AK4642VN Datasheet, PDF (28/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
„ 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), LRCK(fs)Ͱ͢ɻMCKIͱLRCK͸
ಉ͢ظΔඞཁ͕͋Γ·͕͢Ґ૬Λ߹ΘͤΔඞཁ͸͋Γ·ͤΜɻMCKIͷೖྗप೾਺͸FS1-0 bitʹΑΓબ୒͢
Δ͜ͱ͕ՄೳͰ͢ɻ(See Table 11)
Mode
0
1
2
3
Others
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
Others
N/A
N/A
Table 11. EXT Slave Mode (PMPLL bit = “0”, M/S bit = “0”) ࣌ͷMCKIप೾਺ͷઃఆ
௿଎αϯϓϦϯά࣌͸ଳҬ֎ϊΠζͷͨΊɺDACग़ྗͷS/N͕ྼԽ͠·͢ɻMCKIʹೖྗ͞ΕΔϚελΫϩο
Ϋͷप೾਺Λ্͛Δ͜ͱͰɺS/NΛվળͰ͖·͢ɻTable 12͸DACग़ྗ͔ΒLOUT/ROUT pinʹ௨ͨ͠৔߹ͷ
S/NͰ͢ɻ
MCKI
S/N
(fs=8kHz, 20kHzLPF + A-weighted)
256fs
83dB
512fs
93dB
1024fs
93dB
Table 12. 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”ʣʹ͍ͯͩ͘͠͞ɻ
AK4642
MCKO
MCKI
BICK
LRCK
SDTO
SDTI
256fs, 512fs or 1024fs
DSP or µP
MCLK
≥ 32fs
BCLK
1fs
LRCK
SDTI
SDTO
Figure 16. EXT Slave Mode
MS0358-J-02
- 28 -
2005/04