AK4647VQ Datasheet, PDF (42/72 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4647]
„ εςϨΦϥΠϯग़ྗ (LOUT, ROUT pin)
DACL bitΛ “1”ʹ͢ΔͱɺDACͷLch, Rch৴߸ΛͦΕͧΕLOUT, ROUT pins͔ΒγϯάϧΤϯυͰग़ྗ͠·
͢ɻDACL bit Λ “0”ʹ͢Δͱɺग़ྗΛOFFʹ͢Δ͜ͱ΋ՄೳͰ͢ɻ͜ͷ࣌ɺLOUT, ROUT pins͸VCOMిѹ
Λग़ྗ͠·͢ɻ·ͨɺෛՙ఍߅͸min. 10kΩͰ͢ɻPMLO bit = LOPS bit = “0” ʹ͢Δͱɺύϫʔμ΢ϯঢ়ଶʹ
ͳΓAVSSʹ100kΩ(typ)Ͱϓϧμ΢ϯ͞Ε·͢ɻLOPS bit = “1”ͱ͢ΔͱɺύϫʔηʔϒϞʔυʹͳΓ·͢ɻ
·ͨɺLOPS bit = “1”ͱͯ͠ɺPMLO bitͰύϫʔμ΢ϯͷON/OFF Λߦ͏ͱɺON/OFF ࣌ʹൃੜ͢ΔϙοϓԻ
Λ௿͢ݮΔ͜ͱ͕Ͱ͖·͢ɻ͜ͷͱ͖ɺFigure 31ʹࣔ͢Α͏ʹCΧοϓϧޙɺεςϨΦϥΠϯग़ྗͷϥΠϯ
Λ20kΩͷ఍߅Ͱϓϧμ΢ϯ͍ͯͩ͘͠͞ɻ্ཱ͕ͪΓ͓ΑͼཱԼ͕Γͷ࣌ؒ͸C=1μF, AVDD=3.3Vͷͱ͖ɺ
࠷େ300msͰ͢ɻεςϨΦϥΠϯग़ྗ͸ɺPMLO bit = “1”͔ͭLOPS bit = “0”ͰύϫʔΞοϓঢ়ଶͱͳΓ·͢ɻ
εςϨΦϥΠϯग़ྗͷήΠϯ͸LOVL bitͰઃఆ͠·͢ɻ
DAC
“DACL”
“LOVL”
LOUT pin
ROUT pin
LOPS
0
1
Figure 30. εςϨΦϥΠϯग़ྗ
PMLO
Mode
LOUT/ROUT pin
0
ύϫʔμ΢ϯ
Pull-down to AVSS
1
௨ৗಈ࡞
௨ৗಈ࡞
0
ύϫʔηʔϒ
Fall down to AVSS
1
ύϫʔηʔϒ
Rise up to VCOM
Table 37. εςϨΦϥΠϯग़ྗͷϞʔυઃఆ (x: Don’t care)
Default
LOVL
Gain
ग़ྗిѹ(typ)
0
0dB
0.6 x AVDD
Default
1
+2dB
0.757 x AVDD
Table 38. εςϨΦϥΠϯग़ྗϘϦϡʔϜઃఆ
LOUT 1μF
ROUT
220Ω
20kΩ
Figure 31. εςϨΦϥΠϯग़ྗ֎෇͚ճ࿏(ϙοϓԻ௿ݮճ࿏࢖༻࣌)
MS0566-J-00
- 42 -
2006/11