AK4497 Datasheet, PDF (40/98 Pages) Asahi Kasei Microsystems – Quality Oriented 32-Bit 2ch DAC

[AK4497]
1-2. Auto Setting Mode (AFSD bit= “0”, ACKS bit = “1”)
MCLK frequency and the sampling speed are detected automatically (Table 13) and DFS[2:0] bits are
ignored. The MCLK frequency corresponding to each sampling speed should be provided externally
(Table 14, Table 15).
Table 13. Sampling Speed (Auto Setting Mode)
MCLK
Sampling Speed
1152fs
Normal (fs32kHz)
512fs/256fs 768fs/384fs
Normal
256fs
384fs
Double
128fs
192fs
Quad
64fs
96fs
Oct
32fs
48fs
Hex
Table 14. System Clock Example (Auto Setting Mode)
LRCK
MCLK(MHz)
Sampling
Speed
fs
32fs 48fs 64fs 96fs 128fs
32.0kHz ^N/A
N/A
N/A
N/A
N/A
Normal
44.1kHz
N/A
N/A
N/A
N/A
N/A
48.0kHz
N/A
N/A
N/A
N/A
N/A
88.2kHz ^N/A
N/A
N/A
N/A
N/A
Double
96.0kHz
N/A
N/A
N/A
N/A
N/A
176.4kHz ^N/A
N/A
N/A
N/A 22.5792 _Quad
192.0kHz ^N/A
N/A
N/A
N/A 24.5760 _Quad
384kHz
N/A
N/A 24.576 36.864
N/A
Oct
768kHz ^{24.576 36.864 N/A}
N/A
N/A
Hex
LRCK
fs
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
176.4kHz
192.0kHz
384kHz
768kHz
Table 15. System Clock Example (Auto Setting Mode)
MCLK(MHz)
192fs
N/A
N/A
N/A
N/A
N/A
33.8688
36.8640
N/A
N/A
256fs
8.1920
11.2896
12.2880
22.5792
24.5760
N/A
N/A
N/A
N/A
384fs
12.2880
16.9344
18.4320
33.8688
36.8640
N/A
N/A
N/A
N/A
512fs
16.3840
22.5792
24.5760
N/A
N/A
N/A
N/A
N/A
N/A
768fs
24.5760
33.8688
36.8640
N/A
N/A
N/A
N/A
N/A
N/A
1152fs
36.8640
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Sampling
Speed
Normal
Double
Quad
Quad
Oct
Hex
When MCLK= 256fs/384fs, auto setting mode supports sampling rate from 8kHz to 96kHz (Table 13).
However, the DR and S/N performances will degrade approximately 3dB as compared to when MCLK =
256fs/384fs for DR and MCLK= 512fs/768fs for S/N, respectively if the sampling rate is under 54kHz.
Table 16. DR and S/N Relationship with MCLK Frequency (fs = 44.1kHz)
ACKS bit
MCLK
DR,S/N
0
256fs/384fs/512fs/768fs
127dB
1
256fs/384fs
124dB
1
512fs/768fs
127dB
Rev. 0.1
- 40 -
2015/11