參數(shù)資料
型號(hào): AK4642EN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP/SPK-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 48/83頁
文件大?。?/td> 670K
代理商: AK4642EN
ASAHI KASEI
[AK4642EN]
MS0420-E-00
2005/09
- 48 -
When BOOST=OFF, the cut-off frequency (fc) of Headphone-Amp depends on the external resistor and capacitor. This
fc can be shifted to lower frequency by using bass boost function. Table 39 shows the cut off frequency and the output
power for various resistor/capacitor combinations. The headphone impedance R
L
is 16
. Output powers are shown at
HVDD = 2.7, 3.0 and 3.3V. The output voltage of headphone is 0.6 x AVDD (Vpp).
When an external resistor R is smaller than 12
, put an oscillation prevention circuit (0.22
μ
F
±
20% capacitor and
10
±
20% resistor) because it has the possibility that Headphone-Amp oscillates.
AK4642
HP-AMP
16
Headphone
10
0.22
μ
R
C
Figure 32. External Circuit Example of Headphone
Output Power [mW]@0dBFS
HPG bit
R [
]
C [
μ
F]
fc [Hz]
BOOST=OFF
fc [Hz]
BOOST=MIN
@fs=44.1kHz
28
78
19
47
17
43
25
69
2.7V
3.0V
3.3V
100
47
100
47
220
100
22
10
70
149
50
106
45
100
62
137
6.8
10.1
12.5
15.1
0
16
5.1
6.3
7.7
0
33
41
50
1
100
0.9
1.1
1.3
Table 39. External Circuit Example
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