AK4492ECB Datasheet, PDF (44/101 Pages) Asahi Kasei Microsystems – Quality Oriented 32-Bit 2ch DAC

[AK4492]
(2)-2. Auto Setting Mode (AFSD bit= “0”, ACKS bit = “1”)
MCLK frequency and the sampling speed are detected automatically (Table 14) and DFS[2:0] bits are
ignored. The MCLK frequency corresponding to each sampling speed should be provided externally
(Table 15, Table 16).
Table 14. Sampling Speed (Auto Setting Mode)
MCLK
Sampling Speed
1152fs/1024fs
Normal (fs  32kHz)
512fs/256fs 768fs/384fs
Normal
256fs
384fs
Double
128fs
192fs
Quad
64fs
96fs
Oct
32fs
48fs
Hex
Table 15. System Clock Example (Auto Setting Mode)
LRCK
MCLK (MHz)
fs
32fs
48fs
64fs
96fs
128fs
32.0 kHz
N/A
N/A
N/A
N/A
N/A
44.1 kHz
N/A
N/A
N/A
N/A
N/A
48.0 kHz
N/A
N/A
N/A
N/A
N/A
88.2 kHz
N/A
N/A
N/A
N/A
N/A
96.0 kHz
N/A
N/A
N/A
N/A
N/A
176.4 kHz
N/A
N/A
N/A
N/A
22.5792
192.0 kHz
N/A
N/A
N/A
N/A
24.5760
384 kHz
N/A
N/A
24.576
36.864
N/A
768 kHz
24.576
36.864
N/A
N/A
N/A
(N/A: Not available)
Sampling
Speed
Normal
Double
Quad
Oct
Hex
LRCK
fs
192fs
32.0 kHz
N/A
44.1 kHz
N/A
48.0 kHz
N/A
88.2 kHz
N/A
96.0 kHz
N/A
176.4 kHz 33.8688
192.0 kHz 36.8640
384 kHz
N/A
768 kHz
N/A
(N/A: Not available)
Table 16. System Clock Example (Auto Setting Mode)
MCLK (MHz)
256fs
384fs
512fs
768fs
1024fs
8.1920 12.2880 16.3840 24.5760 32.7680
11.2896 16.9344 22.5792 33.8688
N/A
12.2880 18.4320 24.5760 36.8640
N/A
22.5792 33.8688
N/A
N/A
N/A
24.5760 36.8640
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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
Oct
Hex
When MCLK= 256fs/384fs, auto setting mode supports sampling rate from 8kHz to 96kHz (Table 14).
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 17. DR and S/N Relationship with MCLK Frequency (fs = 44.1kHz)
ACKS bit
MCLK
DR, S/N
0
256fs/384fs/512fs/768fs
123 dB
1
256fs/384fs
512fs/768fs
120 dB
123 dB
Note 48. This Characteristic is supported by using External Circuit (Figure 74)
016011073-E-00
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2016/12