|
AK4644 Datasheet, PDF (90/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/RCV-AMP | |||
|
◁ |
ASAHI KASEI
[AK4644]
 Stereo Line Output
FS3-0 bits 0,000
(Addr:05H, D5&D2-0)
(1)
DACL bit
(2)
(Addr:02H, D4)
IVL/R7-0 bits
(Addr:09H&0CH, D7-0)
E1H
DVL/R7-0 bits
(Addr:0AH&0DH, D7-0)
18H
LOPS bit
(Addr:03H, D6)
PMDAC bit
(Addr:00H, D2)
PMMIN bit
(Addr:00H, D5)
PMLO bit
(Addr:00H, D3)
LOUT pin
ROUT pin
(3)
(4)
(5)
1,111
(10)
91H
28H
(7)
(8)
(11)
(6)
(9)
>300 ms
Normal Output
>300 ms
Figure 81. Stereo Lineout Sequence
Example:
PLL, Master Mode
Audio I/F Format :MSB justified (ADC & DAC)
Sampling Frequency: 44.1kHz
Digital Volume: â8dB
LOVL=MINL bits = â0â
(1) Addr:05H, Data:27H
(2) Addr:02H, Data:10H
(3) Addr:09H&0CH, Data:91H
(4) Addr:0AH&0DH, Data:28H
(5) Addr:03H, Data:40H
(6) Addr:00H, Data:6CH
(7) Addr:03H, Data:00H
Playback
(8) Addr:03H, Data:40H
(9) Addr:00H, Data:40H
(10) Addr:02H, Data:00H
(11) Addr:03H, Data:00H
<Example>
At first, clocks should be supplied according to âClock Set Upâ sequence.
(1) Set up the sampling frequency (FS3-0 bits). When the AK4644 is PLL mode, DAC and Stereo Line-Amp
should be powered-up in consideration of PLL lock time after the sampling frequency is changed.
(2) Set up the path of âDAC Ã Stereo Line Ampâ: DACL bit = â0â Ã â1â
(3) Set up the input digital volume (Addr: 09H and 0CH)
When PMADL = PMADR bits = â0â, IVL7-0 and IVR7-0 bits should be set to â91Hâ(0dB).
(4) Set up the output digital volume (Addr: 0AH and 0DH)
When DVOLC bit is â1â (default), DVL7-0 bits set the volume of both channels. After DAC is powered-up,
the digital volume changes from default value (0dB) to the register setting value by the soft transition.
(5) Enter power-save mode of Stereo Line Amp: LOPS bit = â0â Ã â1â
(6) Power-up DAC, MIN-Amp and Stereo Line-Amp: PMDAC = PMMIN = PMLO bits = â0â â â1â
The DAC enters an initialization cycle that starts when the PMDAC bit is changed from â0â to â1â at PMADL
and PMADR bits are â0â. The initialization cycle time is 1059/fs=24ms@fs=44.1kHz. During the
initialization cycle, the DAC input digital data of both channels are internally forced to a 2's compliment, â0â.
The DAC output reflects the digital input data after the initialization cycle is complete. When PMADL or
PMADR bit is â1â, the DAC does not require an initialization cycle. When ALC bit is â1â, ALC is disable
(ALC gain is set by IVL/R7-0 bits) during an intialization cycle (1059/fs=24ms@fs=44.1kHz). After the
initialization cycle, ALC operation starts from the gain set by IVL/R7-0 bits.
LOUT and ROUT pins rise up to VCOM voltage after PMLO bit is changed to â1â. Rise time is 300ms(max)
at C=1µF and AVDD=3.3V.
(7) Exit power-save mode of Stereo Line-Amp: LOPS bit = â1â Ã â0â
LOPS bit should be set to â0â after LOUT and ROUT pins rise up. Stereo Line-Amp goes to normal operation
by setting LOPS bit to â0â.
(8) Enter power-save mode of Stereo Line-Amp: LOPS bit: â0â Ã â1â
(9) Power-down DAC, MIN-Amp and Stereo Line-Amp: PMDAC = PMMIN = PMLO bits = â1â â â0â
LOUT and ROUT pins fall down to AVSS. Fall time is 300ms(max) at C=1µF and AVDD=3.3V.
(10) Disable the path of âDAC Ã Stereo Line-Ampâ: DACL bit = â1â Ã â0â
(11) Exit power-save mode of Stereo Line-Amp: LOPS bit = â1â Ã â0â
LOPS bit should be set to â0â after LOUT and ROUT pins fall down.
MS0477-E-01
- 90 -
2006/10
|
▷ |