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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)： | 69/76頁 |
| 文件大?。?/td> | 634K |
| 代理商： | AK4640 |
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ASAHI KASEI
[AK4640]
MS0273-E-00
2004/03
- 69 -
Headphone-amp Output
FS2-0 bits
(Addr:05H, D7-5)
ATTL7-0 bits
(Addr:0CH 0DH, D7-0)
HPL/R bit
(Addr:03H, D1-0)
PMHPL/R bits
(Addr:01H, D2-1)
HPL/R pins
XXX
000
0000000
XXXXXXX
Normal Output
(1)
BST1-0 bits
(Addr:06H, D3-2)
00
XX
00
(2)
(3)
(10)
PMDAC bit
(Addr:01H, D0)
(4)
(9)
(5)
(7)
(6)
(8)
E xam ple :
X’tal and P LL are use d.
S am pling F reque ncy : 44.1kH z
D A T T C bit = “1”(default)
B ass B oost Level : M iddle
(1) A ddr:05H , D ata :00H
(3) A ddr:0C H , D ata 10H
(4) A ddr:01H , D ata 61H
P la yb ack
(2) A ddr:06H , D ata 19H
(7) A ddr:01H , D ata 61H
(8) A ddr:02H , D ata 83H
(5) A ddr:02H , D ata 80H
(6) A ddr:01H , D ata 67H
(9) A ddr:01H , D ata 60H
(10) A d dr:06H , D ata 1 1H
Figure 51. 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 : PMDAC bit = “0”
→
“1”
(5) Power up headphone-amp : HPL bit = HPR bit = “1”
→
“0”
Output voltage of headphone-amp is still HVSS.
(6) Rise up the common voltage of headphone-amp : 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(typ).
(7) Fall down the common voltage of headphone-amp : PMHPL bit = PMHPR bit = “1”
→
“0”
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
f
= 100ms(typ).
If the power supply is powered off or Headphone-Amp is powered-down before the common voltage goes to
GND, some click noise occurs. It takes 2times of
τ
f
that the common voltage goes to GND.
(8) Power down headphone-amp : HPL bit = HPR bit = “0”
→
“1”
(9) Power down DAC : PMDAC bit = “1”
→
“0”
(10) Off the low frequency boost level (BST1-0 bits = “00”)
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