ak4671 AKM Semiconductor, Inc., ak4671 Datasheet - Page 93

• Manufacturer Part Number: ak4671
• Description: Stereo Codec With Mic/rcv/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

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When DACSL and DACSR bits are “1”, Lch/Rch signal of DAC is output from the LOUT3/ROUT3 pins which is
single-ended. When DACSL and DACSR bits are “0”, output signal is muted and LOUT3/ROUT3 pins output VCOM
voltage. The load impedance is 10k Ω (min.). When the PMLO3=PMRO3=LOPS3 bits = “0”, LOUT3/ROUT3 enters
power-down mode and the output is pulled-down to VSS1 by 100k Ω (typ). When the LOPS3 bit is “1”, LOUT3/ROUT3
enters power-save mode. Pop noise at power-up/down can be reduced by changing PMLO3 and PMRO3 bits at LOPS3
bit = “1”. In this case, output signal line should be pulled-down to VSS1 by 20k Ω after AC coupled as
time is 300ms(max) at C=1 μ F and AVDD=3.3V. When PMLO3=PMRO3 bits = “1” and LOPS3 bit = “0”,
LOUT3/ROUT3 is in normal operation.
L3VL3-0 bits control the volume of LOUT3/ROUT3.
When LOM3 bit = “1”, DAC output signal is output to LOUT3 and ROUT3 pins as (L+R) mono signal.
When LOOPM3 bit = “1”, the MIC-Amp signal is output to LOUT3 and ROUT3 pins as (L+R) mono signal.
MS0666-E-00
Stereo Line Output 3 (LOUT3/ROUT3 pins)
Figure 75. External Circuit for Stereo Line Output (in case of using Pop Noise Reduction Circuit)
LOPS3
LOPS3
0
1
0
1
PMLO3
PMRO3
L3VL1
Table 71. Stereo Line Output Mode Select (LOUT3)
Table 72. Stereo Line Output Mode Select (ROUT3)
0
1
0
1
0
1
0
1
1
1
0
0
Table 73. Stereo Line Output Volume Setting
Normal Operation
Normal Operation
Power-down
L3VL0
Power-down
Power-save
Power-save
Power-save
Power-save
1
0
1
0
ROUT3
LOUT3
Mode
Mode
- 93 -
1μF
Attenuation
+3dB
− 3dB
− 6dB
0dB
220Ω
Pull-down to VSS1
Fall down to VSS1
Pull-down to VSS1
Fall down to VSS1
Rise up to VCOM
Normal Operation
Normal Operation
Rise up to VCOM
LOUT3 pin
ROUT3 pin
20kΩ
(default)
(default)
(default)
Figure
75. Rise/Fall
[AK4671]
2007/10