AK4645EN Datasheet, PDF (84/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4645]
1. άϥϯυͱిݯͷσΧοϓϦϯά
ͱݯిάϥϯυͷऔΓํʹ͸े෼஫ҙͯ͠Լ͍͞ɻ௨ৗɺAVDD, DVDD, TVDD, HVDDʹ͸γεςϜͷΞφ
ϩάిݯΛ͢·͠څڙɻAVDD, DVDD, TVDD, HVDD͕ผి͞څڙͰݯΕΔ৔߹ʹ͸ɺి্ཱ͛ͪݯγʔέ
ϯεΛߟ͑Δඞཁ͸͋Γ·ͤΜɻAVSS, HVSS͸Ξφϩάάϥϯυʹ઀ଓͯ͠Լ͍͞ɻγεςϜͷάϥϯυ
͸ΞφϩάͱσΟδλϧͰ෼͚ͯ഑ઢ͠PCϘʔυ্ͷి͜ͱ͍ۙʹݯΖͰ઀ଓͯ͠Լ͍͞ɻখ༰ྔͷσΧο
ϓϦϯάίϯσϯα͸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)Ͱ͢ɻAK4645͸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
MS0543-J-00
- 84 -
2006/09