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參數(shù)資料
| 型號： | AK4647 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with MIC/HP-AMP |
| 中文描述： | 立體聲編解碼器麥克風(fēng)/惠普腺苷 |
| 文件頁數(shù)： | 44/72頁 |
| 文件大?。?/td> | 565K |
| 代理商： | AK4647 |
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ASAHI KASEI
[AK4647]
MS0566-E-00
2006/11
- 44 -
Headphone Output
Power supply voltage for the Headphone-Amp is supplied from the HVDD pin and centered on the HVDD/2 voltage. The
load resistance and output voltage are specified by HVDD voltage. HPG bit selects the output voltage (see Table 39).
HVDD
2.6
～
5.25V
HPG bit
0
Output Voltage [Vpp]
0.6 x AVDD
Load Resistance (min)
22
Ω
Table 39. Headphone-Amp Output Voltage and Load Resistance
When the HPMTN bit is “0”, the common voltage of Headphone-Amp falls and the outputs (HPL and HPR pins) go to
“L” (HVSS). When the HPMTN bit is “1”, the common voltage rises to HVDD/2. A capacitor between the MUTET pin
and ground reduces pop noise at power-up. Rise/Fall time constant is in proportional to HVDD voltage and the capacitor
at MUTET pin.
[Example]: A capacitor between the MUTET pin and ground = 1.0
μ
F, HVDD=3.3V:
Rise/fall time constant:
τ
= 100ms(typ), 250ms(max)
Time until the common goes to HVSS when HPMTN bit = “1”
“0”: 500ms(max)
When PMHPL and PMHPR bits are “0”, the Headphone-Amp is powered-down, and the outputs (HPL and HPR pins) go
to “L” (HVSS).
PMHPL bit,
PMHPR bit
4.0
～
5.25V
1
0.91 x AVDD
100
Ω
(1) (2)
(4)
(3)
HPMTN bit
HPL pin,
HPR pin
Figure 33. Power-up/Power-down Timing for Headphone-Amp
(1) Headphone-Amp power-up (PMHPL, PMHPR bit = “1”). The outputs are still HVSS.
(2) Headphone-Amp common voltage rises up (HPMTN bit = “1”). Common voltage of Headphone-Amp is rising.
(3) Headphone-Amp common voltage falls down (HPMTN bit = “0”). Common voltage of Headphone-Amp is falling.
(4) Headphone-Amp power-down (PMHPL, PMHPR 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 POP noise occurs.
相關(guān)PDF資料 |
PDF描述 |
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| AK4647VN | Stereo CODEC with MIC/HP-AMP |
| AK4648 | Stereo CODEC with MIC/HP/SPK-AMP |
| AK4648EC | Stereo CODEC with MIC/HP/SPK-AMP |
| AK4650 | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
| AK4650VG | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4647VN | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP |
| AK4647VQ | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP |
| AK4648 | 制造商:AKM 制造商全稱:AKM 功能描述:stereo CODEC with MIC/HP/SPK amplifier |
| AK4648EC | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/SPK-AMP |
| AK4649 | 制造商:AKM 制造商全稱:AKM 功能描述:24bit Stereo CODEC with MIC/SPK-AMP |
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