AK4642VN Datasheet, PDF (45/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
„ εςϨΦϥΠϯग़ྗ (LOUT, ROUT pin)
DACL bitΛ “1”ʹ͢ΔͱɺDACͷLch, Rch৴߸ΛͦΕͧΕLOUT, ROUT pin͔ΒγϯάϧΤϯυͰग़ྗ͠·͢ɻ
DACL bit Λ “0”ʹ͢Δͱɺग़ྗΛOFFʹ͢Δ͜ͱ΋ՄೳͰ͢ɻ͜ͷ࣌ɺLOUT, ROUT pin͸VCOMిѹΛग़ྗ
͠·͢ɻ·ͨɺෛՙ఍߅͸min. 10kΩͰ͢ɻPMLO bit = LOPS bit = “0” ʹ͢Δͱɺύϫʔμ΢ϯঢ়ଶʹͳΓAVSS
ʹ100kΩ(typ)Ͱϓϧμ΢ϯ͞Ε·͢ɻLOPS bit = “1”ͱ͢ΔͱɺύϫʔηʔϒϞʔυʹͳΓ·͢ɻ·ͨɺLOPS
bit = “1”ͱͯ͠ɺPMLO bitͰύϫʔμ΢ϯͷON/OFF Λߦ͏ͱɺON/OFF ࣌ʹൃੜ͢ΔϙοϓԻΛ௿͢ݮΔ͜
ͱ͕Ͱ͖·͢ɻ͜ͷͱ͖ɺFigure 29ʹࣔ͢Α͏ʹCΧοϓϧޙɺϥΠϯΞ΢τͷϥΠϯΛ20kΩͷ఍߅Ͱϓϧ
μ΢ϯ͍ͯͩ͘͠͞ɻ্ཱ͕ͪΓ͓ΑͼཱԼ͕Γͷ࣌ؒ͸C=1µFͷͱ͖ɺ࠷େ300msͰ͢ɻεςϨΦϥΠϯ
Ξ΢τ͸ɺPMLO bit = “1”͔ͭLOPS bit = “0”ͰύϫʔΞοϓঢ়ଶͱͳΓ·͢ɻ
εςϨΦϥΠϯग़ྗͷήΠϯ͸LOVL bitͰઃఆ͠·͢ɻ
DAC
“DACL”
“LOVL”
LOUT pin
ROUT pin
LOPS
0
1
Figure 28. 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 36. ϥΠϯΞ΢τͷϞʔυઃఆ (x: Don’t care)
Default
LOVL
Gain
ग़ྗిѹ(typ)
0
0dB
0.6 x AVDD
Default
1
+2dB
0.757 x AVDD
Table 37. ϥΠϯΞ΢τϘϦϡʔϜઃఆ
LOUT 1µF
ROUT
220Ω
20kΩ
Figure 29. εςϨΦϥΠϯग़ྗ֎෇͚ճ࿏(ϙοϓԻ௿ݮճ࿏࢖༻࣌)
MS0358-J-02
- 45 -
2005/04