AK4631 Datasheet, PDF (28/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
„ ΦʔσΟΦΠϯλϑΣʔεϑΥʔϚοτ
4छྨͷσʔλϑΥʔϚοτ(Table 12)͕DIF1-0 bitͰબ୒Ͱ͖·͢ɻશϞʔυͱ΋MSBϑΝʔετɺ2’sίϯϓ
ϦϝϯτͷσʔλϑΥʔϚοτͰ͢ɻΦʔσΟΦΠϯλϑΣʔε͸ϚελϞʔυͱεϨʔϒϞʔυʹରԠ͠
·͢ɻϚελϞʔυͰ͸FCKͱBICK͸ग़ྗʹͳΓɺεϨʔϒϞʔυͰ͸ೖྗʹͳΓ·͢ɻ
Mode 1-3Ͱ͸ɺSDTO͸BICKͷ “↓”Ͱग़ྗ͞ΕɺSDTI͸BICKͷ“↑”Ͱϥον͞Ε·͢ɻ
Mode
0
1
2
3
DIF1
0
0
1
1
DIF0
0
1
0
1
SDTO (ADC) SDTI (DAC) BICK
DSP Mode DSP Mode ≥ 16fs
લ٧Ί
ޙ٧Ί
≥ 32fs
લ٧Ί
I²S׵ޓ
લ٧Ί
I²S׵ޓ
≥ 32fs
≥ 32fs
Table 12. Audio Interface Format
Figure
See Table 11
Figure 26
Figure 27
Figure 28
Default
Mode 0 (DSPϞʔυ)Ͱ͸ɺBCKP, MSBS bitʹΑΓɺΦʔσΟΦI/FͷλΠϛϯάΛมߋ͢Δ͜ͱ͕Ͱ͖·͢ɻ
BCKP bit = “0”ͷ৔߹ɺSDTO͸BICKͷ“↑”Ͱग़ྗ͞ΕɺSDTI͸BICKͷ“↓”Ͱϥον͞Ε·͢ɻ
BCKP bit = “1”ͷ৔߹ɺSDTO͸BICKͷ“↓”Ͱग़ྗ͞ΕɺSDTI͸BICKͷ“↑”Ͱϥον͞Ε·͢ɻ
MSBS bit͸ɺSDTO/SDTIͷMSBσʔλͷҐஔΛBICKͷ൒पظ෼γϑτ͢Δ͜ͱ͕Ͱ͖·͢ɻ
MSBS bit BCKP bit
Audio Interface Format
0
0
Figure 22
0
1
Figure 23
1
0
Figure 24
1
1
Figure 25
Table 13. Audio Interface Format in Mode 0
ADCΑΓग़ྗ͞Εͨ16bitσʔλΛ8bitσʔλ΁ม͠׵อଘ͢Δ৔߹ɺ16bitσʔλΛ୯७ʹ੾ΓࣺͯΔͱɺ16bit
σʔλͷ “-1” ͸8bitσʔλͰ “-1”ʹม͞׵Ε·͢ɻ͜ͷ8bitσʔλͷ “-1” ΛDACʹͯ࠶ੜ͢ΔͨΊʹ16bitσ
ʔλʹ࠶ม͢׵Δͱ “-256” ͱͳΓେ͖ͳϊΠζʹͳΓ·͢ɻ8bitσʔλ΁ม͢׵Δલʹɺ16bitσʔλʹΦϑ
ηοτʢ128ʣΛՃࢉ͢Δ͜ͱΛਪ঑͠·͢ɻ
„ γεςϜϦηοτ
ʹ্ཱ࣌͛ͪݯి͸ɺPDN pinʹҰ౓“L”Λೖྗͯ͠ϦηοτΛߦͬͯԼ͍͞ɻγεςϜϦηοτ͕ߦΘΕΔ
ͱɺAK4631ͷ಺෦Ϩδελ͸શͯॳظ஋ʹͳΓ·͢ɻ
PMADC bitΛ“0” → “1”ʹมߋ͢Δ͜ͱͰɺADCͷॳظԽαΠΫϧ͕։࢝͞Ε·͢ɻॳظԽαΠΫϧ͸
1059/fs=133ms@fs=8kHzͰ͢ɻॳظԽαΠΫϧதɺADCग़ྗσʔλ͸2’sίϯϓϦϝϯτͷ“0”Ͱ͢ɻॳظԽα
ΠΫϧऴྃޙɺADCͷग़ྗ͸Ξφϩάೖྗ৴߸ʹ૬౰͢ΔσʔλʹητϦϯά͠·͢ɻDACʹ͸͜ͷॳظԽ
αΠΫϧ͸͋Γ·ͤΜɻ
MS0317-J-01
- 28 -
2004/11