[AK4646]
<Speaker-Amp Control Sequence>
Speaker-Amp is powered-up/down by PMSPK bit. When PMSPK bit is “0”, both SPP and SPN pins 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 SVDD/2 voltage.
When the PMSPK bit is “1” after PDN pin is controlled from “L” to “H”, the SPP and SPN pins rise up from
power-save-mode. In this mode, the SPP pin is placed in a Hi-Z state and the SPN pin goes to SVDD/2 voltage. Because
the SPP and SPN pins rise up at power-save-mode, this mode can reduce pop noise. When the AK4646 is powered-down,
pop noise can be also reduced by first entering power-save-mode.
PMSPK
0
SPPSN
Mode
Power-down
Power-save
SPP
Hi-Z
Hi-Z
SPN
Hi-Z
SVDD/2
x
0
1
(default)
1
Normal Operation
Normal Operation Normal Operation
Table 45. Speaker-Amp Mode Setting (x: Don’t care)
PMSPK bit
SPPSN bit
>1ms
SPP pin
SPN pin
Hi-Z
Hi-Z
SVDD/2
SVDD/2
Hi-Z
Hi-Z
Figure 35. Power-up/Power-down Timing for Speaker-Amp
MS0557-E-05
2011/01
- 51 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
