ak4648 AKM Semiconductor, Inc., ak4648 Datasheet - Page 64

• Manufacturer Part Number: ak4648
• Description: Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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When the LODIF bit is set to “0”, the LOUT/ROUT pins become stereo line mode. When DACL bit is “1”, Lch/Rch
signal of DAC is output from the LOUT/ROUT pins which is single-ended. When DACL bit is “0”, output signal is
muted and LOUT/ROUT pins output VCOM voltage. The load impedance is 10k Ω (min.). When the PMLO=LOPS bits
= “0”, the stereo line output enters power-down mode and the output is pulled-down to VSS1 by 100k Ω (typ.). When the
LOPS bit is “1”, stereo line output enters power-save mode. Pop noise at power-up/down can be reduced by changing
PMLO bit at LOPS bit = “1”. In this case, output signal line should be pulled-down to VSS1 by 20k Ω after AC coupled as
Figure 45. Rise/Fall time is 300ms(max.) at C=1 μ F and AVDD=3.3V. When PMLO bit = “1” and LOPS bits = “0”, stereo
line output is in normal operation.
LOVL bit set the gain of stereo line output.
When LOM bit = “1”, DAC output signal is output to LOUT and ROUT pins as (L+R)/2 mono signal.
When LOM3 bit = “1”, the signal selected by MICL3 and MICR3 bits (LIN3/RIN3 inputs or MIC-Amp outputs) to
LOUT and ROUT pins as (L+R)/2 mono signal.
MS0625-E-01
Stereo Line Output (LOUT/ROUT pins)
Table 53. MIN Input
LOPS
SPKG2-0 bits
0
1
000
001
010
011
100
101
110
111
LOVL
PMLO
0
1
0
1
0
1
DAC
Table 55. Stereo Line Output Volume Setting
Speaker-Amp Output Gain (typ.) at R
Table 54. Stereo Line Output Mode Select
ALC bit = “0”
+10.65dB
+12.65dB
Figure 44. Stereo Line Output
MIN
+2dB
+4.43dB
+6.43dB
Gain
0dB
Normal Operation
-6dB
N/A
N/A
0dB
DACL bit
Power-down
Power-save
Power-save
Mode
SPLP/SPLN or SPRP/SPRN
Output Voltage (typ.)
- 64 -
0.757 x AVDD
0.6 x AVDD
LOVL bit
ALC bit = “1”
+12.65dB
+14.65dB
Pull-down to VSS1
Fall down to VSS1
+6.43dB
+8.43dB
Normal Operation
Rise up to VCOM
LOUT/ROUT pin
+2dB
-4dB
N/A
N/A
i
= 20k Ω; N/A: Not available
(default)
ROUT pin
LOUT pin
(default)
(default)
[AK4648]
2007/06