ak4634 AKM Semiconductor, Inc., ak4634 Datasheet - Page 50

• Manufacturer Part Number: ak4634
• Description: 16-bit Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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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 +2dB. The load resistance is 10kΩ(min). When PMAO bit is “0” and AOPSN bit is “0”, the mono
line output enters power-down and is pulled down by 100Ω(typ). If PMAO bit is controlled at 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
mono line output enters power-up state.
AOUT Control Sequence in case of using POP Reduction Circuit
Rev. 0.5
Figure
MONO LINE OUTPUT (AOUT pin)
(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.
(3) Set AOPS bit = “0” after AOUT pin rises up. Mono line output exits the power-save mode.
(4) Set AOPS bit = “1”. Mono line output enters power-save mode.
(5) Set PMAO bit = “1”. Mono line output enters power-down mode.
(6) Set AOPS bit = “0” after AOUT pin falls down. Mono line output exits the power-save mode.
P M A O b it
A O P S b it
A O U T p in
41. This rising and falling time is max 300 ms at C = 1.0μF . When PMAO bit is “1” and AOPS bit is “0”, the
AOUT pin rises up to VCOM voltage. Rise time is 200ms (max 300ms) at C=1μF.
Mono line output is enabled.
AOUT pin falls down to VSS1. Fall time is 200ms (max 300ms) at C=1μF.
Figure 42. Mono Line Output Control Sequence when using POP Reduction function
Figure 41. AOUT external circuit when using POP Reduction function
( 1 )
( 2 )
≥ 3 0 0 m s
Table 36. Mono line output volume setting
LOVL bits
0
1
( 3 )
AOUT
N o r m a l O u tp u t
- 50 -
+2dB
Gain
0dB
1μF
220Ω
(default)
20kΩ
( 4 )
( 5 )
≥ 3 0 0 m s
( 6 )
[AK4634]
2007/10