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AK4688EN Datasheet, PDF (16/36 Pages) Asahi Kasei Microsystems – Asynchronous Stereo CODEC with Capless Line I/O | |||
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[AK4688]
2. Auto Setting Mode (ACKS bit = â1â)
ACKS bit = â1âã§DACã¯Auto Setting Modeã«ãªãã¾ãããµã³ããªã³ã°ã¹ãã¼ãã¯MCLK2/LRCK2ã®æ¯ããèªå
çã«è¨å®ããã¾ã(Table 13, Table 14)ããã®ã¢ã¼ãã§ã¯DFS1-0 bits ã¯ç¡è¦ããã¾ãã
MCLK2
512fs, 768fs
256fs, 384fs
128fs, 192fs
DAC Sampling Speed (fs) LRCK2
Normal Speed Mode
32kHz~48kHz
Double Speed Mode
64kHz~96kHz
Quad Speed Mode
128kHz~192kHz
Table 13. PORT2(DAC) Sampling Speed (ACKS bit = â1â, Auto Setting Mode)
LRCK
fs
32.0kHz
44.1kHz
48.0kHz
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
176.4kHz
192.0kHz
128fs
-
-
-
-
-
22.5792
24.5760
192fs
-
-
-
-
-
33.8688
36.8640
MCLK (MHz)
256fs
384fs
512fs
-
-
-
8.192
11.2896
12.288
-
-
-
12.288
16.9344
18.432
16.3840
22.5792
24.5760
22.5792 33.8688
-
24.5760 36.8640
-
-
-
-
-
-
-
Table 14. ã·ã¹ãã ã¯ããã¯ä¾
768fs
24.5760
33.8688
36.8640
1152fs
36.8640
-
-
Sampling
Speed
Normal
Double
-
-
-
-
-
-
-
-
Quad
MCLK= 256fs/384fsã®ã¨ãã32kHz~96kHzã®ãµã³ããªã³ã°ã¬ã¼ãã¾ã§å¯¾å¿ãã¾ã(Table 15)ãã32kHz~48kHzã®
ãµã³ããªã³ã°ã¬ã¼ãã®ã¨ãã®DR, S/Nã¯MCLK= 512fs/768fsã®æã«æ¯ã¹ã¦å£åãã¾ãã
MCLK
DR, S/N
256fs/384fs
102dB
512fs/768fs
105dB
Table 15. MCLKå¨æ³¢æ°ã¨DR, S/Nã®é¢ä¿(fs = 48kHz)
â ÏÎΤϯÏÎγεÏÎϧλ
DACã¯IIRãã£ã«ã¿ã«ãããã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿ (50/15μs ç¹æ§) ãå
èµãã¦ãã¾ããå
¥åãã¼ã¿ã«å¯¾ãã¦
DEM bit = â1âãé¸æãããæããã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿ãæå¹ã«ãªãã¾ãããã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿ã
ONæã®ã²ã¤ã³ã¨ã©ã¼ã«ã¤ãã¦ã¯ããã£ã¸ã¿ã«ãã£ã«ã¿ç¹æ§ã®é
ç®ãåç
§ãã¦ä¸ãããDouble Speed Mode
(MCLK2=256fs/384fs), Quad Speed Mode (MCLK2=128fs/192fs)ã®ã¨ãããã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿ã¯ OFFã§ãã
è¨å®ã¯I2Cã³ã³ããã¼ã«ã¢ã¼ãã®ã¿ã§è¡ããDAC (DEM bit)ã«å¯¾ãã¦è¨å®ã§ãã¾ãã(Table 16)
DEM bit De-emphasis Filter
1
ON
0
OFF
(default)
Table 16. De-emphasis Control (Normal Speed Mode)
MS1420-J-00
- 16 -
2012/05
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