ak4650 AKM Semiconductor, Inc., ak4650 Datasheet - Page 32

• Manufacturer Part Number: ak4650
• Description: 16bit 6 Codec With Mic/hp/spk-amp & Tsc
• Manufacturer: AKM Semiconductor, Inc.

L
The AK4650 includes the digital de-emphasis filter (tc = 50/15 s) by IIR filter. Setting the DEM1-0 bits enables the
de-emphasis filter (Table 23).
L
The BST1-0 bits control the amount of low frequency boost applied to the DAC output signal (Table 24). If the BST1-0
bits are set to “10” (MID Level), AC-coupling capacitor can be sized down to 47 F. If the boosted signal exceeds the full
scale, the analog output clips to the full scale. Figure 20 shows the boost frequency response at –20dB signal input.
MS0502-E-01
De-emphasis Filter
Bass Boost Function
20
15
10
-5
5
0
10
MAX
MID
MIN
DEM1
BST1
0
0
1
1
Figure 20. Bass Boost Frequency (fs=48kHz)
0
0
1
1
Table 23. De-emphasis Control
Table 24. Bass Boost Control
Boost Filter (fs=48kHz)
100
DEM0
0
1
0
1
BST0
0
1
0
1
Frequency [Hz]
- 32 -
44.1kHz
48kHz
32kHz
Mode
OFF
Mode
MAX
OFF
MIN
MID
1000
(default)
(default)
10000
[AK4650]
2007/04