AK5701 Datasheet, PDF (35/62 Pages) Asahi Kasei Microsystems – PLL & MIC-AMP 16-Bit Stereo ADC

ASAHI KASEI
[AK5701]
„ ALCಈ࡞
ALC bit = “1”ͷͱ͖ɺALCϒϩοΫʹΑΓɺALCಈ࡞͕ߦΘΕ·͢ɻ
1. ALCϦϛολಈ࡞
ALCϦϛολಈ࡞Ͱ͸Lch, Rchͷग़ྗϨϕϧͷͲͪΒ͔ҰํͰ΋ALCϦϛολݕग़ઃఆϨϕϧ(Table 22)Λӽ
͑ͨ৔߹ɺLMAT1-0 bitͰઃఆͨ͠஋(Table 23)͚ͩɺIVL, IVR஋(L/Rڞ௨)Λࣗಈతʹݮਰͤ͞·͢ɻ͜ͷͱ
͖IVL, IVR஋ͷมߋ͸L/Rڞ௨ͰߦΘΕ·͢ɻ
ZELMN bit = “0”(θϩΫϩεݕग़༗ޮ)ͷͱ͖ɺALCϦϛολಈ࡞ʹΑΓIVL, IVR஋͕มߋ͞ΕΔͷ͸ɺL/R
ಠཱʹͦΕͧΕθϩΫϩε͢Δ͔θϩΫϩελΠϜΞ΢τͨ͠ͱ͖Ͱ͢ɻθϩΫϩελΠϜΞ΢τ࣌ؒ͸
ALCϦΧόϦ࣌ؒͱڞ௨ͰɺZTM1-0 bitʹͯઃఆͰ͖·͢(Table 24)ɻ
ZELMN bit = “1”(θϩΫϩεݕग़ແޮ)ͷͱ͖ɺALCϦϛολಈ࡞ʹΑΓIVL, IVR஋͸ॠ࣌(पظ: 1/fs)ʹมߋ
͞Ε·͢ɻϦϛολಈ࡞ͷݮਰྔ͸LMAT1-0 bitͷઃఆʹ͔͔ΘΒͣ1 stepݻఆͰ͢ɻ
ݮਰಈ࡞ऴྃͰޙ΋ALC bitΛ “0”ݶ͍ͳ͠ʹΓɺ࠶ͼग़ྗϨϕϧ͕ALCϦϛολݕग़ϨϕϧΛӽ͑Ε͹ɺ͜
ͷݮਰಈ࡞͸܁Γฦ͞Ε·͢ɻ
LMTH1
0
0
1
1
LMTH0 ALCϦϛολݕग़Ϩϕϧ ALCϦΧόϦ଴ػΧ΢ϯλϦηοτϨϕϧ
0
ALC Output ≥ −2.5dBFS
1
ALC Output ≥ −4.1dBFS
−2.5dBFS > ALC Output ≥ −4.1dBFS
−4.1dBFS > ALC Output ≥ −6.0dBFS
0
ALC Output ≥ −6.0dBFS
−6.0dBFS > ALC Output ≥ −8.5dBFS
1
ALC Output ≥ −8.5dBFS
−8.5dBFS > ALC Output ≥ −12dBFS
Table 22. ALC Ϧϛολݕग़ϨϕϧʗϦΧόϦ଴ػΧ΢ϯλϦηοτϨϕϧ
Default
ZELMN
0
1
LMAT1 LMAT0 ALC ϦϛολATTεςοϓ
0
0
1 step
0.375dB Default
0
1
2 step
0.750dB
1
0
4 step
1.500dB
1
1
8 step
3.000dB
x
x
1step
0.375dB
Table 23. ALC ϦϛολATTεςοϓͷઃఆ
ZTM1
0
0
1
1
ZTM0
θϩΫϩελΠϜΞ΢τ࣌ؒ
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
1
256/fs
32ms
16ms
5.8ms
0
512/fs
64ms
32ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 24. ALCθϩΫϩελΠϜΞ΢τ࣌ؒͷઃఆ
Default
MS0404-J-00
- 35 -
2005/08