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AK4645AEZ Datasheet, PDF (77/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP
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[AK4645A]
1. άϥϯυͱిݯͷσΧοϓϦϯά
ͱݯిάϥϯυͷऔΓํʹ͸े෼஫ҙͯ͠Լ͍͞ɻ௨ৗɺAVDD, DVDD, TVDD, HVDDʹ͸γεςϜͷΞφ
ϩάిݯΛ͢·͠څڙɻAVDD, DVDD, TVDD, HVDD͕ผి͞څڙͰݯΕΔ৔߹ʹ͸ɺి্ཱ͛ͪݯγʔέ
ϯεΛߟ͑Δඞཁ͸͋Γ·ͤΜɻͨͩ͠ɺPDN pin = “L”ͷঢ়ଶͰ֤ిݯΛ্ཱ͍ͪ͛ͯͩ͘͞ɻ͢΂ͯͷి
ޙ্ཱ͕͕ͨͬͪݯɺPDN pinΛ “H”ʹ͍ͯͩ͘͠͞ɻ
·ͨɺి্ཱ͛ͪݯɺཱͪԼ͛࣌ͷϔουϑΥϯग़ྗ͓ΑͼϥΠϯग़ྗͷϙοϓϊΠζΛճආ͢Δʹ͸ɺ࣍
ͷਪ঑γʔέϯεΛࢀরͯ͠ಈ࡞͍ͤͯͩ͘͞͞ɻ
1) ্ཱ࣌͛ͪݯి
ɾPDN pin = “L”ͷঢ়ଶͰ֤ిݯΛ্ཱͪ͛ɺ͢΂ͯͷి্ཱ͔͕͕ͯͬͪݯΒPDN pin = “L”ͷঢ়ଶΛ150ns
Ҏ্อ࣋ͨ͠ޙɺPDN pin = “H”ʹͯ͠ϦηοτΛղআ͍ͯͩ͘͠͞ɻ
ɾి͕ݯෳ਺ʹ෼͔Ε͍ͯΔ৔߹͸ɺTVDDΛؚΉిݯΛ࠷ॳʹ্ཱ͍ͪ͛ͯͩ͘͞ɻ·ͨɺDVDDͱ
HVDDͷؔ܎ʹ͍ͭͯ͸ɺDVDDΛؚΉిݯΛઌʹ্ཱ͍ͪ͛ͯͩ͘͞ɻ
2) ཱͪݯిԼ͛࣌
ɾPDN pin = “L”ͱͨ͠ঢ়ଶͰ֤ిݯΛཱͪԼ͍͛ͯͩ͘͞ɻ
ɾి͕ݯෳ਺ʹ෼͔Ε͍ͯΔ৔߹͸ɺTVDDΛؚΉిݯΛ࠷ཱͪʹޙԼ͍͛ͯͩ͘͞ɻ·ͨɺDVDDͱ
HVDDͷؔ܎ʹ͍ͭͯ͸ɺDVDDΛؚΉిݯΛཱͪʹޙԼ͍͛ͯͩ͘͞ɻ
AVSS, HVSS͸Ξφϩάάϥϯυʹ઀ଓͯ͠Լ͍͞ɻγεςϜͷάϥϯυ͸ΞφϩάͱσΟδλϧͰ෼͚ͯ
഑ઢ͠PCϘʔυ্ͷి͜ͱ͍ۙʹݯΖͰ઀ଓͯ͠Լ͍͞ɻখ༰ྔͷσΧοϓϦϯάίϯσϯα͸ͳΔ΂͘ి
ݯϐϯͷۙ͘ʹ઀ଓͯ͠Լ͍͞ɻ
2. ج४ిѹ
VCOM͸Ξφϩά৴߸ͷίϞϯిѹͱͯ͠࢖ΘΕ·͢ɻ͜ͷϐϯʹ͸ߴप೾ϊΠζΛআ͢ڈΔͨΊʹ2.2μF
ఔ౓ͷిղίϯσϯαͱฒྻʹ0.1μFͷηϥϛοΫίϯσϯαΛAVSSͱͷؒʹ઀ଓͯ͠Լ͍͞ɻಛʹɺηϥ
ϛοΫίϯσϯα͸ϐϯʹͰ͖Δ͚͚ͩۙͮͯ઀ଓͯ͠Լ͍͞ɻVCOM pin͔ΒిྲྀΛऔͬͯ͸͍͚·ͤΜɻ
σΟδλϧ৴߸ɺಛʹΫϩοΫ͸มௐ΁ثͷΧοϓϦϯάΛආ͚ΔͨΊɺVCOM pin͔ΒͰ͖Δ͚ͩ཭ͯ͠
Լ͍͞ɻ
3. Ξφϩάೖྗ
ϚΠΫೖྗɺϥΠϯೖྗͱMINೖྗ͸γϯάϧΤϯυೖྗʹͳ͍ͬͯ·͢ɻϚΠΫೖྗͱϥΠϯೖྗͷೖྗ
Ϩϯδ͸಺෦ͷίϞϯిѹ(0.45 x AVDD)Λத৺ʹ0.06 x AVDD Vpp(typ)@MGAIN1-0 bits = “01”, 0.03 x AVDD
Vpp(typ)@MGAIN1-0 bits = “10”, 0.015 x AVDD Vpp(typ)@MGAIN1-0 bits = “11”·ͨ͸ɺ0.6 x AVDD
Vpp(typ)@MGAIN1-0 bits = “00”ʹͳΓ·͢ɻMINೖྗͷೖྗϨϯδ͸಺෦ͷίϞϯిѹ(0.45 x AVDD)Λத৺
ʹ0.6 x AVDD Vpp(typ)ʹͳΓ·͢ɻ௨ৗɺೖྗ৴߸͸ίϯσϯαͰDCΧοτ͠·͢ɻ͜ͷ࣌ΧοτΦϑप
೾਺͸fc=1/(2πRC)Ͱ͢ɻAK4645A͸AVSS͔ΒAVDD·ͰͷిѹΛೖྗ͢Δ͜ͱ͕Ͱ͖·͢ɻ
4. Ξφϩάग़ྗ
DACʹର͢ΔೖྗσʔλͷϑΥʔϚοτ͸2’sίϯϓϦϝϯτͰɺ7FFFH(@16bit)ʹରͯ͠͸ਖ਼ͷϑϧεέʔ
ϧɺ8000H(@16bit)ʹରͯ͠͸ෛͷϑϧεέʔϧɺ0000H(@16bit)Ͱͷཧ࿦஋͸VCOMిѹͰ͢ɻVCOMిѹ
͸ɺεςϨΦϥΠϯग़ྗͰ͸0.45 x AVDD (typ)Λத৺ʹग़ྗ͞ΕɺϔουϑΥϯग़ྗͰ͸HVDD/2Λத৺ʹ
ग़ྗ͞Ε·͢ɻ
MS0986-J-00
- 77 -
2008/07
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