AK4125 Datasheet, PDF (18/26 Pages) Asahi Kasei Microsystems – 192kHz / 24Bit High Performance Asynchronous SRC

ASAHI KASEI
[AK4125]
„ ΫϩοΫ੾Γସ͑ͷखॱ

AK4125͢څڙ΁ΔΫϩοΫͷ੾Γସ͑खॱΛFigure 13ʹࣔ͠·͢ɻೋͭͷप೾਺ؒͰҐ૬มԽͳ͠ʹঃʑʹ
प೾਺͕ҠΓมΘΔ৔߹ɺͼٴfso/fsi > 4Λอͬͨঢ়ଶͰग़ྗଆͷΫϩοΫΛ੾Γସ͑ΔͱɺࣗಈϦηοτ͕
ߦΘΕͣΫϩοΫ੾Γସ͔͑Βਖ਼ৗͳσʔλग़ྗ·Ͱ100msҎ্͔͔ΔՄೳੑ͕͋Γ·͢ɻ100msҎ಺ʹऩΊ
͍ͨ৔߹͸PDN pinͰϦηοτͯ͠Լ͍͞(Figure 13ࢀর)ɻ
External clocks
(Input port
or Output port)
Clocks 1
Don’t care
Clocks 2
PDN pin
< 100ms
(Internal state)
Normal operation Power-down
PLL lock &
fs detection
Normal operation
SDTO
Normal data
Note1
Normal data
SMUTE (Note2,
recommended)
0dB
Att.Level
-∞dB
1024/fso
1024/fso
Figure 13. Sequence of changing clocks
Note 1. ͜ͷ࣌ग़ྗσʔλ͸ҟԻͱͳΔՄೳੑ͕͋Γ·͢ɻPDN pinΛ“L”ʹ͢ΔΑΓGDҎ্લ͔Β
SDTIʹ“0”σʔλ͕ೖྗ͞Ε͍ͯΕ͹ɺ͜ͷؒ΋“0”σʔλग़ྗͱͳΓ·͢ɻ
Note 2. Note 1ͷҟԻΛSMUTEͰআ͢ڈΔ͜ͱ͕Ͱ͖·͢ɻ
„ ΞϯϩοΫϐϯ

AK4125ͷ಺෦PLL͕ϩοΫ͍ͯ͠Δ৔߹ʹ͸UNOCK pin͸“L”Λग़ྗ͠·͢ɻ಺෦PLL͕ΞϯϩοΫͷ৔߹
͸ɺUNLOCK pin͸“H”Λग़ྗ͠·͢ɻύϫʔμ΢ϯঢ়ଶ(PDN pin = “L”)ͷ࣌΋“H”Λग़ྗ͠·͢ɻ
MS0379-J-01
- 18 -
2005/05