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AK4645AEZ Datasheet, PDF (25/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP
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[AK4645A]
■ γεςϜϦηοτ
ʹ্ཱ࣌͛ͪݯి͸ɺPDN pinʹҰ౓ “L”Λೖྗͯ͠ϦηοτΛߦͬͯԼ͍͞ɻγεςϜϦηοτ͕ߦΘΕΔ
ͱɺAK4645Aͷ಺෦Ϩδελ͸શͯॳظ஋ʹͳΓ·͢ɻ
PMDAC bit = “0”ͷঢ়ଶͰPMADL bit·ͨ͸PMADR bitΛ “0” → “1”ʹมߋ͢Δ͜ͱʹΑΓɺADCͷॳظԽα
ΠΫϧ͕։࢝͞Ε·͢ɻॳظԽαΠΫϧ͸1059/fs=24ms@fs=44.1kHzͰ͢ɻॳظԽαΠΫϧதͷADCग़ྗσ
ʔλ͸2’sίϯϓϦϝϯτͷ “0”Ͱ͢ɻॳظԽαΠΫϧऴྃޙɺADCͷग़ྗ͸Ξφϩάೖྗ৴߸ʹ૬౰͢Δσ
ʔλʹητϦϯά͠·͢ɻPMDAC bit = “1”ͷͱ͖ɺADCͷॳظԽαΠΫϧ͸͋Γ·ͤΜɻ
PMADL=PMADR bits = “0”ͰPMDAC bit = “0” Æ “1”ʹมߋ͢Δ͜ͱͰɺDACͷॳظԽαΠΫϧ͕։࢝͞Ε·
͢ɻॳظԽαΠΫϧ͸1059/fs=24ms@fs=44.1kHzͰ͢ɻॳظԽαΠΫϧதͷDACೖྗσʔλ͸಺෦Ͱ2’sίϯ
ϓϦϝϯτͷ “0”ݻʹఆ͞Ε·͢ɻॳظԽαΠΫϧ͕ऴྃ͢ΔͱɺDACͷ܈஗Ԇ(25/fs=0.6ms@fs=44.1kHz)ܦ
աޙɺDACग़ྗ͸σΟδλϧೖྗ৴߸ʹ૬౰͢ΔిѹʹͳΓ·͢ɻPMADL bit·ͨ͸PMADR bit͕ “1”ͷͱ
͖ɺDACͷॳظԽαΠΫϧ͸͋Γ·ͤΜɻ
■ ΦʔσΟΦΠϯλϑΣʔεϑΥʔϚοτ
4छྨͷσʔλϑΥʔϚοτ(Table 10)͕DIF1-0 bitsͰબ୒Ͱ͖·͢ɻશϞʔυͱ΋MSBϑΝʔετɺ2’sίϯ
ϓϦϝϯτͷσʔλϑΥʔϚοτͰ͢ɻΦʔσΟΦΠϯλϑΣʔε͸ϚελϞʔυͱεϨʔϒϞʔυʹରԠ
͠·͢ɻϚελϞʔυͰ͸LRCKͱBICK͸ग़ྗʹͳΓɺεϨʔϒϞʔυͰ͸ೖྗʹͳΓ·͢ɻ
Mode
0
1
2
3
DIF1 bit
0
0
1
1
DIF0 bit
0
1
0
1
SDTO (ADC) SDTI (DAC) BICK
DSP Mode DSP Mode ≥ 32fs
લ٧Ί
ޙ٧Ί
≥ 32fs
લ٧Ί
I2S׵ޓ
લ٧Ί
I2S׵ޓ
≥ 32fs
≥ 32fs
Table 10. Audio Interface Format
Figure
Table 11
Figure 22
Figure 23
Figure 24
Mode 1/2/3Ͱ͸SDTO͸BICKͷ “↓”Ͱग़ྗ͞ΕɺSDTI͸BICKͷ“↑”Ͱϥον͞Ε·͢ɻ
(default)
Mode 0 (DSPϞʔυ)Ͱ͸ɺBCKP, MSBS bitsʹΑΓɺΦʔσΟΦI/FͷλΠϛϯάΛมߋ͢Δ͜ͱ͕Ͱ͖·͢
(Table 11)É»
DIF1
0
DIF0
0
MSBS
0
0
1
1
BCKP
Audio Interface Format
SDTOͷMSBσʔλ͸LRCK “↑”ޙͷ1ճ໨ͷBICK
0 “↑”Ͱग़ྗ͞Εɺͦͷ௚ޙͷBICK “↓”ͰSDTIͷ
MSBσʔλ͕ϥον͞Ε·͢ɻ
SDTOͷMSBσʔλ͸LRCK “↑”ޙͷ1ճ໨ͷBICK
1 “↓”Ͱग़ྗ͞Εɺͦͷ௚ޙͷBICK “↑”ͰSDTIͷ
MSBσʔλ͕ϥον͞Ε·͢ɻ
SDTOͷMSBσʔλ͸LRCK “↑”ޙͷ1ճ໨ͷBICK
0 “↓” ͷ࣍ͷBICK “↑”Ͱग़ྗ͞Εɺͦͷ௚ޙͷBICK
“↓”ͰSDTIͷMSBσʔλ͕ϥον͞Ε·͢ɻ
SDTOͷMSBσʔλ͸LRCK “↑”ޙͷ1ճ໨ͷBICK
1 “↑” ͷ࣍ͷBICK “↓”Ͱग़ྗ͞Εɺͦͷ௚ޙͷBICK
“↑”ͰSDTIͷMSBσʔλ͕ϥον͞Ε·͢ɻ
Table 11. Audio Interface Format in Mode 0
Figure
Figure 18
Figure 19
Figure 20
Figure 21
(default)
ADCΑΓग़ྗ͞Εͨ16bitσʔλΛ8bitσʔλ΁ม͠׵อଘ͢Δ৔߹ɺ16bitσʔλΛ୯७ʹ੾ΓࣺͯΔͱɺ16bit
σʔλͷ “−1”͸8bitσʔλͰ “−1”ʹม͞׵Ε·͢ɻ͜ͷ8bitσʔλͷ “−1”ΛDACʹͯ࠶ੜ͢ΔͨΊ16bitσʔ
λʹ࠶ม͢׵Δͱ “–256”ͱͳΓେ͖ͳϊΠζʹͳΓ·͢ɻ8bitσʔλ΁ม͢׵Δલʹɺ16bitσʔλʹΦϑη
οτ(128)ΛՃࢉ͢Δ͜ͱΛਪ঑͠·͢ɻ
MS0986-J-00
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2008/07
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