ak4589 AKM Semiconductor, Inc., ak4589 Datasheet - Page 26

• Manufacturer Part Number: ak4589
• Description: 2/8-channel Audio Codec With Dir
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4589 includes the digital de-emphasis filter (tc=50/15µs) 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”).
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).
MS0339-E-00
De-emphasis Filter
Digital High Pass Filter
(Note: At Quad speed mode (DFS1= “1”, DFS0 = “0”) are not available for ADC.)
Mode
Table 5. System Clock Example (Quad Speed Mode @Manual Setting Mode)
0
1
2
3
176.4kHz
192.0kHz
LRCK1
176.4kHz
192.0kHz
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
LRCK1
Fs
fs
Sampling Speed
Table 7. System Clock Example (Auto Setting Mode)
Normal Speed
Normal Speed
Normal Speed
Normal Speed
Table 6. Sampling Speed (Auto Setting Mode)
22.5792
24.5760
128fs
22.5792
24.5760
128fs
-
-
-
-
-
Table 8. De-emphasis control
MCLK
512fs
256fs
128fs
MCLK (MHz)
MCLK (MHz)
22.5792
24.5760
192fs
256fs
DEM1
-
-
-
-
-
-
-
- 26 -
Sampling Speed
0
0
1
1
Normal
Double
Quad
16.3840
22.5792
24.5760
512fs
DEM0
256fs
-
-
-
-
-
-
0
1
0
1
44.1kHz
BICK1 (MHz)
48kHz
32kHz
Sampling
DEM
OFF
Normal
Double
Speed
Quad
11.2896
12.2880
64fs
Default
[AK4589]
2004/09