AK4343VN Datasheet, PDF (40/99 Pages) Asahi Kasei Microsystems – Stereo DAC with HP/RCV/SPK-AMP

[AK4343]
■ ALCಈ࡞
ALC bit = “1”ͷͱ͖ɺALCϒϩοΫʹΑΓɺALCಈ࡞͕ߦΘΕ·͢ɻ
1. ALCϦϛολಈ࡞
ALCϦϛολಈ࡞Ͱ͸Lch, Rchͷग़ྗϨϕϧͷͲͪΒ͔ҰํͰ΋ALCϦϛολݕग़ઃఆϨϕϧ(Table 24)Λӽ
͑ͨ৔߹ɺLMAT1-0 bitsͰઃఆͨ͠஋(Table 25)͚ͩɺAVL, AVR஋(L/Rڞ௨)Λࣗಈతʹݮਰͤ͞·͢ɻ
ZELMN bit = “0”(θϩΫϩεݕग़༗ޮ)ͷͱ͖ɺALCϦϛολಈ࡞ʹΑΓAVL, AVR஋͕มߋ͞ΕΔͷ͸ɺL/R
ಠཱʹͦΕͧΕθϩΫϩε͢Δ͔θϩΫϩελΠϜΞ΢τͨ͠ͱ͖Ͱ͢ɻθϩΫϩελΠϜΞ΢τ࣌ؒ͸
ZTM1-0 bitsʹͯઃఆͰ͖·͢(Table 26)ɻ
ZELMN bit = “1”(θϩΫϩεݕग़ແޮ)ͷͱ͖ɺALCϦϛολಈ࡞ʹΑΓAVL, AVR஋͸ॠ࣌(पظ: 1/fs)ʹมߋ
͞Ε·͢ɻϦϛολಈ࡞ͷݮਰྔ͸LMAT1-0 bitsͷઃఆʹ͔͔ΘΒͣ1 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
1
ALC Output ≥ −8.5dBFS
−6.0dBFS > ALC Output ≥ −8.5dBFS
−8.5dBFS > ALC Output ≥ −12dBFS
Table 24. ALC Ϧϛολݕग़ϨϕϧʗϦΧόϦ଴ػΧ΢ϯλϦηοτϨϕϧ
(default)
ZELMN LMAT1 LMAT0 ALC ϦϛολATTεςοϓ
0
0
1 step
0.375dB (default)
0
0
1
2 step
0.750dB
1
0
4 step
1.500dB
1
1
8 step
3.000dB
1
x
x
1step
0.375dB
Table 25. ALC ϦϛολATTεςοϓͷઃఆ (x: Don’t care)
ZTM1
0
0
1
1
ZTM0
θϩΫϩελΠϜΞ΢τ࣌ؒ
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
1
256/fs
32ms
0
512/fs
64ms
16ms
32ms
5.8ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 26. ALCθϩΫϩελΠϜΞ΢τ࣌ؒͷઃఆ
(default)
MS0478-J-02
- 40 -
2010/11