AK4645EN Datasheet, PDF (49/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4645]
„ σΟΤϯϑΝγεϑΟϧλίϯτϩʔϧ
IIRϑΟϧλʹΑΔ3प೾਺(32kHz, 44.1kHz, 48kHz)ରԠͷσΟΤϯϑΝγεϑΟϧλ(tc=50/15µsಛੑ)Λ಺ଂ
͍ͯ͠·͢ɻೖྗσʔλʹରͯ͠ɺDEM1-0 bitsͰબ୒͞Εͨप೾਺ͷσΟΤϯϑΝγεϑΟϧλ͕༗ޮʹͳ
Γ·͢(Table 37)ɻ
DEM1 DEM0
Mode
0
0
44.1kHz
0
1
OFF
Default
1
0
48kHz
1
1
32kHz
Table 37. σΟΤϯϑΝγείϯτϩʔϧ
„ όεϒʔετճ࿏
BST1-0 bitsΛίϯτϩʔϧ͢Δ͜ͱͰɺDAC͔Βόεϒʔετ͞Εͨ৴߸Λग़ྗ͢Δ͜ͱ͕Ͱ͖·͢(Table
38)ɻ·ͨɺBST1-0 bits = “01”(MIN)ݻʹఆ͢Δ͜ͱͰɺϔουϑΥϯग़ྗͷDCΧοτ༻ίϯσϯαΛ47µF
·Ͱখ͘͢͞Δ͜ͱ͕Ͱ͖·͢ɻόεϒʔετ͞Εͨ৴߸͕ϑϧεέʔϧΛ௒͑ͨ৔߹ɺDAC͔Βͷग़ྗ͕
ΫϦοϓ͠·͢ɻFigure 38͸−20dBͷ৴߸ϨϕϧΛೖྗͨ͠৔߹ͷόεϒʔετޙͷಛੑͰ͢ɻ
0
MAX
-5
MID
-10
MIN
-15
-20
-25
10
Boost Filter (fs=44.1kHz)
100
1000
Frequency [Hz]
Figure 38. όεϒʔετप೾਺ (fs=44.1kHz)
BST1
BST0
Mode
0
0
OFF
Default
0
1
MIN
1
0
MID
1
1
MAX
Table 38. όεϒʔετίϯτϩʔϧ
10000
MS0543-J-00
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2006/09