AK4665A Datasheet, PDF (26/52 Pages) Asahi Kasei Microsystems – 20-Bit Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4665A]
„ De-emphasis Filter (DEM)
The AK4665A includes a digital de-emphasis filter (tc = 50/15µs) by IIR filter corresponding to three sampling
frequencies (32kHz, 44.1kHz and 48kHz). The de-emphasis filter is enabled by setting DEM1-0 bits (Table 21).
DEM1 DEM0 De-emphasis
0
0
44.1kHz
0
1
OFF
Default
1
0
48kHz
1
1
32kHz
Table 21. De-emphasis Control
„ Bass Boost Function (BOOST)
By controlling BST1-0 bits, the bass boost signal can be output from DAC. The setting value is common in Lch and Rch
(Table 22). The frequency of bass boost filter scales sampling frequency.
BST1
0
0
1
1
BST0
BOOST
0
OFF
1
MIN
0
MID
1
MAX
Table 22. Bass Boost
Default
Boost Filter (fs=44.1kHz)
20
MAX
15
MID
10
MIN
5
0
-5
10
100
1000
Frequency [Hz]
Figure 16. Bass Boost Frequency (fs=44.1kHz)
10000
MS0440-E-01
- 26 -
2006/05