ak4673 AKM Semiconductor, Inc., ak4673 Datasheet - Page 52

• Manufacturer Part Number: ak4673
• Description: Stereo Codec With Mic/hp-amp And Touch Screen Controller
• Manufacturer: AKM Semiconductor, Inc.

■
The AK4673 includes the digital de-emphasis filter (tc = 50/15μs) by IIR filter. Setting the DEM1-0 bits enables the
de-emphasis filter
■
The BST1-0 bits control the amount of low frequency boost applied to the DAC output signal
bits are set to “01” (MIN Level), use a 47μF capacitor for AC-coupling. If the boosted signal exceeds full scale, the analog
output clips to the full scale.
MS0670-E-01
De-emphasis Filter
Bass Boost Function
-10
-15
-20
-25
-5
0
10
MAX
MID
MIN
(Table
37).
Figure 37
Figure 37. Bass Boost Frequency Response (fs=44.1kHz)
DEM1
BST1
0
0
1
1
0
0
1
1
shows the boost frequency response at –20dB signal input.
Table 37. De-emphasis Control
Boost Filter (fs=44.1kHz)
100
Table 38. Bass Boost Control
DEM0
0
1
0
1
BST0
0
1
0
1
Frequency [Hz]
- 52 -
44.1kHz
48kHz
32kHz
Mode
OFF
Mode
MAX
OFF
MIN
MID
1000
(default)
(default)
(Table
38). If the BST1-0
10000
[AK4673]
2007/10