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AK4688EN Datasheet, PDF (19/36 Pages) Asahi Kasei Microsystems – Asynchronous Stereo CODEC with Capless Line I/O | |||
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[AK4688]
â Pre-Amp෦ͱà³à¾ATT
AK4688ã®å
¥åãã³(LIN/RIN)ã«å
¥åæµæ(Ri)ãLI/RI pinã¨LO/RO pinéã«å¸°éæµæ(Rf)ãã¤ãããã¨ã«ãããå
¥
åATTãæ§æã§ãã¾ã(Figure 8)ãLO/RO pinã«å
¥åå¯è½ãªé»å§ã¯typ. 1.91Vrms ã¾ã§ã§ããå¾ã£ã¦ãå
¥åãã³
(LIN/RIN)ã«ç´åã§å¤ä»ããããå
¥åæµæRiã®å
¥å端ã«å
¥åãããé»å§ã2Vrmsã4Vrmsã®ãããªé大æ¯å¹
ã«
対ãã¦ã¯ãRiã¨Rfã§é大æ¯å¹
ãtyp. 1.91Vrmsã¾ã§æ¸è¡°ãããå¿
è¦ãããã¾ããTable 19ã«Riã¨Rfã®å®æ°ä¾ã示
ãã¾ãã
Rf
LI
LO
Ri LIN
Pre-Amp
ã» å
¥åã¬ã³ã¸ã«å¯¾ããè¨å®ä¾
Figure 8. Pre-Amp and Input ATT
Input Range
4Vrms
2.2Vrms
1Vrms
Ri (kâ¦)
47
47
47
Rf (kâ¦)
20
39
82
ATT Gain (dB)
-7.42
-1.62
+4.83
LO/RO pin
1.70Vrms
1.82Vrms
1.74Vrms
ADC output (typ)
-1.0dBFS
-0.39dBFS
-0.78dBFS
Table 19. Input ATT example
MS1420-J-00
- 19 -
2012/05
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