AK4671_10 Datasheet, PDF (83/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
■ Stereo Line Output (LOUT1/ROUT1 pins)
When DACL and DACR bits are “1”, Lch/Rch signal of DAC is output from the LOUT1/ROUT1 pins which is
single-ended. When DACL and DACR bits are “0”, output signal is muted and LOUT1/ROUT1 pins output VCOM
voltage. The load impedance is 10kΩ (min.). When the PMLO1=PMRO1=LOPS1 bits = “0”, LOUT1/ROUT1 enters
power-down mode and the output is pulled-down to VSS1 by 100kΩ(typ). When the LOPS1 bit is “1”, LOUT1/ROUT1
enters power-save mode. Pop noise at power-up/down can be reduced by changing PMLO1 and PMRO1 bits at LOPS1
bit = “1”. In this case, output signal line should be pulled-down to VSS1 by 20kΩ after AC coupled as Figure 65. Rise/Fall
time is 300ms(max) at C=1μF and AVDD=3.3V. When PMLO1=PMRO1 bits = “1” and LOPS1 bit = “0”,
LOUT1/ROUT1 is in normal operation.
L1VL3-0 bits control the volume of LOUT1/ROUT1.
When LOM bit = “1”, DAC output signal is output to LOUT1 and ROUT1 pins as (L+R) mono signal.
When LOOPM bit = “1”, the MIC-Amp signal is output to LOUT1 and ROUT1 pins as (L+R) mono signal.
LOPS1
0
1
PMLO1
Mode
LOUT1 pin
0
Power-down
Pull-down to VSS1
1
Normal Operation
Normal Operation
0
Power-save
Fall down to VSS1
1
Power-save
Rise up to VCOM
Table 65. Stereo Line Output Mode Select (LOUT1)
(default)
LOPS1
0
1
PMRO1
Mode
ROUT1 pin
0
Power-down
Pull-down to VSS1
1
Normal Operation
Normal Operation
0
Power-save
Fall down to VSS1
1
Power-save
Rise up to VCOM
Table 66. Stereo Line Output Mode Select (ROUT1)
(default)
L1VL2-0
Attenuation
6H
+6dB
5H
0dB
(default)
4H
−6dB
3H
−12dB
2H
−18dB
1H
−24dB
0H
MUTE
Table 67. Stereo Line Output Volume Setting
LOUT1 1μF
ROUT1
220Ω
20kΩ
Figure 65. External Circuit for Stereo Line Output (in case of using Pop Noise Reduction Circuit)
MS0666-E-02
- 83 -
2010/06