AK4125 Datasheet, PDF (16/26 Pages) Asahi Kasei Microsystems – 192kHz / 24Bit High Performance Asynchronous SRC

ASAHI KASEI
[AK4125]
„ ιϑτϛϡʔτػೳ
1. ManualϞʔυ
SRCग़ྗͷσΟδλϧ෦ʹιϑτϛϡʔτػೳΛ಺ଂ͠·͢ɻιϑτϛϡʔτ͸SMUTE pinͰίϯτϩʔϧ
Ͱ͖·͢ɻSMUTE pinΛ“H”ʹ͢Δͱ1024OLRCKαΠΫϧͰSRCग़ྗͷσʔλ͕−∞ (“0”)·ͰΞςωʔγϣϯ
͞Ε·͢ɻSMUTE pinΛ“L”ʹ͢Δͱ−∞ঢ়ଶ͕ղআ͞Εɺ−∞͔Β1024OLRCKαΠΫϧͰ0dB·Ͱ෮͢·͠ؼɻ
ιϑτϛϡʔτ։࢝ޙɺ1024OLRCKαΠΫϧҎ಺ʹղআ͞ΕΔͱΞςωʔγϣϯ͕தஅ͞Εɺಉ͡αΠΫϧ
Ͱ0dB·Ͱ෮͢·͠ؼɻιϑτϛϡʔτػೳ͸৴߸ΛࢭΊͣʹ৴߸ݯΛ੾Γସ͑Δ৔߹ͳͲʹ༗ޮͰ͢ɻ


SMUTE
0dB
(1)
Attenuation
1024/fso
(3)
-∞
GD
GD
(2)
SDTO


Figure 9. Soft Mute Function (Manual Mode)
(1) 1024OLRCKαΠΫϧ(1024/fso)Ͱग़ྗσʔλ͕−∞ (“0”)·ͰΞςωʔγϣϯ͞Ε·͢ɻ
(2) σΟδλϧೖྗʹର͢ΔσΟδλϧग़ྗ͸܈஗Ԇ(GD)Λ΋ͪ·͢ɻ
(3) 1024OLRCKαΠΫϧҎ಺ʹιϑτϛϡʔτ͕ղআ͞ΕΔͱΞςωʔγϣϯ͕தஅ͞Εɺಉ͡αΠΫϧͰ
0dB·Ͱ෮͢·͠ؼɻ
2. Semi-AutoϞʔυ
PLL2-0 pinͷઃఆ(Table 2ࢀর)ʹΑΓɺύϫʔμ΢ϯղআ(PDN pin = “L” → “H”)ͷ্ཱ͕ͪΓΤοδΛݕग़͠
ͯɺ4410/fso=100ms@fso=44.1kHzؒϛϡʔτΛܧଓͨ͠ޙɺιϑτϛϡʔτΛࣗಈͰղআ͠·͢ɻύϫʔμ
΢ϯϐϯղআޙɺSMUTE pin͕“H”ͷ৔߹ʹ͸ιϑτϛϡʔτ͕͔͔ͬͨঢ়ଶʹͳΓ·͢ɻ
PDN pin
“L”
SM UTE pin
Don’t care
“L”
0dB
Attenuation
-∞
SDTO
4410/fso
(1)
(2)
GD
Figure 10. Soft Mute Function (Semi-Auto Mode)
(1) 1024OLRCKαΠΫϧ(1024/fso)Ͱग़ྗσʔλ͕0dB·Ͱ෮͢·͠ؼɻ
(2) σΟδλϧೖྗʹର͢ΔσΟδλϧग़ྗ͸܈஗Ԇ(GD)Λ΋ͪ·͢ɻ
MS0379-J-01
- 16 -
2005/05