ak4387 AKM Semiconductor, Inc., ak4387 Datasheet - Page 11

• Manufacturer Part Number: ak4387
• Description: 106db 192khz 24-bit 2ch ?? Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
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.
MS0429-E-00
De-emphasis Filter
Output Volume
SDTI
BICK
(64fs)
LRCK
0
1
23
23:MSB, 0:LSB
Sampling Speed
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
2
22
Table 8. De-emphasis Filter Control (Normal Speed Mode)
3
23
Lch Data
1
24
DEM1
Table 9. ATT Transition Time
0
Figure 4. Mode 3 Timing
0
0
1
1
25
Don’t care
DEM0
16LRCK
4LRCK
8LRCK
1 Level
- 11 -
31
0
1
0
1
0
Transition Time
44.1kHz
48kHz
32kHz
Mode
1
OFF
23
2
22
3
Default
1020LRCK
2040LRCK
4080LRCK
255 to 0
23
Rch Data
1
24
0
25
Don’t care
31
0
[AK4387]
2005/09
1
23