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AK4955 Datasheet, PDF (111/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP
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[AK4955]
■ Stereo Line Output
DVL7-0 bits
(Addr:13, 14H)
(1)
XXH
18H
Digital Filter Path
(Addr:1DH)
(2)
XXH
00H
DACL bit
(Addr:04H, D16)
(3)
LVCM1-0 bits
(Addr:04H, D1-0)
XX
01
LOPS bit
(Addr:04H, D5)
(5)
(6)
(8)
PMDAC bit
(Addr:00H, D18)
PMLO bit
(Addr:00H, D19)
LOUT pin
ROUT pin
(4)
(7)
>300 ms
>300 ms
Normal Output
Figure 88. Stereo Lineout Sequence
Example:
Digital Volume 2: 0dB
LCVM1-0 bis: 0dB
Programmable Filter OFF
(1) Addr:13, 14H, Data:18H
(2) Addr:1DH, Data:00H
(3) Addr:04H, Data:31H
(4) Addr:00H, Data:0CH
(5) Addr:04H, Data:11H
Playback
(6) Addr:04H, Data:31H
(7) Addr:00H, Data:00H
(8) Addr:04H, Data:11H
<Example>
At first, clocks should be supplied according to “Clock Set Up” sequence.
(1) Set up output digital volume 2 (Addr = 13, 14H)
(2) Set up Programmable Filter Path (PFDAC, ADCPF and PFSDO bits). (Addr = 1DH)
(3) Set up the path of “DAC → Stereo Lime-Amp”: DACL bit = “0” → “1” (Addr = 04H)
Set up the stereo line amplifier: LVCM1-0 bits = “xx” → “01”
Set the stereo line amplifier to power save mode. LOPS bit = “0” → “1”
(4) Power up Stereo Line-Amp: PMDAC = PMLO bits = “0” → “1” (Addr = 00H)
LOUT and ROUT pins rise up to VCOM voltage after PMLO bit is changed to “1”. Rise time to 99% VCOM
voltage is 300ms(max.) when C=1μF and RL=10kΩ.
(5) Exit power-save mode of Stereo Line-Amp: LOPS bit = “1” → “0” (Addr=04H)
LOPS bit should be set to “0” after LOUT and ROUT pins rise up. Stereo Line-Amp goes to normal operation
by setting LOPS bit to “0”.
(6) Enter power save mode of Stereo Line-Amp: LOPS bit = “0” → “1” (Addr = 04H)
(7) Power down DAC and Stereo Line-Amp: PMDAC=PMLO= “1” → “0”. (Addr=00H)
LOUT and ROUT pins fall down to 1% of the VCOM voltage. Fall time is 300ms (max.) at C=1μF and
RL=10kΩ.
(8) Disable the path of “DAC → Stereo Line-Amp”: DACL bit = “1” → “0” (Addr=04H)
Exit power-save mode of the Stereo-Line Amp: LOPS bit = “1” → “0”
LOPS bit should be set to “0” after LOUT and ROUT pins fall down.
MS1343-E-00
- 111 -
2011/12
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