AK4490 Datasheet, PDF (28/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490]
(1) Parallel Mode (PSN pin = “H”)
1. Manual Setting Mode (ACKS pin = “L”)
The MCLK frequency corresponding to each sampling speed should be provided externally (Table 3). DFS1-0
bit is fixed to “00”. In this mode, quad speed and double speed modes are not available.
LRCK
MCLK (MHz)
BICK
fs
128fs
192fs
256fs
384fs
512fs
768fs 1152fs
64fs
32.0kHz N/A
N/A 8.1920 12.2880 16.3840 24.5760 36.8640 2.0480MHz
44.1kHz N/A
N/A 11.2896 16.9344 22.5792 33.8688 N/A 2.8224MHz
48.0kHz N/A
N/A 12.2880 18.4320 24.5760 36.8640 N/A 3.0720MHz
Table 3. System Clock Example (Manual Setting Mode @Parallel Mode) (N/A: Not available)
In manual setting mode, the AK4490 supports sampling rate from 32kHz to 96kHz (Table 4). However, the
DR and S/N performances of when MCLK=256fs/384fs will degrade approximately 3dB as compared to when
MCLK=512fs/768fs if the sampling rate is 32kHz~48kHz.
ACKS pin
MCLK
DR,S/N
L
256fs/384fs/512fs/768fs
120dB
H
256fs/384fs
117dB
H
512fs/768fs
120dB
Table 4. Relationship of MCLK Frequency and DR, S/N Performance (fs = 44.1kHz)
2. Auto Setting Mode (ACKS pin = “H”)
In auto setting mode, MCLK frequency and sampling frequency are detected automatically (Table 5). MCLK
of corresponded frequency to each sampling speed mode should be input externally. (Table 6)
MCLK
Sampling Speed
1152fs
Normal (fs32kHz)
512/256fs 768/384fs
Normal
256fs
384fs
Double
128fs
192fs
Quad
64fs
96fs
Oct
32fs
48fs
Hex
Table 5. Sampling Speed (Auto Setting Mode @Parallel Mode)
LRCK
MCLK (MHz)
fs
32fs 48fs 64fs 96fs 128fs 192fs 256fs 384fs 512fs 768fs 1152fs
32.0kHz ^{N/A N/A N/A N/A}
N/A
N/A 8.192 12.288 16.384 24.576 36.864
44.1kHz ^{N/A N/A N/A N/A}
N/A
N/A 11.2896 16.9344 22.5792 33.8688 N/A
48.0kHz ^{N/A N/A N/A N/A}
N/A
N/A 12.288 18.432 24.576 36.864 N/A
88.2kHz ^{N/A N/A N/A N/A} N/A
N/A 22.5792 33.8688 N/A
N/A
N/A
96.0kHz ^{N/A N/A N/A N/A} N/A
N/A 24.576 36.864 N/A
N/A
N/A
176.4kHz ^{N/A N/A N/A N/A} 22.5792 33.8688 N/A
N/A
N/A
N/A
N/A
192.0kHz ^{N/A N/A N/A N/A} 24.576 36.864 N/A
N/A
N/A
N/A
N/A
384kHz ^{N/A N/A 24.576 36.864 N/A}
N/A
N/A
N/A
N/A
N/A
N/A
768kHz ^{24.576 36.864 N/A N/A N/A}
N/A
N/A
N/A
N/A
N/A
N/A
Table 6. System Clock Example (Auto Setting Mode @Parallel Mode) (N/A: Not available)
Sampling
Speed
Normal
Double
Quad
Quad
Oct
Hex
MS1648-E-03
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2014/11