AK4645AEZ Datasheet, PDF (24/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

[AK4645A]
■ EXT Master Mode (M/S bit = “1”)
M/S bit = “1”ʹઃఆ͢Δ͜ͱͰɺ֎෦ΫϩοΫϚελϞʔυ(EXT Master Mode)Ͱಈ࡞͠ɺMCKI pin͔Β௚઀ɺ
ADC, DACʹϚελΫϩοΫΛೖྗͰ͖·͢ɻඞཁͳΫϩοΫ͸MCKI (256fs, 384fs, 512fs or 1024fs)Ͱ͢ɻ
MCKIͷೖྗप೾਺͸FS1-0 bitsʹΑΓબ୒͢Δ͜ͱ͕ՄೳͰ͢(Table 7)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
Don’t care
0
1
1024fs
7.35kHz ∼ 13kHz
Don’t care
1
0
384fs
7.35kHz ∼ 48kHz
Don’t care
1
1
512fs
7.35kHz ∼ 26kHz
Table 7. EXT Master Mode (M/S bit = “1”)࣌ͷMCKIप೾਺ͷઃఆ
(default)
௿଎αϯϓϦϯά࣌͸ଳҬ֎ϊΠζͷͨΊɺDACग़ྗͷS/N͕ྼԽ͠·͢ɻMCKIʹೖྗ͞ΕΔϚελΫϩο
Ϋͷप೾਺Λ্͛Δ͜ͱͰɺS/NΛվળͰ͖·͢ɻTable 8͸DACग़ྗ͔ΒLOUT/ROUT pinsʹ௨ͨ͠৔߹ͷS/N
Ͱ͢ɻ
MCKI
S/N
(fs=8kHz, 20kHzLPF + A-weighted)
256fs
83dB
384fs
83dB
512fs
93dB
1024fs
93dB
Table 8. 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
AK4645A
MCKI
BICK
LRCK
SDTO
SDTI
256fs, 384fs,
512fs or 1024fs
32fs or 64fs
1fs
DSP or μP
MCLK
BCLK
LRCK
SDTI
SDTO
Figure 17. EXT Master Mode
BCKO bit BICKग़ྗप೾਺
0
32fs
(default)
1
64fs
Table 9. BICK Output Frequency at Master Mode
MS0986-J-00
- 24 -
2008/07