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參數(shù)資料
| 型號： | AK4368EG |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | DAC with built-in PLL & HP-AMP |
| 中文描述： | DAC，帶有內置的鎖相環(huán) |
| 文件頁數(shù)： | 30/60頁 |
| 文件大?。?/td> | 817K |
| 代理商： | AK4368EG |
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ASAHI KASEI
[AK4368EG]
MS0529-E-00
2006/07
- 30 -
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
(min). When the MUTEN bit is “1” at PMHPL=PMHPR= “1”, the
common voltage rises to 0.475 x HVDD. When the MUTEN bit is “0”, the common voltage of the headphone-amp falls
and the outputs (HPL and HPR pins) go to HVSS.
t
r
: Rise Time up to VCOM/2
t
f
: Fall Time down to VCOM/2
Table 22. 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 HVSS.
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 21. Power-up/Power-down Timing for the Headphone-Amp
(1) Headphone-amp power-up (PMHPL and PMHPR bits = “1”). The outputs are still at HVSS.
(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 HVSS. 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 HVSS. If the power supply is
switched off or the headphone-amp is powered-down before the common voltage goes to HVSS, some pop noise may
occur.
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