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AK4414EQ Datasheet, PDF (46/51 Pages) Asahi Kasei Microsystems – High Performance 120dB 32-Bit 4ch DAC | |||
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Digital Ground
System
Controller
Analog Ground
1 PDN
2 BICK
3 SDATA1
4 SDATA2
5 TDM1
6 LRCK
7 SMUTE
8 SD
9 DEM0
10 DEM1
11 DIF0
[AK4414]
VSS1 33
VREFL1 32
VREFH1 31
AOUTR1N 30
AOUTR1P 29
NC
28
AOUTL2P 27
AOUTL2N 26
VREFH2 25
VREFL2 24
VSS2 23
Figure 25. Ground Layout
1. ã°ã©ã³ãã¨é»æºã®ãã«ãããªã³ã°
AK4413ã§ã¯ãã£ã¸ã¿ã«ãã¤ãºã®ã«ãããªã³ã°ãæå°éã«æãããããAVDD, VDD1/2 ã¨DVDDããã«ãããª
ã³ã°ãã¾ããAVDD, VDD1/2 ã«ã¯ã·ã¹ãã ã®ã¢ããã°é»æºãä¾çµ¦ããDVDDã«ã¯ã·ã¹ãã ã®ãã£ã¸ã¿ã«é»æºã
ä¾çµ¦ãã¦ä¸ãããAVDD, VDD1/2 ã¨DVDDã®é
ç·ã¯ã¬ã®ã¥ã¬ã¼ã¿çããã®ä½ã¤ã³ãã¼ãã³ã¹ç¶æ
ã®ã¾ã¾åãã¦
é
ç·ãã¦ä¸ããããã®éãAVDD, VDD1/2 ã¨DVDDã®ç«ã¡ä¸ãã·ã¼ã±ã³ã¹ãèæ
®ããå¿
è¦ã¯ããã¾ããã
VSS1-2, DVSS, AVSS ã¯åãã¢ããã°ã°ã©ã³ãã«æ¥ç¶ãã¦ä¸ããããã«ãããªã³ã°ã³ã³ãã³ãµã¯AK4413ã«ã§ã
ãã ãè¿ã¥ãã¦æ¥ç¶ãã¾ãã
2. åºæºé»å§
VREFH1/2 pinã¨VREFL1/2 pinã«å
¥åãããé»å§ã®å·®ãã¢ããã°åºåã®ãã«ã¹ã±ã¼ã«ã決å®ãã¾ããé常ã¯
VREFH1/2 pinãAVDDã«æ¥ç¶ããVREFL1/2 pinãVSS1/VSS2/AVSS ã«æ¥ç¶ãã¾ããVREFH1/2 pinã¨VREFL1/2
pinã¨ã®éã«é«å¨æ³¢ãã¤ãºãé¤å»ããããã«0.1µFã®ã»ã©ããã¯ã³ã³ãã³ãµãæ¥ç¶ãã¾ããã»ã©ããã¯ã³ã³ãã³
ãµã¯ãã³ã«ã§ããã ãè¿ã¥ãã¦æ¥ç¶ãã¦ä¸ãããVCM1/2 pinããé»æµãåã£ã¦ã¯ããã¾ããããã£ã¸ã¿ã«ä¿¡å·ã
ç¹ã«ã¯ããã¯ã¯AK4414ã¸ã®ã«ãããªã³ã°ãé¿ããããVREFH1/2, VREFL1/2 pinããã§ããã ãé¢ãã¦ä¸ã
ãã
3. ã¢ããã°åºå
ã¢ããã°åºåã¯å®å
¨å·®ååºåã«ãªã£ã¦ãããåºåã¬ã³ã¸ã¯AVDD/2ãä¸å¿ã«2.8Vpp (typ, VREFH1/2 â VREFL1/2
= 5V)ã§ããå·®ååºåã¯å¤é¨ã§å ç®ããã¾ããAOUT +, AOUT âã®å ç®é»å§ã¯VAOUT = (AOUT+)â(AOUTâ)ã§ãã
å ç®ã²ã¤ã³ãï¼ã®å ´åãåºåã¬ã³ã¸ã¯5.6Vpp (typ, VREFH1/2 â VREFL1/2 = 5V)ã§ããå¤é¨å ç®åè·¯ã®ãã¤ã¢
ã¹é»å§ã¯å¤é¨ã§ä¾çµ¦ãã¾ããå
¥åã³ã¼ãã®ãã©ã¼ãããã¯2âs compliment (2ã®è£æ°)ã§7FFFFFH(@24bit)ã«å¯¾ã
ã¦ã¯æ£ã®ãã«ã¹ã±ã¼ã«ã800000H(@24bit) ã«å¯¾ãã¦ã¯è² ã®ãã«ã¹ã±ã¼ã«ã000000H(@24bit)ã§ã®VAOUTã®çæ³å¤
ã¯0Vé»å§ãåºåããã¾ãã
å
èµã®ÎΣå¤èª¿å¨ã®å¸¯åå¤ãã¤ãº(ã·ã§ã¼ãã³ã°ãã¤ãº)ã¯å
èµã®ã¹ã¤ããããã£ãã·ã¿ãã£ã«ã¿(SCF)ã§æ¸è¡°ã
ãã¾ãã
Figure 26ã¯å·®ååºåã1åã®ãªãã¢ã³ãã§å ç®ããå¤é¨LPFåè·¯ä¾ã§ãã
Figure 27ã¯å·®ååºåã®åè·¯ä¾åã³3åã®ãªãã¢ã³ãã使ã£ãå¤é¨LPFåè·¯ä¾ã§ãã
MS1476-J-00
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2013/01
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