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AK4688EN Datasheet, PDF (22/36 Pages) Asahi Kasei Microsystems – Asynchronous Stereo CODEC with Capless Line I/O | |||
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[AK4688]
â ÏÏ«ÊÎοÏɾμ΢ϯػೳ
AK4688ã®ADCãããã¯ã¯ãã¯ã¼ãã¦ã³ãã³(PDN1 pin)ã âLâ ã«ãããã¨ã§ãDACãããã¯ã¯ãã¯ã¼ãã¦ã³ã
ã³(PDN2 pin)ã âLâ ã«ãããã¨ã§ãã¯ã¼ãã¦ã³ã§ãããã®ã¨ãåæã«åãã£ã¸ã¿ã«ãã£ã«ã¿ããªã»ãããã
ã¾ããPDN1 pin = PDN2 pin = âLâã§å
é¨ã¬ã¸ã¹ã¿å¤ã¯åæåããã¾ãããã¯ã¼ãã¦ã³ã¢ã¼ãæãã¢ããã°åºå
ã¯0VãSDTO pin㯠âLâ ã«ãªãã¾ãããã®ãªã»ããã¯é»æºæå
¥æã«å¿
ãä¸åº¦è¡ã£ã¦ä¸ããã
ADCã¯ãã¹ã¿ã¢ã¼ãã§ä½¿ç¨ããå ´åãPDN1 pin: âLâââHâã§ãã¯ã¼ãã¦ã³ã解é¤ãããå¾ãMCLK1ã® âââ ã«
åæãã¦å
é¨åè·¯ããã¯ã¼ã¢ããããå
é¨ã®ã¿ã¤ãã³ã°ãåä½ãã¾ããã¹ã¬ã¼ãã¢ã¼ãã§ä½¿ç¨ããå ´åãPDN1
pin: âLâââHâã§ãã¯ã¼ãã¦ã³ã解é¤ãããå¾ãMCLK1, LRCK1, BICK1å
¥åå¾ã®LRCK1ã® âââ ã«åæãã¦å
é¨
åè·¯ããã¯ã¼ã¢ããããå
é¨ã®ã¿ã¤ãã³ã°ãåä½ãã¾ãã
DACã¯PDN2 pin: âLââ âHâã§ãã¯ã¼ãã¦ã³ã解é¤ãããå¾ãMCLK2, LRCK2, BICK2å
¥åå¾ã®LRCK2ã® âââ ã«
åæãã¦å
é¨åè·¯ããã¯ã¼ã¢ããããå
é¨ã®ã¿ã¤ãã³ã°ãåä½ãã¾ãã
ADCã®åæåãµã¤ã¯ã«ã¯ããã¯ã¼ãã¦ã³ã¢ã¼ãã解é¤ãããã¨éå§ããã¾ãããã®ãããåºåãã¼ã¿ã¯2640
ãµã¤ã¯ã«å¾ç¢ºå®ãã¾ããDACã®åæåãµã¤ã¯ã«ãããã¯ã¼ãã¦ã³ã¢ã¼ãã解é¤ãããã¨éå§ããã¾ããåæ
åä¸ã®ã¢ããã°åºåã¯0Vã§ããFigure 11ã«ADC, DACåæã«ãã¯ã¼ãã¦ã³åã³ãã¯ã¼ã¢ããããæã®ã·ã¼ã±
ã³ã¹ä¾ã示ãã¾ãã
ADCã¨DACã¯PWAD bitã¨PWDA bitã§ãããããç¬ç«ã«ãã¯ã¼ãã¦ã³ã§ãã¾ãããã®ã¨ãã¬ã¸ã¹ã¿å¤ã¯åæ
åããã¾ãããPWAD bit = â0âã®ã¨ãADCã®åºåãã¼ã¿ã¯ âLâ ã«ãªãã¾ããPWDA bit = â0âã®ã¨ããã¢ããã°
åºåã¯0Vã«ãªãã¾ãã
Power
PDN1 pin =
PDN2 pin
CVEE pin
VREFpin
(1)
(2)
0V
0V
ADC Internal
State
DAC Internal
State
ADC In
(Analog)
ADC Out
(Digital)
DAC In
(Digital)
(9)
â0âdata (6)
â0âdata
DAC Out
(Internal Status)
Clock In
Donât care
MCLK1,LRCK1,BICK1
MCLK2,LRCK2,BICK2
CVEE
80% AVDD2
(8)
timeA (3)
Init Cycle
timeB (4)
Normal Operation
Normal Operation
(5)
GD
0V
(7)
Power-down
Power-down
GD
(5)
GD
â0âdata
â0âdata
GD
Donât care
Figure 11. Power-up/down Sequence Example
MS1420-J-00
- 22 -
2012/05
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