AK4646EN AKM [Asahi Kasei Microsystems], AK4646EN Datasheet - Page 51

• Manufacturer Part Number: AK4646EN
• Description: Stereo CODEC with MIC/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

<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.
MS0557-E-02
PMSPK
PMSPK bit
SPPSN bit
0
1
SPP pin
SPN pin
SPPSN
Hi-Z
x
0
1
Figure 35. Power-up/Power-down Timing for Speaker-Amp
Table 45. Speaker-Amp Mode Setting (x: Don’t care)
SVDD/2
Hi-Z
>1ms
Normal Operation
Power-down
Power-save
Mode
- 51 -
Normal Operation
Hi-Z
Hi-Z
SPP
Normal Operation
SVDD/2
Hi-Z
SPN
SVDD/2
Hi-Z
Hi-Z
(default)
[AK4646]
2007/05