AK4642VN Datasheet, PDF (29/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
„ γεςϜϦηοτ
ʹ্ཱ࣌͛ͪݯి͸ɺPDN pinʹҰ౓ “L”Λೖྗͯ͠ϦηοτΛߦͬͯԼ͍͞ɻγεςϜϦηοτ͕ߦΘΕΔ
ͱɺAK4642ͷ಺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·͢ɻॳظԽ͕αΠΫϧऴྃ͢ΔͱɺDACͷ܈஗Ԇ(21.8/fs=0.5ms@fs=44.1kHz)
ܦաޙɺDACग़ྗ͸σΟδλϧೖྗ৴߸ʹ૬౰͢ΔిѹʹͳΓ·͢ɻPMADL bit·ͨ͸PMADR bit͕ “1”ͷ
ͱ͖ɺDACͷॳظԽαΠΫϧ͸͋Γ·ͤΜɻ
„ ΦʔσΟΦΠϯλϑΣʔεϑΥʔϚοτ
3छྨͷσʔλϑΥʔϚοτ(Table 13)͕DIF1-0 bitͰબ୒Ͱ͖·͢ɻશϞʔυͱ΋MSBϑΝʔετɺ2’sίϯϓ
ϦϝϯτͷσʔλϑΥʔϚοτͰ͢ɻΦʔσΟΦΠϯλϑΣʔε͸ϚελϞʔυͱεϨʔϒϞʔυʹରԠ͠
·͢ɻϚελϞʔυͰ͸LRCKͱBICK͸ग़ྗʹͳΓɺεϨʔϒϞʔυͰ͸ೖྗʹͳΓ·͢ɻSDTO͸BICKͷ
“↓”Ͱग़ྗ͞ΕɺSDTI͸BICKͷ“↑”Ͱϥον͞Ε·͢ɻ
Mode
0
1
2
3
DIF1 bit
0
0
1
1
DIF0 bit
0
1
0
1
SDTO (ADC) SDTI (DAC) BICK
N/A
N/A
N/A
લ٧Ί
ޙ٧Ί
≥ 32fs
લ٧Ί
I²S׵ޓ
લ٧Ί
I²S׵ޓ
≥ 32fs
≥ 32fs
Table 13. Audio Interface Format
Figure
-
Figure 17
Figure 18
Figure 19
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
LRCK
0123
BICK(32fs)
SDTO(o)
15 14 13
9 10 11 12 13 14 15 0 1 2 3
7 6 5 4 3 2 1 0 15 14 13
9 10 11 12 13 14 15 0 1
7 6 5 4 3 2 1 0 15
SDTI(i)
15 14 13
0123
BICK(64fs)
SDTO(o)
15 14 13
7 6 5 4 3 2 1 0 15 14 13
15 16 17 18
31 0 1 2 3
10
15 14 13
7 6 5 4 3 2 1 0 15
15 16 17 18
31 0 1
10
15
SDTI(i)
Don't Care
15:MSB, 0:LSB
15 14
10
Don't Care
15 14
Lch Data
Rch Data
Figure 17. Mode 1λΠϛϯά
210
MS0358-J-02
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2005/04