
ASAHI KASEI
[AK4589]
MS0339-E-00
2004/09
-
26
-
LRCK1
MCLK (MHz)
BICK1 (MHz)
Fs 128fs 192fs 256fs
64fs
176.4kHz 22.5792
-
-
11.2896
192.0kHz 24.5760
-
-
12.2880
Table 5. System Clock Example (Quad Speed Mode @Manual Setting Mode)
(Note: At Quad speed mode (DFS1= “1”, DFS0 = “0”) are not available for ADC.)
MCLK Sampling
Speed
512fs Normal
256fs Double
128fs Quad
Table 6. Sampling Speed (Auto Setting Mode)
LRCK1 MCLK
(MHz)
fs 128fs 256fs
512fs
Sampling
Speed
32.0kHz -
- 16.3840
44.1kHz -
- 22.5792
48.0kHz -
- 24.5760
Normal
88.2kHz - 22.5792 -
96.0kHz - 24.5760 -
Double
176.4kHz 22.5792
-
-
192.0kHz 24.5760
-
-
Quad
Table 7. System Clock Example (Auto Setting Mode)
De-emphasis Filter
The AK4589 includes the digital de-emphasis filter (tc=50/15
µ
s) by IIR filter. De-emphasis filter is not available in
Double Speed Mode and Quad Speed Mode. This filter corresponds to three sampling frequencies (32kHz, 44.1kHz,
48kHz). De-emphasis of each DAC can be set individually by register data of DEMA1-C0 bits (DAC1: DEMA1-0 bits,
DAC2: DEMB1-0 bits, DAC3: DEMC1-0 bits, DAC4: DEMD1-0 bits, see “Register Definitions”).
Mode Sampling
Speed DEM1
DEM0 DEM
0 Normal
Speed 0 0
44.1kHz
1 Normal
Speed 0 1 OFF
2 Normal
Speed 1 0
48kHz
3 Normal
Speed 1 1
32kHz
Default
Table 8. De-emphasis control
Digital High Pass Filter
The ADC has a digital high pass filter for DC offset cancel. The cut-off frequency of the HPF is 1.0Hz at fs=48kHz and
scales with sampling rate (fs).