參數(shù)資料
型號： AK4537VN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16-Bit ツヒ Stereo CODEC with MIC/HP/SPK-AMP
中文描述： 16位ツヒ立體聲編解碼器與麥克風/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù)： 32/76頁
文件大?。?/td> 576K
代理商： AK4537VN
ASAHI KASEI
[AK4537]
MS0202-E-04
2005/04
- 32 -
Headphone Output
Power supply voltage for the Headphone-amp is supplied from the HVDD pin and centered on the HVDD/2 voltage. The
Headphone output load resistance is min.20
. When the PMHPL and PMHPR bits are “0”, the common voltage of
Headphone-amp falls and the outputs (HPL and HPR pins) go to “L” (HVSS). When the PMHPL and PMHPR bits are
“1”, the common voltage rises to HVDD/2. A capacitor between the MUTET pin and ground reduces pop noise at
power-up.
[Example] : A capacitor between the MUTET pin and ground = 1.0
μ
F:
Rise/fall time constant:
τ
= 100ms(typ), 250ms(max)
Time until the common goes to HVSS when PMHPL/R bits = “1”
“0”: 500ms(max)
When HPL and HPR bits are “1”, the Headphone-amp is powered-down, and the outputs (HPL and HPR pins) go to “L”
(HVSS).
PMHPL/R bit
HPL/R bit
HPL/R pin
(1) (2)
(4)
(3)
Figure 26. Power-up/Power-down Timing for Headphone-amp
(1) Headphone-amp power-up (HPL, HPR bit= “0”). The outputs are still HVSS.
(2) Headphone-amp common voltage rise up (PMHPL, PMHPR 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 (PMHPL, PMHPR bit= “0”). Common voltage of Headphone-amp is
falling. 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 (HPL, HPR bit= “1”). 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.
相關PDF資料
PDF描述
AK4538 16Bit DS CODEC with MIC/HP/SPK-AMP
AK4538VN 16Bit DS CODEC with MIC/HP/SPK-AMP
AK4541VQ AC’97 Rev 2.1 Multimedia Audio CODEC
AK4541 AC’97 Rev 2.1 Multimedia Audio CODEC
AK4543 AC’97 Rev 2.1 Multimedia Audio CODEC
相關代理商/技術(shù)參數(shù)
參數(shù)描述
AK4537VNP-L 制造商:AKM Semiconductor Inc 功能描述:AK4537VNP-L
AK4538 制造商:AKM 制造商全稱:AKM 功能描述:16Bit DS CODEC with MIC/HP/SPK-AMP
AK4538VN 制造商:AKM 制造商全稱:AKM 功能描述:16Bit DS CODEC with MIC/HP/SPK-AMP
AK4541 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC
AK4541VQ 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC
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