參數(shù)資料
型號： AK4640
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16BIT CODEC WITH MIC /HP/SPK-AMPl
中文描述： 16位編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植，AMPl
文件頁數(shù)： 36/76頁
文件大?。?/td> 634K
代理商： AK4640
ASAHI KASEI
[AK4640]
MS0273-E-00
2004/03
- 36 -
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 click noise at
power-up.
[Example] : A capacitor between the MUTET pin and ground = 1.0
μ
F:
Time constant of rise/fall time:
τ
= 100ms(typ)
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 25. 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 rises 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(typ) x C when the capacitor value on MUTET pin is “C”.
(3)
Headphone-amp common voltage falls 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(typ) 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 click noise occurs. It takes 2times
of
τ
that the common voltage goes to GND.
相關(guān)PDF資料
PDF描述
AK4640VG 16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4640VN 16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4642EN Stereo CODEC with MIC/HP/SPK-AMP
AK4643EN Stereo CODEC with MIC/HP/RCV/SPK-AMP
AK4645EZ Stereo CODEC with MIC/HP-AMP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4640_05 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ツヒ CODEC with MIC/HP/SPK-AMP
AK4640VG 制造商:AKM 制造商全稱:AKM 功能描述:16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4640VN 制造商:AKM 制造商全稱:AKM 功能描述:16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4641 制造商:AKM 制造商全稱:AKM 功能描述:16 BIT CODEC WITH BLUETOOTH INTERFACE
AK4641EN 制造商:AKM 制造商全稱:AKM 功能描述:16bit stereo CODEC with built-in Microphone-amplifier and 16bit Mono CODEC for Bluetooth Interface.
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