AK4636 Datasheet, PDF (64/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
■ MONO LINE OUTPUT (AOUT pin)
A signal of DAC is output from the AOUT pin. When the DACA bit is “0”, this output is OFF. When the LOVL bit is “1”,
this gain changes to +3dB (large amplitude outputs may clip). The load resistance is 10kΩ(min). When PMAO bit is “0”
and AOPS bit is “0”, the mono line output enters power-down state and it is pulled down by 100Ω(typ). If PMAO bit is
controlled when AOPS bit = “1”, POP noise will be reduced at power-up and down. Then, this line should be pulled down
by 20kΩ of resister after C-coupling shown in Figure 51. This rising and falling time is max 300 ms at C = 1.0μF. When
PMAO bit is “1” and AOPS bit is “0”, the mono line output enters power-up state.
DAC
AOUT
Input Level
LOVL bit
Gain
OUT
0dBFS
0
0dB
1.5Vpp
1
+3dB
2.12Vpp
Table 54. Mono Line Output Volume Setting
(default)
1μF
AOUT
220Ω
20kΩ
Figure 51. AOUT External Circuit when Using POP Reduction Function
AOUT Control Sequence in case of using POP Reduction Circuit
(2)
P M A O bit
(1 )
(3)
A O P S b it
(5)
(4)
(6)
A O U T p in
N orm al O utput
≥ 300 m s
≥ 300 m s
Figure 52. Mono Line Output Control Sequence when using POP Reduction Function
(1) Set AOPS bit = “1”. Mono line output enters the power-save mode.
(2) Set PMAO bit = “1”. Mono line output exits the power-down mode.
AOUT pin rises up to VCOM voltage. Rise time is 200ms (max 300ms) at C=1μF.
(3) Set AOPS bit = “0” after AOUT pin rises up. Mono line output exits the power-save mode.
Mono line output is enabled.
(4) Set AOPS bit = “1”. Mono line output enters power-save mode.
(5) Set PMAO bit = “1”. Mono line output enters power-down mode.
AOUT pin falls down to VSS1. Fall time is 200ms (max 300ms) at C=1μF.
(6) Set AOPS bit = “0” after AOUT pin falls down. Mono line output exits the power-save mode.
MS1012-E-01
- 64 -
2010/08