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參數(shù)資料
| 型號： | AK4650VG |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
| 中文描述： | 16位ツヒ編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 39/86頁 |
| 文件大小： | 824K |
| 代理商： | AK4650VG |
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[AK4650]
MS0502-E-01
2007/04
- 39 -
■
Headphone Output
Power supply voltage for the Headphone-amp is supplied from the HVDD pin and centered on the MUTET voltage. The
Headphone-amp output load resistance is min.16
Ω
. When the HPMT bit is “1” at PMHPL=PMHPR= “1”, the common
voltage rises to 0.44 x AVDD. When the HPMT bit is “1”, the common voltage of Headphone-amp falls and the outputs
(HPL and HPR pins) go to HVSS.
A capacitor between the MUTET pin and ground reduces pop noise at power-up/down. It is
recommended that the capacitor with small variation of capacitance and low ESR (Equivalent Series
Resistance) over all temperature range, since the rise and fall time in Table 32 depend on the
capacitance and ESR of the external capacitor at MUTET pin.
t
r
: Rise Time up to 0.44 x AVDD
t
f
: Fall Time down to 0V
Table 32. Headphone-Amp Rise/Fall Time
[Example]: A capacitor between the MUTET pin and ground = 1.0
μ
F:
Rise Time up to 0.44 x AVDD: t
r
= 100k
Ω
x 1
μ
F = 100ms(typ)
Fall Time down to 0V: t
f
= 200k
Ω
x 1
μ
F = 200ms(typ)
When PMHPL and PMHPR bits are “0”, the Headphone-amp is powered-down, and the outputs (HPL and HPR pins) go
to HVSS.
100k x C (typ)
200k x C (typ)
HPMT bit
PMHPL/R bit
HPL/R pin
(1) (2)
(4)
(3)
t
r
t
f
0.22 x AVDD
0.44 x AVDD
Figure 26. Power-up/Power-down Timing for Headphone-amp
(1)
Headphone-amp power-up (PMHPL and PMHPR bits = “1”). The outputs are still HVSS.
(2)
Headphone-amp common voltage rises up (HPMT bit = “0”). Common voltage of Headphone-amp is rising. This rise
time depends on the capacitor value connected with the MUTET pin. The rise time up to 0.44 x AVDD is t
r
= 100k x
C(typ) when the capacitor value on MUTET pin is “C”.
(3)
Headphone-amp common voltage falls down (HPMT bit = “1”). Common voltage of Headphone-amp is falling to
HVSS. This fall time depends on the capacitor value connected with the MUTET pin. The fall time down to 0V is t
f
=
200k x C(typ) when the capacitor value on MUTET pin is “C”.
(4)
Headphone-amp power-down (PMHPL, PMHPR bits = “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.
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| AK4651VG | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4651 | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4651VG | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4664VQ | 功能描述:IC CODEC STEREO 20BIT LQFP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時間 標(biāo)準(zhǔn)包裝:1,000 |
| AK4665A | 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP |
| AK4665AEN | 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP |
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