AK4645EN Datasheet, PDF (31/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4645]
„ EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)
PMPLL bit = “0”͓ΑͼM/S bit = “1”ʹઃఆ͢Δ͜ͱͰɺ֎෦ΫϩοΫϚελϞʔυ(EXT Master Mode)Ͱಈ࡞
͠ɺMCKI pin͔ΒPLLΛհͣ͞ʹ௚઀ɺADC,DACʹϚελΫϩοΫΛೖྗͰ͖·͢ɻඞཁͳΫϩοΫ͸MCKI
(256fs, 512fs or 1024fs)Ͱ͢ɻMCKIͷೖྗप೾਺͸FS1-0 bitsʹΑΓબ୒͢Δ͜ͱ͕ՄೳͰ͢(See Table 14)ɻ
Mode
0
1
2
3
FS3-2 bits
FS1 bit FS0 bit
MCKI Input
Frequency
Sampling Frequency
Range
Don’t care
0
0
256fs
7.35kHz ∼ 48kHz Default
Don’t care
0
1
1024fs
7.35kHz ∼ 13kHz
Don’t care
1
0
256fs
7.35kHz ∼ 48kHz
Don’t care
1
1
512fs
7.35kHz ∼ 26kHz
Table 14. EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)࣌ͷMCKIप೾਺ͷઃఆ
௿଎αϯϓϦϯά࣌͸ଳҬ֎ϊΠζͷͨΊɺDACग़ྗͷS/N͕ྼԽ͠·͢ɻMCKIʹೖྗ͞ΕΔϚελΫϩο
Ϋͷप೾਺Λ্͛Δ͜ͱͰɺS/NΛվળͰ͖·͢ɻTable 15͸DACग़ྗ͔ΒLOUT/ROUT pinsʹ௨ͨ͠৔߹ͷ
S/NͰ͢ɻ
MCKI
S/N
(fs=8kHz, 20kHzLPF + A-weighted)
256fs
83dB
512fs
93dB
1024fs
93dB
Table 15. Relationship between MCKI and S/N of LOUT/ROUT pins
ADC·ͨ͸DAC͕ಈ࡞த(PMADL bit = “1”, PMADR bit = “1” or PMDAC bit = “1”)͸MCKIΛࢭΊͯ͸͍͚·ͤ
ΜɻMCKI͞څڙ͕Εͳ͍৔߹ɺ಺෦ʹμΠφϛοΫͳϩδοΫΛ࢖༻͍ͯ͠ΔͨΊɺաిྲྀ͕ྲྀΕɺಈ࡞
͕ҟৗʹͳΔՄೳੑ͕͋Γ·͢ɻMCKIΛࢭΊΔ৔߹͸ύϫʔμ΢ϯঢ়ଶ(PMADL=PMADR=PMDAC bits =
“0”)ʹ͍ͯͩ͘͠͞ɻ
AK4645
MCKO
MCKI
BICK
LRCK
SDTO
SDTI
256fs, 512fs or 1024fs
DSP or µP
MCLK
32fs or 64fs
BCLK
1fs
LRCK
SDTI
SDTO
Figure 24. EXT Master Mode
BCKO bit BICKग़ྗप೾਺
0
32fs
Default
1
64fs
Table 16. BICK Output Frequency at Master Mode
MS0543-J-00
- 31 -
2006/09