參數(shù)資料
型號: AK4537VN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 16-Bit ツヒ Stereo CODEC with MIC/HP/SPK-AMP
中文描述: 16位ツヒ立體聲編解碼器與麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 29/76頁
文件大?。?/td> 576K
代理商: AK4537VN
ASAHI KASEI
[AK4537]
MS0202-E-04
2005/04
- 29 -
De-emphasis Filter
The AK4537 includes the digital de-emphasis filter (tc = 50/15
μ
s) by IIR filter. Setting the DEM1-0 bits enables the
de-emphasis filter (Table 16).
DEM1
DEM0
0
0
0
1
1
0
1
1
Table 16. De-emphasis Control
Bass Boost Function
The BST1-0 bits control the amount of low frequency boost applied to the DAC output signal (Table 17) . If the BST1-0
bits are set to “10” (MID Level), use a 47
μ
F capacitor for AC-coupling. If the boosted signal exceeds full scale, the analog
output clips to the full scale. Figure 10 shows the boost frequency response at –20dB signal input.
Mode
44.1kHz
OFF
48kHz
32kHz
Default
Figure 23. Boost Frequency (fs=44.1kHz)
BST1
0
0
1
1
BST0
0
1
0
1
Mode
OFF
MIN
MID
MAX
Default
Table 17. Low Frequency Boost Control
Boost Frequency (fs=44.1kHz)
-25
-20
-15
-10
-5
0
0.01
0.1
1
10
Frequency [kHz]
O
MIN
MID
MAX
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