AK4368 Datasheet, PDF (20/58 Pages) Asahi Kasei Microsystems – PLL & HP-AMP DAC

ASAHI KASEI
[AK4368]
2) ֎෦ΫϩοΫϞʔυ(PMPLL bit = “0”: Default)
PMPLL bit Λ “0”ʹ͢Δ͜ͱͰɺ֎෦ΫϩοΫϞʔυ(EXT mode) Ͱಈ࡞͠ɺMCKI pin͔ΒPLLΛհͣ͞ʹ௚
઀DACʹϚελΫϩοΫΛೖྗͰ͖·͢ɻ͜ͷ৔߹ɺFS3-0 bitsͰબ୒Ͱ͖ΔΫϩοΫ͸Table 6ͷ௨ΓͰ͢ɻ
·ͨɺPLL3-0 bits ͷઃఆ͸ແࢹ͞Ε·͢ɻMCKOͷग़ྗ͸MCKO bitʹͯON/OFFՄೳͰɺग़ྗप೾਺͸PS1-0
bit ʹΑΓઃఆ͞Ε·͢ɻDACಈ࡞த (PMDAC bit = “1”) ʹαϯϓϦϯάप೾਺Λมߋ͢Δ৔߹͸ɺιϑτϛ
ϡʔτΛ͔͚Δ͔ɺ͋Δ͍͸ “0”σʔλΛೖྗ͔ͯ͠ΒαϯϓϦϯάप೾਺ͷมߋΛߦͬͯԼ͍͞ɻ
ϚελϞʔυ࣌(M/S bit = “1”)͸ɺLRCKͱBICK͕AK4368͔Βग़ྗ͞Ε·͢(Figure 13)ɻ ಈ࡞࣌(PMDAC bit =
“1”) ͸MCKI pin΁ͷೖྗΫϩοΫΛࢭΊͯ͸͍͚·ͤΜɻ͜ΕΒͷΫϩοΫ͕͞څڙΕͳ͍৔߹ɺ಺෦ʹμ
ΠφϛοΫͳϩδοΫΛ࢖༻͍ͯ͠ΔͨΊɺաిྲྀ͕ྲྀΕɺಈ࡞͕ҟৗʹͳΔՄೳੑ͕͋Γ·͢ɻΫϩοΫ
ΛࢭΊΔ৔߹͸DACΛύϫʔμ΢ϯঢ়ଶ(PMDAC bit = “0”)ʹͯ͠Լ͍͞ɻ
AK4368
MCKO
MCKI
BICK
LRCK
SDATA
256fs, 512fs or 1024fs
32fs, 64fs
DSP or µP
MCLK
BCLK
1fs
LRCK
SDTO
Figure 13. EXT Master Mode
εϨʔϒϞʔυ࣌(M/S bit = “0”)ʹඞཁͳΫϩοΫ͸ɺMCKI, BICK, LRCKͰ͢(Figure 14)ɻMCKIͱLRCK͸
ಉ͢ظΔඞཁ͕͋Γ·͕͢Ґ૬Λ߹ΘͤΔඞཁ͸͋Γ·ͤΜɻDACಈ࡞࣌(PMDAC bit = “1”) ͸֤֎෦Ϋϩο
Ϋ (MCKI, BICK, LRCK)ΛࢭΊͯ͸͍͚·ͤΜɻ͜ΕΒͷΫϩοΫ͕͞څڙΕͳ͍৔߹ɺ಺෦ʹμΠφϛοΫ
ͳϩδοΫΛ࢖༻͍ͯ͠ΔͨΊɺաిྲྀ͕ྲྀΕɺಈ࡞͕ҟৗʹͳΔՄೳੑ͕͋Γ·͢ɻΫϩοΫΛࢭΊΔ৔
߹͸DACΛύϫʔμ΢ϯঢ়ଶ (PMDAC bit = “0”)ʹͯ͠Լ͍͞ɻ
AK4368
MCKO
MCKI
BICK
LRCK
SDATA
256fs, 512fs or 1024fs
DSP or µP
MCLK
32fsʙ64fs
BCLK
1fs
LRCK
SDTO
Figure 14. EXT Slave Mode
MS0409-J-01
- 20 -
2005/08