參數(shù)資料
型號: AK4648EC
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): 71/119頁
文件大?。?/td> 1272K
代理商: AK4648EC
[AK4648]
MS0625-E-01
2007/06
- 71 -
When PMHPL and PMHPR bits are “0”, the Headphone-Amp is powered-down, and HPL and HPR pins go to “L”
(VSS2).
PMHPL bit,
PMHPR bit
(1) (2)
(4)
(3)
HPMTN bit
HPL pin,
HPR pin
Figure 52. Power-up/down sequence for Headphone-Amp (Single-ended Mode)
(1)
Headphone-Amp power-up (PMHPL, PMHPR bit = “1”). The outputs are still VSS2.
(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 VSS2. If the power supply is switched
off or Headphone-Amp is powered-down before the common voltage goes to VSS2, some POP noise occurs.
2. Pseudo Cap-less Mode (In case of using common buffer for Headphone-Amp)
HPL pin
HP-Amp
16
Ω
R
0.22
μ
F
10
Ω
HVCM pin
VCOM Amp for
HP-Amp
Headphone
HPR pin
HP-Amp
R
0.22
μ
F
10
Ω
16
Ω
Figure 53. External circuit example for Headphone-Amp (Pseudo Cap-less Mode)
When an external resistor R is smaller than 12
Ω
, put an oscillation prevention circuit (0.22
μ
F
±
20% capacitor and
10
Ω±
20% resistor) because it has the possibility that Headphone-Amp oscillates.
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