AK4633 Datasheet, PDF (51/82 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4633]
„ Mono Line Output (AOUT pin)
A signal of DAC is output from AOUT pin. When the DACA bit is “0”, this output is OFF. The load resistance is
10kΩ(min). When PMAO bit is “0” and AOPS bit is “0”, the mono line output enters power-down and is pulled down by
100Ω(typ). When ADPS bit is “1”, the mono line output enters power-save mode. 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 Figure 39. 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.
1µF
AOUT
220Ω
20kΩ
Figure 39. AOUT external circuit in case of using POP Reduction function
AOUT Control Sequence in case of using POP Reduction Circuit
(2)
P M A O b it
(1)
(3)
A O P S b it
(5)
(4)
(6)
A O U T p in
≥ 300 m s
N orm al O utput
≥ 300 m s
(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 AVSS. 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.
Figure 40. Mono Line Output Control Sequence in case of using POP Reduction function
MS0447-E-03
- 51 -
2006/04