ak4628 AKM Semiconductor, Inc., ak4628 Datasheet - Page 17

• Manufacturer Part Number: ak4628
• Description: High Performance Multi Channel Audio Codec
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
T De-emphasis Filter
The AK4628 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 (DAC1: DEMA1-0, DAC2:
DEMB1-0, DAC3: DEMC1-0, DAC4: DEMD1-0, see “Register Definitions”).
T 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).
MS0211-E-02
Mode
0
1
2
3
176.4kHz
192.0kHz
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
LRCK
fs
Sampling Speed
Table 6. System Clock Example (Auto Setting Mode)
Normal Speed
Normal Speed
Normal Speed
Normal Speed
Table 5. Sampling Speed (Auto Setting Mode)
22.5792
24.5760
128fs
-
-
-
-
-
Table 8. De-emphasis control
MCLK
512fs
256fs
128fs
MCLK (MHz)
22.5792
24.5760
256fs
DEM1
-
-
-
-
-
- 17 -
Sampling Speed
0
0
1
1
Normal
Double
Quad
16.3840
22.5792
24.5760
512fs
DEM0
-
-
-
-
0
1
0
1
44.1kHz
48kHz
32kHz
Sampling
DEM
OFF
Normal
Double
Speed
Quad
Default
[AK4628]
2004/03