AK4645AEZ Datasheet, PDF (23/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

[AK4645A]
■ EXT Slave Mode (M/S bit = “0”)
MCKI pin͔Β௚઀ɺADC, DACʹϚελΫϩοΫΛೖྗͰ͖·͢ɻ͜ͷϞʔυ͸௨ৗͷΦʔσΟΦCODEC
ͱͷI/Fʹରͯ͠׵ޓੑ͕͋Γ·͢ɻඞཁͳΫϩοΫ͸MCKI (256fs, 384fs, 512fs or 1024fs), BICK (≥32fs),
LRCK(fs)Ͱ͢ɻMCKIͱLRCK͸ಉ͢ظΔඞཁ͕͋Γ·͕͢Ґ૬Λ߹ΘͤΔඞཁ͸͋Γ·ͤΜɻMCKIͷೖྗ
प೾਺͸FS1-0 bitʹΑΓબ୒͢Δ͜ͱ͕ՄೳͰ͢ɻ(Table 5)
Mode
0
1
2
3
FS3-2 bits
Don’t care
Don’t care
Don’t care
Don’t care
FS1 bit FS0 bit
MCKI Input
Frequency
Sampling Frequency
Range
0
0
256fs
7.35kHz ∼ 48kHz (default)
0
1
1024fs
7.35kHz ∼ 13kHz
1
0
1
1
384fs
512fs
7.35kHz ∼ 48kHz
7.35kHz ∼ 26kHz
Table 5. EXT Slave Mode (M/S bit = “0”) ࣌ͷMCKIप೾਺ͷઃఆ
௿଎αϯϓϦϯά࣌͸ଳҬ֎ϊΠζͷͨΊɺDACग़ྗͷS/N͕ྼԽ͠·͢ɻMCKIʹೖྗ͞ΕΔϚελΫϩο
Ϋͷप೾਺Λ্͛Δ͜ͱͰɺS/NΛվળͰ͖·͢ɻTable 6͸DACग़ྗ͔ΒLOUT/ROUT pinsʹ௨ͨ͠৔߹ͷS/N
Ͱ͢ɻ
MCKI
S/N
(fs=8kHz, 20kHzLPF + A-weighted)
256fs
83dB
384fs
83dB
512fs
93dB
1024fs
93dB
Table 6. Relationship between MCKI and S/N of LOUT/ROUT pins
ADC or DAC͕ಈ࡞த(PMADL bit = “1”, PMADR bit = “1” or PMDAC bit = “1”)͸֎෦ΫϩοΫ(MCKI, BICK,
LRCK)ΛࢭΊͯ͸͍͚·ͤΜɻ͜ΕΒͷΫϩοΫ͕͞څڙΕͳ͍৔߹ɺ಺෦ʹμΠφϛοΫͳϩδοΫΛ࢖
༻͍ͯ͠ΔͨΊɺաిྲྀ͕ྲྀΕɺಈ࡞͕ҟৗʹͳΔՄೳੑ͕͋Γ·͢ɻΫϩοΫΛࢭΊΔ৔߹͸ύϫʔμ΢
ϯঢ়ଶ(PMADL=PMADR=PMDAC bits = “0”)ʹ͍ͯͩ͘͠͞ɻ
AK4645A
MCKI
BICK
LRCK
SDTO
SDTI
256fs, 384fs,
512fs or 1024fs
≥ 32fs
1fs
DSP or μP
MCLK
BCLK
LRCK
SDTI
SDTO
Figure 16. EXT Slave Mode
MS0986-J-00
- 23 -
2008/07