AK7755EN_16 Datasheet, PDF (28/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
2-4. Slave Mode 3 (CKM mode 5: BICK Input Clock)
CKM mode5 is the mode that operates DSP, ADC and DAC by 16kHz sampling frequency when LRCK
sampling frequency is 8kHz. Set BICK frequency against LRCK by BITFS[1:0] bits. Each sampling
frequency is fixed (LRCK = 8kHz, DSP/ADC/DAC = 16kHz).
LRCK
BICK
SDIN1
SDOUT1
(fs=8kHz)
16k/8k
Converter
AK7755
DSP/ADC/DAC
(fs=16kHz)
SDIN2
SDOUT2
SDOUT3
(fs=16kHz)
Figure 18. Slave Mode3 (CKM mode5) Sampling Frequency Setting
fs: Sampling Frequency
DFS
BITFS
BICK Frequency
[2:0]
fs
[1:0] BICK 44.1kHz series 48kHz series
0h
8kHz
0h
64fs
470.4kHz
512kHz
0h
8kHz
1h
48fs
352.8kHz
384kHz
0h
8kHz
2h
32fs
235.2kHz
256kHz
0h
8kHz
3h
256fs
1881.6kHz
2048kHz
1h
12kHz
0h
64fs
705.6kHz
768kHz
1h
12kHz
1h
48fs
N/A
N/A
1h
12kHz
2h
32fs
352.8kHz
384kHz
1h
12kHz
3h
256fs
2822.4kHz
3072kHz
2h
16kHz
0h
64fs
940.8kHz
1024kHz
2h
16kHz
1h
48fs
705.6kHz
768kHz
2h
16kHz
2h
32fs
470.4kHz
512kHz
2h
16kHz
3h
256fs
3763.2kHz
4096kHz
3h
24kHz
0h
64fs
1.4112MHz 1.536MHz
3h
24kHz
1h
48fs
1058.4MHz 1.152MHz
3h
24kHz
2h
32fs
705.6kHz
768kHz
3h
24kHz
3h
256fs
5.6448MHz 6.144MHz
4h
32kHz
0h
64fs
1.8816MHz 2.048MHz
4h
32kHz
1h
48fs
1.4112MHz 1.536MHz
4h
32kHz
2h
32fs
0.9408MHz 1.024MHz
4h
32kHz
3h
256fs
7.5264MHz 8.192MHz
5h
48kHz
0h
64fs
2.8224MHz 3.072MHz
5h
48kHz
1h
48fs
2.1168MHz 2.304MHz
5h
48kHz
2h
32fs
1.4112MHz 1.536MHz
5h
48kHz
3h
256fs 11.2896MHz 12.288MHz
6h
96kHz
0h
64fs
5.6448MHz 6.144MHz
6h
96kHz
1h
48fs
4.2336MHz 4.608MHz
6h
96kHz
2h
32fs
2.8224MHz 3.072MHz
6h
96kHz
3h
256fs 22.5792MHz 24.576MHz
7h
N/A
－
－
－
－
(N/A: Not available)
Table 1. Clock Select
014006643-E-00
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2014/10