參數(shù)資料
型號： AK4370VN
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 24-Bit 2ch DAC with HP-AMP & Output Mixer
中文描述： 24位2通道DAC，具有惠普腺苷
文件頁數(shù)： 24/49頁
文件大小： 695K
代理商： AK4370VN
ASAHI KASEI
[AK4370]
MS0595-E-00
2007/03
- 24 -
■
Headphone Output (HPL, HPR pins)
The power supply voltage for the headphone-amp is supplied from the HVDD pin and is centered on the MUTET voltage.
The headphone-amp output load resistance is 16
Ω
(min). When the MUTEN bit is “1” at PMHPL=PMHPR= “1”, the
common voltage rises to 0.475 x AVDD. When the MUTEN bit is “0”, the common voltage of the headphone-amp falls
and the outputs (HPL and HPR pins) go to VSS1.
t
r
: Rise Time up to VCOM/2
t
f
: Fall Time down to VCOM/2
Table 12. Headphone-Amp Rise/Fall Time
[Example] : Capacitor between the MUTET pin and ground = 1
μ
F:
Rise time up to VCOM/2: t
r
= 70k x 1
μ
= 70ms (typ).
Fall time down to VCOM/2: t
f
= 60k x 1
μ
= 60ms (typ).
When the PMHPL and PMHPR bits are “0”, the headphone-amp is powered-down, and the outputs (HPL and HPR pins)
go to VSS1.
70k x C (typ)
60k x C (typ)
MUTEN bit
PMHPL/R bit
HPL/R pin
(1) (2)
(4)
(3)
t
r
t
f
VCOM/2
VCOM
Figure 18. Power-up/Power-down Timing for the Headphone-Amp
(1)
Headphone-amp power-up (PMHPL and PMHPR bits = “1”). The outputs are still at VSS1.
(2)
Headphone-amp common voltage rises up (MUTEN bit = “1”). Common voltage of the 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
= 70k 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 the headphone-amp is falling
to VSS1. This fall time depends on the capacitor value connected with the MUTET pin. The fall time down to
VCOM/2 is t
f
= 60k x C(typ) when the capacitor value on MUTET pin is “C”.
(4)
Headphone-amp power-down (PMHPL, PMHPR bits = “0”). The outputs are at VSS1. If the power supply is switched
off or the headphone-amp is powered-down before the common voltage goes to VSS1, some pop noise may occur.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4371 制造商:AKM 制造商全稱:AKM 功能描述:24bit DAC with Headphone Amplifier
AK4371VN 制造商:AKM 制造商全稱:AKM 功能描述:DAC with built-in PLL & HP-AMP
AK4372 制造商:AKM 制造商全稱:AKM 功能描述:DAC with built-in PLL & HP-AMP
AK4372ECB 制造商:AKM 制造商全稱:AKM 功能描述:DAC with built-in PLL & HP-AMP
AK4372VCB 制造商:AKM 制造商全稱:AKM 功能描述:DAC with built-in PLL & HP-AMP
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