參數(shù)資料
型號(hào)： AK4538VN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16Bit DS CODEC with MIC/HP/SPK-AMP
中文描述： 16位副編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù)： 65/70頁
文件大?。?/td> 485K
代理商： AK4538VN
ASAHI KASEI
[AK4538]
MS0198-E-01
2003/5
- 65 -
n
Headphone-amp Output
FS2-0 bits
(Addr:05H, D7-5)
(Addr:0CH 0DH, D7-0)
PMDAC bit
(Addr:01H, D0)
PMHPL/R bits
(Addr:01H, D2-1)
HPL/R pins
XXX
000
0000000
XXXXXXX
Normal Output
External Mute
(1)
BST1-0 bits
(Addr:06H, D3-2)
00
XX
00
(2)
(3)
(4)
(5)
(6)
(7)
(8)
E xam p le :
X ’tal and PLL are used.
S a m p ling Frequency : 44.1kH z
D A T T C b it = “1”(default)
D igital A ttenuato r Level : -8dB
B a s s B o o s t Level : M iddle
D e-emphases response : OFF
S o ft M ute Tim e : 1024/fs
(1) A d d r:05H, Data:00H
(3 ) A d d r:0C H , Data 10H
(4) A d d r:01H, Data 67H
(5) R e lease external M u te
P layback
(2) A d d r:06H, Data 19H
(6) E n a b le external M u te
(7) A d d r:01H, Data 60H
(8) A d d r:06H, Data 11H
Figure 54. Headphone-Amp Output Sequence
<Example>
At first, clocks should be supplied according to “Clock Set Up” sequence.
(1) Set up a sampling frequency (FS2-0 bits) if PLL mode is used.
(2) Set up the low frequency boost level(BST1-0 bits)
(3) Set up the digital volume(Addr : 0CH and 0DH)
At DATTC bit = “1”(default), ATTL7-0 bits of Address 0CH control both Lch and Rch attenuation level.
(4) Power up DAC and headphone-amp : PMDAC bit = PMHPL bit = PMHPR bit = “0”
→
“1”
The rising time after power up Headphone-amp depends on the capacitor value connected with the MUTET
pin. When this capacitor value is 1.0
μ
F, the time constant is
τ
r
= 100ms.
(5) Release the external mute.
(6) Enable the external mute.
(7) Power down DAC and headphone-amp : PMDAC bit = PMHPL bit = PMHPR bit = “1”
→
“0”
The falling time of Headphone-amp depends on the capacitor for the AC couple of Headphone-amp output.
When this capacitor value is 47
μ
F, the time constant is
τ
f
= 188ms. If the power supply is powered off or
Headphone-Amp is powered-up again before the common voltage goes to GND, some POP noise occurs. It
takes 5times of
τ
f
that the common voltage goes to GND.
(8) Off the low frequency boost level (BST1-0 bits = “00”)
相關(guān)PDF資料
PDF描述
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
AK4543VQ AC’97 Rev 2.1 Multimedia Audio CODEC
AK4544A AC97 MULTIMEDIA AUDIO CODEC WITH SRC
相關(guān)代理商/技術(shù)參數(shù)
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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
AK4543 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC
AK4543VQ 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC
AK4544 制造商:AKM 制造商全稱:AKM 功能描述:AC97 MULTIMEDIA AUDIO CODEC WITH SRC
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