AK4649 Datasheet, PDF (59/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK-AMP

[AK4649]
[Stereo Line Output Control Sequence (when using Pop Noise Reduction Circuit)]
(2 )
P M L O b it
(1)
(3 )
(4 )
LO P S bit
L O U T , R O U T p in s
≥ 300 m s
N orm al O utput
(5 )
(6)
≥ 300 m s
99% VCOM
1% VCOM
Figure 42. Stereo Line Output Control Sequence (when using Pop Noise Reduction Circuit)
(1) Set LOPS bit = “1”. Stereo line output enters the power-save mode.
(2) Set PMLO bit = “1”. Stereo line output exits the power-down mode.
LOUT and ROUT pins rise up to 99% VCOM voltage. Rise time is 200ms (max 300ms) at C=1μF.
(3) Set LOPS bit = “0”. After LOUT and ROUT pins rise up, stereo line output exits the power-save mode.
Stereo line output is enabled.
(4) Set LOPS bit = “1”. Stereo line output enters power-save mode.
(5) Set PMLO bit = “0”. Stereo line output enters power-down mode.
LOUT and ROUT pins fall down to 1% VCOM voltage. Fall time is 200ms (max 300ms) at C=1μF.
(6) Set LOPS bit = “0”. After LOUT and ROUT pins fall down, stereo line output exits the power-save mode
■ Speaker Output
The DAC output signal is input to the Speaker-amp as [(L+R)/2]. The Speaker-amp is mono and BTL output. The gain is
set by SPKG1-0 bits. Output level depends on AVDD voltage and SPKG1-0 bits.
SPKG1-0 bits
00
01
10
11
Gain
ALC2 bit = “0” ALC2 bit = “1”
+3.3dB
+5.3dB
+5.3dB
+7.3dB
+7.3dB
+9.3dB
+9.3dB
+11.3dB
Table 54. SPK-Amp Gain
(default)
SPK-Amp Output (DAC Input=0dBFS,
SPKG1-0 bits
AVDD=SVDD=3.3V)
ALC2 bit = “0”
ALC2 bit = “1”
(LMTH1-0 bits = “00”)
00
3.37Vpp
3.17Vpp
01
4.23Vpp (Note 44)
4.00Vpp
10
5.33Vpp (Note 44)
5.04Vpp (Note 44)
11
6.71Vpp (Note 44)
6.33Vpp (Note 44)
Note 44. The output level is calculated by assuming that output signal is not clipped. In actual case, output signal may be
clipped when DAC outputs 0dBFS signal. DAC output level should be set to lower level by setting digital
volume so that Speaker-Amp output level is 4.0Vpp or less and output signal is not clipped.
Table 55. SPK-Amp Output Level
MS1023-E-01
- 59 -
2010/08