AK4125 Datasheet, PDF (22/26 Pages) Asahi Kasei Microsystems – 192kHz / 24Bit High Performance Asynchronous SRC

ASAHI KASEI
[AK4125]
2. δολ଱ྔ
AK4125ͷIBICKͼٴILRCKʹର͢Δδολ଱ྔΛFigure 17ʹࣔ͠·͢ɻδολྔ͸Figure 17ʹࣔ͞ΕΔΑ͏ʹ
δολप೾਺ͱδολͰ౓ڧఆٛ͞Εɺ0.01UIppҎԼͷδολ͋Ͱ౓ڧΕ͹प೾਺ʹؔΘΒͣਖ਼ৗʹಈ࡞͠·
͢ɻ
10.00
AK4125 Jitter Tolerance
1.00
0.10
(2)
0.01
0.00
1
10
(3)
(1)
100
Jitter Frequency [Hz]
1000
10000
(1) ਖ਼ৗʹಈ࡞Մೳ
(2) ࿪Έ͕ྼԽ͢ΔՄೳੑ͋Γ(−50dBఔ౓·ͰྼԽ͢Δ)
(3) ग़ྗσʔλ͕ܽམ͢ΔՄೳੑ͋Γ
஫ɿ
- PLL2-0 = “L/L/L”, “L/L/H”, “L/H/L”ͷ࣌ʹ͸ɺILRCK্ͷδολ͕ର৅ͱͳΓɺ1UI (Unit Interval)͸
ILRCKͷ1प͢ͰظɻFSI = 48kHzͷ࣌ʹ͸1UI͸1/48kHz = 20.8µsʹͳΓ·͢ɻ
- PLL2-0 = “H/*/*” (*͸Don’t care)ͷ࣌ʹ͸ɺIBCK্ͷδολ͕ର৅ͱͳΓɺ1UI͸IBICKͷ1प͢Ͱظɻ
FSI = 48kHzͷ࣌ʹ͸1UI͸1/(64 x 48kHz) = 326nsʹͳΓ·͢ɻ
Figure 17. Jitter Tolerance
„ ೖྗαϯϓϦϯάप೾਺มԽ΁ͷ௥ैੑ
ILRCK͕֎෦PLLͰੜ੒͞ΕΔ৔߹ɺ֎෦PLLͷप೾਺มԽ΁ͷԠ౴͕஗͍ͨΊɺೖྗαϯϓϦϯάप೾਺(FSI)
มߋޙͷऩଋʹ͕͔͔࣌ؒΔ৔߹͕͋Γ·͢ɻAK4125͸23%/secͷεϐʔυ·Ͱਖ਼ৗʹಈ࡞͠·͢ɻ23%/sec
ͷεϐʔυΛ௒͑ͨ৔߹ʹ͸ग़ྗσʔλ͕ҟৗʹͳΓ·͢ɻ
MS0379-J-01
- 22 -
2005/05