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參數(shù)資料
| 型號： | AK4343EN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Stereo DAC with HP/RCV/SPK-AMP |
| 中文描述： | 立體聲DAC惠普/垃圾車/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 58/98頁 |
| 文件大小： | 851K |
| 代理商： | AK4343EN |
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ASAHI KASEI
[AK4343]
MS0478-E-01
2006/10
- 58 -
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 50 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.
AK4343
HP-AMP
16
Headphone
10
0.22
μ
C
R
Figure 53. 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 50. External Circuit Example
Note 38. Output power at 16
load.
Note 39. 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 39)
62
(Note 39)
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 51. HP-Amp Common Voltage
1
0.64 x AVDD
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| AK4343VNP-L | 制造商:AKM Semiconductor Inc 功能描述:AK4343VNP-L |
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| AK4344ET | 制造商:AKM 制造商全稱:AKM 功能描述:100dB 96kHz 24-Bit Stereo 3.3V ΔΣ DAC |
| AK4345 | 制造商:AKM 制造商全稱:AKM 功能描述:100dB 96kHz 24-Bit Stereo 3.3V ツヒ DAC with DIT |
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