AK4631 Datasheet, PDF (27/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
„ EXT Slave Mode (PMPLL bit = “0”, M/S bit = “0”)
PMPLL bitΛ“0”ʹ͢Δ͜ͱͰɺ֎෦ΫϩοΫϞʔυ(EXT Mode)Ͱಈ࡞͠ɺMCKI pin͔ΒPLLΛհͣ͞ʹ௚઀ɺ
ADC, DACʹϚελΫϩοΫΛೖྗͰ͖·͢ɻ͜ͷϞʔυ͸௨ৗͷΦʔσΟΦCODECͱͷI/Fʹରͯ͠׵ޓੑ
͕͋Γ·͢ɻඞཁͳΫϩοΫ͸MCKI (256fs, 512fs or 1024fs), BICK (≥32fs), FCK(fs)Ͱ͢ɻMCKIͱFCK͸ಉظ
͢Δඞཁ͕͋Γ·͕͢Ґ૬Λ߹ΘͤΔඞཁ͸͋Γ·ͤΜɻMCKIͷೖྗप೾਺͸FS3-0 bitʹΑΓબ୒͢Δ͜
ͱ͕ՄೳͰ͢ɻʢSee Table 10ʣ
Mode
0
1
2
3
FS3-2 bits
FS1 bit FS0 bit MCKI Input Sampling Frequency
Frequency
Range
Don’t care
0
0
256fs
7.35kHz ≤ fs ≤ 48kHz Default
Don’t care
0
1
1024fs
7.35kHz < fs ≤ 13kHz
Don’t care
1
0
256fs
7.35kHz < fs ≤ 48kHz
Don’t care
1
1
512fs
7.35kHz < fs ≤ 26kHz
Table 10. EXT Slave Mode (PMPLL bit = “0”, M/S bit = “0”) ࣌ͷMCKIप೾਺ͷઃఆ
EXT Slave ModeͰ͸ΦʔσΟΦΠϯλϑΣʔεϑΥʔϚοτͷMode 0ʹ͸ରԠ͍ͯ͠·ͤΜɻ
௿଎αϯϓϦϯά࣌͸ଳҬ֎ϊΠζͷͨΊɺDACग़ྗͷS/N͕ྼԽ͠·͢ɻMCKIʹೖྗ͞ΕΔϚελΫϩο
Ϋͷप೾਺Λ্͛Δ͜ͱͰɺS/NΛվળͰ͖·͢ɻTable 11͸DACग़ྗ͔ΒAOUTΞϯϓʹ௨ͨ͠৔߹ͷS/N
Ͱ͢ɻ
S/N
MCKI
(fs=8kHz, 20kHzLPF +
A-weighted)
256fs
83dB
512fs
93dB
1024fs
93dB
Table 11. Relationship between MCKI and S/N of AOUT
ADC or DAC͕ಈ࡞தʢPMADC bit = “1” or PMDAC bit = “1”ʣ͸֎෦ΫϩοΫ(MCKI, BICK, FCK)ΛࢭΊͯ͸
͍͚·ͤΜɻ͜ΕΒͷΫϩοΫ͕͞څڙΕͳ͍৔߹ɺ಺෦ʹμΠφϛοΫͳϩδοΫΛ࢖༻͍ͯ͠ΔͨΊɺ
աిྲྀ͕ྲྀΕɺಈ࡞͕ҟৗʹͳΔՄೳੑ͕͋Γ·͢ɻΫϩοΫΛࢭΊΔ৔߹͸ύϫʔμ΢ϯঢ়ଶʢPMADC bit
= PMDAC bit = “0”ʣʹ͍ͯͩ͘͠͞ɻ
AK4631
MCKO
MCKI
BICK
FCK
SDTO
SDTI
256fs, 512fs or 1024fs
DSP or µP
MCLK
32fs, 64fs
BCLK
1fs
FCK
SDTI
SDTO
Figure 21. EXT Slave Mode
MS0317-J-01
- 27 -
2004/11