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AK4368 Datasheet, PDF (55/58 Pages) Asahi Kasei Microsystems – PLL & HP-AMP DAC
ASAHI KASEI
[AK4368]
1. άϥϯυͱిݯͷσΧοϓϦϯά
ͱݯిάϥϯυͷऔΓํʹ͸े෼஫ҙͯ͠Լ͍͞ɻ௨ৗɺAVDD, PVDD, HVDD͸γεςϜͷΞφϩάిݯɺ
DVDDʹ͸AVDD͔Β10ΩͷγϦʔζ఍߅Λ௨ͨ͠γεςϜͷΞφϩάిݯΛ͢·͠څڙɻAVDDͱDVDD͕
ผి͞څڙͰݯΕΔ৔߹Ͱ΋ɺి্ཱ͛ͪݯγʔέϯεΛߟྀ͢Δඞཁ͸͋Γ·ͤΜɻAVDDͱHVDDΛผ
͢څڙͰݯిΔ৔߹ɺAVDD͸HVDDͱಉ࣌·ͨ͸ઌʹ্ཱͪ͛ͯԼ͍͞ɻ·ͨɺిݯOFF࣌͸ɺHVDDͱಉ
࣌·ͨ͸ཱͪʹޙԼ͛ͯԼ͍͞ɻPVDD͸ి্ཱ͛ͪݯγʔέϯεΛߟྀ͢Δඞཁ͸͋Γ·ͤΜɻAVSS,
DVSS, PVSS, HVSS͸γεςϜͷΞφϩάάϥϯυʹ઀ଓͯ͠Լ͍͞ɻγεςϜͷάϥϯυ͸ΞφϩάͱσΟ
δλϧͰ෼͚ͯ഑ઢ͠ɺPCϘʔυ্ͷి͜ͱ͍ۙʹݯΖͰ઀ଓͯ͠Լ͍͞ɻখ༰ྔͷσΧοϓϦϯάίϯσ
ϯα͸ͳΔ΂͘ిݯϐϯͷۙ͘ʹ઀ଓͯ͠Լ͍͞ɻ
2. ج४ిѹ
AVDDʹೖྗ͞ΕΔిѹ͕Ξφϩάग़ྗϨϯδΛઃఆ͠·͢ɻ௨ৗAVDD͸AVSSͱͷؒʹ0.1µFͷηϥϛο
ΫίϯσϯαΛ઀ଓ͠·͢ɻVCOM͸0.475 x AVDDిѹ(typ)Λग़ྗ͓ͯ͠ΓɺΞφϩά৴߸ͷίϞϯిѹͱ
ͯ͠࢖ΘΕ·͢ɻ͜ͷϐϯʹ΋ߴप೾ϊΠζΛআ͢ڈΔͨΊʹ2.2µFఔ౓ͷిղίϯσϯαΛAVSSͱͷؒʹ
઀ଓͯ͠Լ͍͞ɻ·ͨɺVCOM pin͔ΒిྲྀΛͱͬͯ͸͍͚·ͤΜɻσΟδλϧ৴߸ɺಛʹΫϩοΫ͸มௐث
΁ͷΧοϓϦϯάΛආ͚ΔͨΊɺAVDD pin͓ΑͼVCOM pin͔ΒͰ͖Δ͚ͩ཭ͯ͠Լ͍͞ɻ
3. Ξφϩάग़ྗ
DACग़ྗ͸γϯάϧΤϯυʹͳ͓ͬͯΓɺग़ྗϨϯδ͸VCOMిѹΛத৺ʹɺϔουϑΥϯͷग़ྗϨϯδ͸
VCOMిѹΛத৺ʹ0.47xAVDD(typ)@−3dBFSɺLOUT/ROUTͷग़ྗϨϯδ͸VCOMిѹΛத৺ʹ
0.61xAVDD(typ)@0dBFSͰ͢ɻೖྗίʔυͷϑΥʔϚοτ͸ 2’sίϯϓϦϝϯτ(2ͷิ਺)Ͱɺ7FFFFFH(@24bit)
ʹରͯ͠͸ਖ਼ͷϑϧεέʔϧɺ800000H(@24bit)ʹରͯ͠͸ෛͷϑϧεέʔϧɺ000000H(@24bit)Ͱͷཧ૝஋
͸VCOMిѹ͕ग़ྗ͞Ε·͢ɻ∆Σมௐൃ͕ثੜ͢ΔଳҬ֎ϊΠζ (γΣʔϐϯάϊΠζ)ͳʹؾ͕Δ৔߹͸ɺ
֎෇͚ͷϑΟϧλͰݮਰͤͯ͞Լ͍͞ɻ
Ξφϩάग़ྗ͸VCOM+਺mVఔ౓ͷDCΦϑηοτΛ࣋ͭͨΊɺ௨ৗͷ࢖༻Ͱ͸ίϯσϯαͰ DC੒෼ΛΧο
τ͠·͢ɻ
MS0409-J-01
- 55 -
2005/08