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AKD4387 Datasheet(PDF) 11 Page - Asahi Kasei Microsystems |
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AKD4387 Datasheet(HTML) 11 Page - Asahi Kasei Microsystems |
11 / 21 page ASAHI KASEI [AK4387] MS0429-E-00 2005/09 - 11 - LRCK BICK (64fs) SDTI 03 1 2 24 31 0 1 31 0 1 23:MSB, 0:LSB 22 1 0 Don’t care 23 Lch Data Rch Data 23 25 3 224 23 25 22 1 0 Don’t care 23 23 Figure 4. Mode 3 Timing De-emphasis Filter A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15µs) and is enabled or disabled with DEM0 and DEM1. In case of double speed and quad speed mode, the digital de-emphasis filter is always off. DEM1 DEM0 Mode 0 0 44.1kHz 0 1 OFF Default 1 0 48kHz 1 1 32kHz Table 8. De-emphasis Filter Control (Normal Speed Mode) Output Volume The AK4387 includes channel independent digital output volumes (ATT) with 256 levels at linear step including MUTE. These volumes are in front of the DAC and can attenuate the input data from 0dB to –48dB and mute. When changing levels, transitions are executed via soft changes; thus no switching noise occurs during these transitions. The transition time of 1 level and all 256 levels is shown in Table 10. Transition Time Sampling Speed 1 Level 255 to 0 Normal Speed Mode 4LRCK 1020LRCK Double Speed Mode 8LRCK 2040LRCK Quad Speed Mode 16LRCK 4080LRCK Table 9. ATT Transition Time |
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