[AK4438]
■ De-emphasis Filter
The AK4438 has a digital de-emphasis filter (tc=50/15µs) by an IIR filter. The de-emphasis filter only
supports Normal Speed Mode. This filter corresponds to three sampling frequencies (32kHz, 44.1kHz,
48kHz). De-emphasis of each DAC can be set individually for DAC1(SDTI1), DAC2(SDTI2),
DAC3(SDTI3) and DAC4(SDTI4) by register settings.
Mode
Sampling Speed
Mode
DEM11
(DEM41-21) (DEM40-20)
DEM10
DEM
0
1
2
3
Normal Speed Mode
Normal Speed Mode
Normal Speed Mode
Normal Speed Mode
0
0
1
1
0
1
0
1
44.1kHz
OFF
48kHz
32kHz
(default)
Table 8. De-emphasis Control
016001925-E-00
2016/03
- 24 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
