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參數(shù)資料
| 型號： | AK4367VN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Low Power 24-Bit 2ch DAC with HP-AMP & Output Mixer |
| 中文描述： | 低功耗24位2通道DAC，具有惠普腺苷 |
| 文件頁數(shù)： | 19/38頁 |
| 文件大?。?/td> | 455K |
| 代理商： | AK4367VN |
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ASAHI KASEI
[AK4367]
MS0247-E-02
2005/10
- 19 -
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
. When the MUTEN bit is “1” at PMHPL=PMHPR= “1”, the common
voltage rises to 0.45 x VDD. When the MUTEN bit is “0”, the common voltage of Headphone-amp falls and the outputs
(HPL and HPR pins) go to VSS.
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 9 depend on the
capacitance and ESR of the external capacitor at MUTET pin.
In case only one path is connected,
DAC or LIN/RIN/MIN.
t
r
: Rise Time up to VCOM/2
100k x C (typ)
t
f
: Fall Time down to 0V
200k x C (typ)
Table 9. Headphone-Amp Rise/Fall Time
[Example] : A capacitor between the MUTET pin and ground = 1.0
μ
F, and only DAC path is connected:
Time constant of rise time: t
r
= 100k
x 1
μ
F = 100ms(typ)
Time constant of fall time: t
f
= 200k
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 VSS.
In case both paths are connected,
DAC and LIN/RIN/MIN.
120k x C (typ)
150k x C (typ)
MUTEN bit
PMHPL/R bit
HPL/R pin
(1) (2)
(4)
(3)
t
r
t
f
VCOM/2
VCOM
Figure 15. Power-up/Power-down Timing for Headphone-amp
(1) Headphone-amp power-up (PMHPL and PMHPR bits = “1”). The outputs are still VSS.
(2) Headphone-amp common voltage rises up (MUTEN bit = “1”). 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 VCOM/2 is t
r
= 100k x
C(typ) when the capacitor value on MUTET pin is “C”.
(3)
Headphone-amp common voltage falls down (MUTEN bit = “0”). Common voltage of Headphone-amp is falling to
VSS. 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 VSS. If the power supply is switched off
or Headphone-amp is powered-down before the common voltage goes to VSS, some pop noise occurs.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4367VNP-L | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: |
| AK4368 | 制造商:AKM 制造商全稱:AKM 功能描述:PLL & HP-AMP DAC |
| AK4368192D | 制造商:ACCUTEK 制造商全稱:ACCUTEK MICROCIRCUIT CORPORATION 功能描述:65,536 x 32 Bit CMOS/BiCMOS Static Random Access Memory |
| AK4368192G | 制造商:ACCUTEK 制造商全稱:ACCUTEK MICROCIRCUIT CORPORATION 功能描述:65,536 x 32 Bit CMOS/BiCMOS Static Random Access Memory |
| AK4368192S | 制造商:ACCUTEK 制造商全稱:ACCUTEK MICROCIRCUIT CORPORATION 功能描述:65,536 x 32 Bit CMOS/BiCMOS Static Random Access Memory |
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