[AK4480]
(2) Serial Mode (P/S pin = “L”)
1. Manual Setting Mode (ACKS bit = “0”)
MCLK frequency is detected automatically and the sampling speed is set by DFS1-0 bits (Table 8). The MCLK frequency
corresponding to each sampling speed should be provided (Table 9). The AK4480 is set to Manual Setting Mode at
power-up (PDN pin = “L” → “H”). When DFS1-0 bits are changed, the AK4480 should be reset by RSTN bit.
DFS1 bit DFS0 bit
Sampling Rate (fs)
(default)
0
0
1
0
1
0
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
30kHz ∼ 54kHz
54kHz ∼ 108kHz
120kHz ∼ 216kHz
Table 8. Sampling Speed (Manual Setting Mode @Serial Mode)
LRCK
fs
MCLK (MHz)
BICK
64fs
128fs
N/A
N/A
192fs
N/A
N/A
256fs
8.1920
11.2896
12.2880
22.5792
24.5760
N/A
384fs
12.2880
16.9344
18.4320
33.8688
36.8640
N/A
512fs
16.3840
22.5792
24.5760
N/A
N/A
N/A
N/A
768fs
24.5760
33.8688
36.8640
N/A
N/A
N/A
N/A
1152fs
36.8640
N/A
N/A
N/A
N/A
N/A
N/A
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
176.4kHz
192.0kHz
2.0480MHz
2.8224MHz
3.0720MHz
5.6448MHz
6.1440MHz
11.2896MHz
12.2880MHz
N/A
N/A
11.2896
12.2880
22.5792
24.5760
16.9344
18.4320
33.8688
36.8640
N/A
N/A
Table 9. System Clock Example (Manual Setting Mode @Serial Mode)
2. Auto Setting Mode (ACKS bit = “1”)
MCLK frequency and the sampling speed are detected automatically (Table 10) and DFS1-0 bits are ignored. The MCLK
frequency corresponding to each sampling speed should be provided (Table 11).
MCLK
1152fs
Sampling Speed
Normal (fs≤32kHz)
Normal
512fs/256fs
768fs/384fs
384fs
256fs
128fs
Double
Quad
192fs
Table 10. Sampling Speed (Auto Setting Mode @Serial Mode)
LRCK
fs
MCLK (MHz)
Sampling
Speed
128fs
N/A
N/A
N/A
N/A
N/A
22.5792
24.5760
192fs
N/A
N/A
N/A
N/A
N/A
33.8688
36.8640
256fs
8.1920
11.2896
12.2880
22.5792
24.5760
N/A
384fs
12.2880
16.9344
18.4320
33.8688
36.8640
N/A
512fs
16.3840
22.5792
24.5760
N/A
N/A
N/A
N/A
768fs
24.5760
33.8688
36.8640
N/A
N/A
N/A
N/A
1152fs
36.8640
N/A
N/A
N/A
N/A
N/A
N/A
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
176.4kHz
192.0kHz
Normal
Double
Quad
N/A
N/A
Table 11. System Clock Example (Auto Setting Mode @Serial Mode)
MS1146-E-03
2012/01
- 19 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
