AK4480 AKM [Asahi Kasei Microsystems], AK4480 Datasheet - Page 26

• Manufacturer Part Number: AK4480
• Description: High Performance 114dB 32-Bit DAC
• Manufacturer: AKM [Asahi Kasei Microsystems]

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Note. The signal range is identified as 25% ~ 75% duty ratios in DSD mode. DSD signal must not go beyond this duty
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A digital de-emphasis filter is available for 32kHz, 44.1kHz or 48kHz sampling rates (tc = 50/15µs). It is enabled and
disabled with DEM1-0 pins or DEM1-0 bits. In case of 256fs/384fs and 128fs/192fs, the digital de-emphasis filter is
always off. When DSD mode, DEM1-0 bits are ignored. The setting value is held even if PCM mode and DSD mode are
switched.
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The AK4480 includes channel independent digital output volume control (ATT) with 255 levels at linear step including
MUTE. This volume control is in front of the DAC and it can attenuate the input data from 0dB to –48dB and mute. When
changing output levels, transitions are executed in soft change; thus no switching noise occurs during these transitions.
MS1146-E-03
D/A Conversion Mode Switching Timing
De-emphasis Filter
Output Volume (PCM and DSD)
D/A Data
D/A Data
range at the SACD format book (Scarlet Book).
RSTN bit
D/A Mode
RSTN bit
D/A Mode
PCM Data
Normal Speed Mode
Double Speed Mode
Figure 10. D/A Mode Switching Timing (PCM to DSD)
Figure 11. D/A Mode Switching Timing (DSD to PCM)
Quad Speed Mode
Sampling Speed
DSD Mode
DEM1
PCM Mode
0
0
1
1
DSD Data
Table 18. ATT Transition Time
Table 17. De-emphasis Control
DSD Mode
≥4/fs
DEM0
0
1
0
1
- 26 -
≥4/fs
16LRCK
4LRCK
8LRCK
4LRCK
1 Level
44.1kHz
48kHz
32kHz
Transition Time
Mode
OFF
(default)
1020LRCK
2040LRCK
4080LRCK
1020LRCK
DSD Data
255 to 0
≥0
DSD Mode
PCM Mode
PCM Data
[AK4480]
2012/01