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參數(shù)資料
| 型號： | AK4683 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Asynchronous Multi-Channel Audio CODEC with DIR/T |
| 中文描述： | 異步多聲道音頻編解碼器署長/噸 |
| 文件頁數(shù)： | 43/82頁 |
| 文件大?。?/td> | 1257K |
| 代理商： | AK4683 |
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ASAHI KASEI
[AK4683]
MS0427-E-01
2005/11
- 43 -
Headphone Output
Power supply voltage for the Headphone-Amp is supplied from the HVDD pin and centered on the HVDD/2 voltage.
When the MUTEN bit is “0”, the common voltage of Headphone-Amp falls and the outputs (HPL and HPR pins) go to
“L” (HVSS). When the MUTEN bit is “1”, the common voltage rises to HVDD/2. A capacitor between the MUTET pin
and ground reduces click noise at power-up. Rise/Fall time constant is proportional to HVDD voltage and the capacitor
at MUTET pin.
[Example]: A capacitor between the MUTET pin and ground = 1.0
μ
F, HVDD=5V:
Rise/fall time constant:
τ
= 120ms(typ)
When PWPD bit is “0”, the Headphone-Amp is powered-down, and the outputs (HPL and HPR pins) go to “L”
(HVSS).
PWHP bit
(1) (2)
( )
( )
MUTEN bit
HPL pin,
HPR pin
(3)
Figure 25. Power-up/Power-down Timing for Headphone-Amp
(1) Headphone-Amp power-up (PWHP bit = “1”). The outputs are still HVSS.
(2) Headphone-Amp common voltage rises up (MUTEN bit = “1”). Common voltage of Headphone-Amp is rising.
(3) Start the audio output after finishing the setup pf common voltage to prevent the clipping.
(4) Headphone-Amp common voltage falls down (MUTEN bit = “0”). Common voltage of Headphone-Amp is falling.
(5) Headphone-Amp power-down (PWHP bit = “0”). The outputs are HVSS. If the power supply is switched off or
Headphone-Amp is powered-down before the common voltage goes to HVSS, some CLICK noise occurs.
The cut-off frequency (fc) of Headphone-Amp depends on the external resistor and capacitor. Table 41 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 = 5V.
AK4683
HP-AMP
16
Headphone
R
C
Figure 26. External Circuit Example of Headphone
R [
]
C [
μ
F]
fc [Hz]
Output Power [mW]@0dBFS
220
100
100
47
100
47
45
100
70
149
50
106
0
50
6.8
25
16
12.5
Table 41. External Circuit Example
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