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參數(shù)資料
| 型號(hào)： | AK4366 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Low Power 24-Bit 2ch DAC with HP-AMP |
| 中文描述： | 低功耗24位2通道DAC，具有惠普腺苷 |
| 文件頁數(shù)： | 19/31頁 |
| 文件大?。?/td> | 266K |
| 代理商： | AK4366 |
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ASAHI KASEI
AKM CONFIDENTIAL
[AK4366]
REV 0.6
2003/3
- 19 -
n
Headphone Output
Power supply voltage for the Headphone-amp is supplied from the HVDD pin and centered on the 0.45 x VDD voltage.
The Headphone-amp output load resistance is min.16
.
1) Parallel mode (P/S= “H”)
When MUTEN pin is set to “H” at PDN= “H”, common voltage goes to 0.45 x VDD. When MUTEN pin is set to “L”,
common voltage goes to VSS, and the outputs (HPL and HPR pins) are VSS. When PDN pin is “L”, headphone amplifiers
are powered-down perfectly, and the outputs (HPL and HPR pins) are VSS.
2) Serial mode (P/S= “L”)
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. When PMHPL and
PMHPR bits are “0”, the Headphone-amps are powered-down perfectly, and the outputs (HPL and HPR pins) are VSS.
A capacitor between the MUTET pin and ground reduces pop noise at power-up/down.
[Example] : A capacitor between the MUTET pin and ground = 1.0
μ
F:
Time constant of rise/fall time:
τ
= 100ms
MUTEN bit
PMHPL/R bit
HPL/R pin
(1) (2)
(4)
(3)
Figure 14. 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 rise 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 time constant is
τ
= 100k x C when the
capacitor value on MUTET pin is “C”.
(3)
Headphone-amp common voltage fall 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 time constant is
τ
= 100k x C
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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