AK4368 Datasheet, PDF (30/58 Pages) Asahi Kasei Microsystems – PLL & HP-AMP DAC

ASAHI KASEI
[AK4368]
„ ϔουϑΥϯΞϯϓ (HPL, HPR pins)

ϔουϑΥϯΞϯϓͷిݯ͸HVDD͔Β͞څڙΕ·͢ɻίϞϯిѹ͸MUTET pinͷిѹͰɺਪ঑ෛՙ఍߅͸
16ΩҎ্Ͱ͢ɻPMHPL=PMHPR bits = “1”ͰMUTEN bitΛ “1”ʹ͢ΔͱίϞϯిѹΛVCOM(=0.475 x AVDD)ʹ
্ཱͪ͛·͢ɻMUTEN bitΛ “0”ʹ͢ΔͱɺϔουϑΥϯΞϯϓͷίϞϯిѹΛHVSSʹཱͪԼ͛·͢ɻ
t_r: ্ཱ͕ͪΓ࣌ؒ(VCOM/2·Ͱ)
70k x C (typ)
t_f: ཱͪԼ͕Γ࣌ؒ(VCOM/2·Ͱ)
60k x C (typ)
Table 22. ϔουϑΥϯΞϯϓ্ཱ͕ͪΓʗཱͪԼ͕Γ࣌ؒ
ྫ : MUTET pinͷίϯσϯαC=1µFͷ৔߹
ɾ
ϔουϑΥϯΞϯϓ্ཱ͕ͪΓ࣌ؒ(VCOM/2·Ͱ): t_r = 70k x 1µ = 70ms(typ)
ɾ
ϔουϑΥϯΞϯϓཱͪԼ͕Γ࣌ؒ(VCOM/2·Ͱ): t_f = 60k x 1µ = 60ms(typ)
PMHPL, PMHPR bitsΛ “0”ʹ͢Δ͜ͱͰɺϔουϑΥϯΞϯϓΛ׬શʹύϫʔμ΢ϯ͢Δ͜ͱ͕Ͱ͖·͢ɻ͜
ͷ࣌ɺHPL, HPR pins͸HVSSͰ͢ɻ
PMHPL/R bit
MUTEN bit
VCOM
HPL/R pin ^VCOM/2
t_r
(1) (2)
t_f
(3)
(4)
Figure 21. ϔουϑΥϯΞϯϓͷύϫʔΞοϓʗμ΢ϯγʔέϯε
(1) ϔουϑΥϯΞϯϓͷύϫʔΞοϓ(PMHPL, PMHPR bits = “1”)ɻग़ྗ͸HVSSͷ··Ͱ͢ɻ
(2) ϔουϑΥϯΞϯϓͷίϞϯిѹ্ཱͪ͛(MUTEN bit = “1”)ɻMUTETͷίϯσϯαͱ಺෦఍߅ͷ࣌ఆ਺
ʹΑΓίϞϯిѹ্͕ঢͯ͠ߦ͖·͢ɻMUTET pin ͷίϯσϯαͷ༰ྔΛ “C”ͱͨ͠ͱ͖ɺVCOM/2·Ͱ
ͷ্ཱ͕ͪΓ࣌ؒ(t_r)͸70k x C(typ)ͱͳΓ·͢ɻ
(3) ϔουϑΥϯΞϯϓͷίϞϯిѹཱͪԼ͛(MUTEN bit = “0”)ɻMUTETͷίϯσϯαͱ಺෦఍߅ͷ࣌ఆ਺
ʹΑΓίϞϯిѹ͕HVSS΁Լ߱ͯ͠ߦ͖·͢ɻMUTET pin ͷίϯσϯαͷ༰ྔΛ “C”ͱͨ͠ͱ͖ɺ
VCOM/2·ͰͷཱͪԼ͕Γ࣌ؒ(t_f)͸60k x C(typ)ͱͳΓ·͢ɻ
(4) ϔουϑΥϯΞϯϓͷύϫʔμ΢ϯ(PMHPL, PMHPR bits = “1”)ɻग़ྗ͸HVSSͰ͢ɻϙοϓϊΠζ๷ࢭͷ
ͨΊɺϔουϑΥϯΞϯϓͷίϞϯిѹ͕׬શʹԼ͕͔ͬͯΒύϫʔμ΢ϯͯ͠Լ͍͞ɻ
MS0409-J-01
- 30 -
2005/08