AK4642VN Datasheet, PDF (43/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
„ ιϑτϛϡʔτػೳ
DACೖྗͷσΟδλϧ෦ʹιϑτϛϡʔτػೳΛ಺ଂ͠·͢ɻιϑτϛϡʔτ͸SMUTE bitͰίϯτϩʔϧ
Ͱ͖·͢ɻSMUTE bitΛ “1”ʹ͢ΔͱDVTM bitͰઃఆͨ͠αΠΫϧͰೖྗσʔλ͕−∞(“0”)·ͰΞςωʔγϣ
ϯ͞Ε·͢ɻSMUTE bitΛ “0”ʹ͢Δͱ−∞ঢ়ଶ͕ղআ͞Εɺ−∞͔ΒDVTM bitͰઃఆͨ͠αΠΫϧͰɺDVL/R7-0
bitsͰઃఆͨ͠ϘϦϡʔϜ஋·Ͱ෮͢·͠ؼɻιϑτϛϡʔτ։࢝ޙɺDVTM bitͰઃఆͨ͠αΠΫϧҎ಺ʹ
ղআ͞ΕΔͱΞςωʔγϣϯ͕தஅ͞Εɺಉ͡αΠΫϧͰɺDVL/R7-0 bitsͰઃఆͨ͠ϘϦϡʔϜ஋·Ͱ෮ؼ
͠·͢(Figure 27)ɻ
SMUTE bit
DVL/R7-0 bits
A tte n u a tio n
DVTM bit
(1)
DVTM bit
(3)
-∞
GD
GD
(2)
Analog O utput
Figure 27. ιϑτϛϡʔτػೳ
(1) DVTM bitͰઃఆͨ͠αΠΫϧͰೖྗσʔλ͕−∞(“0”)·ͰΞςωʔγϣϯ͞Ε·͢ɻ
(2) σΟδλϧೖྗʹର͢ΔΞφϩάग़ྗ͸܈஗Ԇ(GD)Λ࣋ͪ·͢ɻ
(3) ιϑτϛϡʔτ։࢝ޙɺDVTM bitͰઃఆͨ͠αΠΫϧҎ಺ʹղআ͞ΕΔͱΞςωʔγϣϯ͕தஅ͞Εɺ
ಉ͡αΠΫϧͰɺDVL/R7-0 bitsͰઃఆͨ͠ϘϦϡʔϜ஋·Ͱ෮͢·͠ؼɻ
MS0358-J-02
- 43 -
2005/04