AK4631 Datasheet, PDF (67/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
5. PLL εϨʔϒϞʔυ (MCKI pin)ͷ৔߹
PMPLL bit
(Addr:01H,D0)
MCKO bit
(Addr:01H,D1)
MCKPD bit
(Addr:01H,D2)
External MCKI
(1)
(1)
(1)
(2)
Input
Example
Audio I/F Format : DSP Mode, BCKP = MSBS = “0”
PLL Reference clock: MCKI
BICK frequency: 64fs
Sampling Frequency: 8kHz
(1) Addr:01H, Data:04H
(2) Stop the external clocks
Figure 54. Clock Stopping Sequence (3)
<खॱྫ>
(1) PLLͷύϫʔμ΢ϯ : PMPLL bit = “1” → “0”
MCKOग़ྗͷఀࢭ: MCKO bit = “1” → “0”
MCKI pinͷϓϧμ΢ϯ: MCKPD bit = “0” → “1”
MCKI pin΁ೖྗ͞ΕΔ৴߸͕ Hi-Z ͷͱ͖ɺMCKI pin Λϓϧμ΢ϯͯ͠Լ͍͞ɻ
(2) ֎෦ΫϩοΫΛࢭΊͯԼ͍͞ɻ
6. ֎෦ΫϩοΫϞʔυͷ৔߹
MCKPD bit
(Addr:01H,D2)
External MCKI
External BICK
External FCK
(1)
(2)
Input
(2)
Input
(2)
Input
Example
Audio I/F Format :MSB justified(ADC and DAC)
Input MCKI frequency:1024fs
Sampling Frequency:8kHz
(1) Addr:01H, Data:04H
(2) Stop the external clocks
Figure 55. Clock Stopping Sequence (4)
<खॱྫ>
(1) MCKI pinͷϓϧμ΢ϯ : MCKPD bit = “0” → “1”
MCKI pin΁ೖྗ͞ΕΔ৴߸͕ Hi-Z ͷͱ͖ɺMCKI pin Λϓϧμ΢ϯͯ͠Լ͍͞ɻ
(2) ֎෦ΫϩοΫΛࢭΊͯԼ͍͞ɻ
„ ύϫʔμ΢ϯ

֤ϒϩοΫΛύϫʔμ΢ϯ͠ɺΫϩοΫ͕͞څڙΕ͍ͯΔ৔߹͸ɺϚελΫϩοΫఀࢭޙɺVCOMΛύϫʔ
μ΢ϯͯ͠Լ͍͞ɻ·ͨɺ֎෦ೖྗΫϩοΫఀࢭޙɺPDN pin = “L”ͱ͢Δ͜ͱͰύϫʔμ΢ϯঢ়ଶʹ͢Δ͜
ͱ΋ՄೳͰ͢ɻୠ͠ɺϨδελ͕ॳظԽ͞Ε·͢ɻ




MS0317-J-01
- 67 -
2004/11