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AK4632 Datasheet, PDF (35/70 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Mono CODEC with ALC & MIC/SPK/Video-AMP | |||
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ASAHI KASEI
[AK4632]
 MONO LINE OUTPUT (AOUT pin)
A signal of DAC is output from AOUT pin. When the DACA bit is â0â, this output is OFF. The load resistance is
10kâ¦(min). When PMAO bit is â0â and AOPSN bit is â0â, the mono line output enters power-down and is pulled down by
100â¦(typ). If PMAO bit is controlled at AOPSN bit = â1â, POP noise will be reduced at power-up and down. Then, this
line should be pulled down by 20k⦠of resister after C-coupling shown in Figure 33. This rising and falling time is max
300 ms at C=1.0µF . When PMAO bit is â1â and AOPSN bit is â0â, the mono line output enters power-up state.
1µF
AOUT
220â¦
20kâ¦
Figure 33. 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 N b it
(5)
(4)
(6)
A O U T p in
N orm al O utput
⥠300 m s
⥠300 m s
Figure 34. Mono Line Output Control Sequence in case of using POP Reduction function..
(1) Set AOPSN bit = â1â. Mono line output enters the power-save mode.
(2) Set PMAO bit = â1â. 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 AOPSN bit = â0â after AOUT pin rises up. Mono line output exits the power-save mode.
Mono line output is enabled.
(4) Set AOPSN bit = â1â. Mono line output enters power-save mode.
(5) Set PMAO bit = â1â. Mono line output enters power-down mode.
AOUT pin falls down to AVSS. Fall time is 200ms (max 300ms) at C=1µF.
(6) Set AOPSN bit = â0â after AOUT pin falls down. Mono line output exits the power-save mode.
MS0396-E-00
- 35 -
2005/06
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