AK4645AEZ Datasheet, PDF (42/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

[AK4645A]
■ σΟΤϯϑΝγεϑΟϧλίϯτϩʔϧ
IIRϑΟϧλʹΑΔ3प೾਺(32kHz, 44.1kHz, 48kHz)ରԠͷσΟΤϯϑΝγεϑΟϧλ(tc=50/15μsಛੑ)Λ಺ଂ
͍ͯ͠·͢ɻೖྗσʔλʹରͯ͠ɺDEM1-0 bitsͰબ୒͞Εͨप೾਺ͷσΟΤϯϑΝγεϑΟϧλ͕༗ޮʹͳ
Γ·͢(Table 30)ɻ
DEM1 DEM0
Mode
0
0
44.1kHz
0
1
OFF
(default)
1
0
48kHz
1
1
32kHz
Table 30. σΟΤϯϑΝγείϯτϩʔϧ
■ όεϒʔετճ࿏
BST1-0 bitsΛίϯτϩʔϧ͢Δ͜ͱͰɺDAC͔Βόεϒʔετ͞Εͨ৴߸Λग़ྗ͢Δ͜ͱ͕Ͱ͖·͢(Table
31)ɻ·ͨɺBST1-0 bits = “01”(MIN)ݻʹఆ͢Δ͜ͱͰɺϔουϑΥϯग़ྗͷDCΧοτ༻ίϯσϯαΛ47μF
·Ͱখ͘͢͞Δ͜ͱ͕Ͱ͖·͢ɻόεϒʔετ͞Εͨ৴߸͕ϑϧεέʔϧΛ௒͑ͨ৔߹ɺDAC͔Βͷग़ྗ͕
ΫϦοϓ͠·͢ɻFigure 31͸−20dBͷ৴߸ϨϕϧΛೖྗͨ͠৔߹ͷόεϒʔετޙͷಛੑͰ͢ɻ
0
MAX
-5
MID
-10
MIN
-15
-20
-25
10
Boost Filter (fs=44.1kHz)
100
1000
Frequency [Hz]
Figure 31. όεϒʔετप೾਺ (fs=44.1kHz)
BST1
BST0
Mode
0
0
OFF
(default)
0
1
MIN
1
0
MID
1
1
MAX
Table 31. όεϒʔετίϯτϩʔϧ
10000
MS0986-J-00
- 42 -
2008/07