2C bus. The slope is realized in a special S shaped curve to mute slow in the critical regions (see fig- ure 5). For timing purposes the Bit 3 of the I 2C bus out- put register is set to 1 from the start of muting un- til the end of demuting. Softstep Volume When volume level is changed often an audible click appears at the output. The root cause of those clicks could be either a DC offset before the volume stage or the sudden change of the envelope of the audio signal. With the Softstep feature both kinds of clicks could be reduced to a minimum and are no more audible (see figure 6). Bass There are three parameters programmable in the bass stage (see figs 7, 8, 9, 10): - Attenuation - Center Frequency (60, 70, 80 and 100Hz) - Quality Factors (1, 1.25, 1.5 and 2) DC Mode In this mode the DC gain is increased by 4.4dB. In addition the programmed center frequency and quality factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors. Treble There are two parameters programmable in the treble stage (see figs 11, 12): - Attenuation - Center Frequency (10, 12.5, 15 and 17.5kHz). Speaker Attenuator Due to practical aspects the steps in the speaker attenuators are not linear over the full range. At attenuations more than 24dB the steps increase from 1.5dB to 10dB (please see data byte specifi- cation). 10 100 1,000 Hz -20 -15 -10 -5 (dB) D98AU844 Figure 4. Loudness @ Attn. = 15dB, fc = 400Hz 1 EXT. MUTE +SIGNAL REF -SIGNAL 1 I 2 C BUS OUT Time D97AU634 Figure 5. Softmute Timing 2dB 1dB -1dB -2dB Time D97AU635 VOUT 10ms Figure 6. Soft Step Timing Note: Please notice that a started Mute action is always terminated and could not be interrupted by a change of the mute signal. Note: For steps more than 1dB the softstep mode should be deactivated because it could generate a 1dB error during the blend-time TDA7403 8/26 |
Аналогичный номер детали - 7403 |
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Аналогичное описание - 7403 |
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