參數(shù)資料
型號: AK4643EN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP/RCV/SPK-AMP
中文描述: 立體聲編解碼器麥克風/惠普/垃圾車/胰腎聯(lián)合移植腺苷
文件頁數(shù): 62/104頁
文件大?。?/td> 926K
代理商: AK4643EN
ASAHI KASEI
[AK4643]
MS0476-E-01
2006/10
- 62 -
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 54 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.
AK4643
HP-AMP
16
Headphone
10
0.22
μ
C
R
Figure 56. 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
17
43
28
78
19
47
17
43
25
69
HVDD=3.0V
AVDD=3.0V
HVDD=3.3V
AVDD=3.3V
HVDD=5V
AVDD=3.3V
220
100
100
47
100
47
220
100
22
10
45
100
70
149
50
106
45
100
62
137
Table 54. External Circuit Example
Note 45. Output power at 16
load.
Note 46. Output signal is clipped.
0
25.3
30.6
30.6
6.8
12.5
15.1
15.1
0
16
6.3
7.7
7.7
0
51
(Note 46)
62
(Note 46)
70
1
100
1.1
1.3
1.3
<Headphone-Amp PSRR>
When HVDD is directly supplied from the battery in the mobile phone system, RF noise may influences headphone
output performance. When VBAT bit is set to “1”, HP-Amp PSRR for the noise applied to HVDD is improved. In this
case, HP-Amp common voltage is 0.64 x AVDD (typ). When AVDD is 3.3V, common voltage is 2.1V. Therefore, when
HVDD voltage becomes lower than 4.2V, the output signal will be clipped easily.
VBAT bit
0
Common Voltage [V]
0.5 x HVDD
Table 55. HP-Amp Common Voltage
1
0.64 x AVDD
相關PDF資料
PDF描述
AK4645EZ Stereo CODEC with MIC/HP-AMP
AK4645 Stereo CODEC with MIC/HP-AMP
AK4646EZ Stereo CODEC with MIC/SPK-AMP
AK4646 Stereo CODEC with MIC/SPK-AMP
AK4646EN Stereo CODEC with MIC/SPK-AMP
相關代理商/技術參數(shù)
參數(shù)描述
AK4644 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with built-in MIC/HP/RCV amplifier
AK4644EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/RCV-AMP
AK4645 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP
AK4645EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP
AK4645ENP-L 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: