AK4343 Datasheet, PDF (62/98 Pages) Asahi Kasei Microsystems – Stereo DAC with HP/RCV/SPK-AMP

ASAHI KASEI
[AK4343]
<Speaker-Amp Control Sequence>
Speaker-Amp is powered-up/down by PMSPK bit. When PMSPK bit is “0”, both SPP and SPN pin are in Hi-Z state.
When PMSPK bit is “1” and SPPSN bit is “0”, the Speaker-Amp enters power-save mode. In this mode, SPP pin is placed
in Hi-Z state and SPN pin goes to HVDD/2 voltage. Power-save mode can reduce the pop noise at power-up and
power-down.
PMSPK
0
1
SPPSN
Mode
SPP
SPN
x
Power-down
Hi-Z
Hi-Z
0
Power-save
Hi-Z
HVDD/2
1
Normal Operation Normal Operation Normal Operation
Table 56. Speaker-Amp Mode Setting (x: Don’t care)
Default
PMSPK bit
SPPSN bit
SPP pin
Hi-Z
Hi-Z
SPN pin _Hi-Z ^HVDD/2
HVDD/2
Hi-Z
>1ms
>0
Figure 59. Power-up/Power-down Timing for Speaker-Amp
MS0478-E-01
- 62 -
2006/10