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AK4633 Datasheet, PDF (53/82 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP | |||
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ASAHI KASEI
[AK4633]
<Control Sequence of Speaker Amp>
Speaker-Amp can be powered-up/down by controlling the PMSPK bit. When the PMSPK bit is â0â, the SPP and SPN
pins are placed in a Hi-Z state.
When the PMSPK bit is â1â and SPPSN bit is â0â, the Speaker-amp enters 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.
When the PMSPK bit is â1â and PDN pin is controlled from âLâ to âHâ, 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 AK4633 is powered-down,
pop noise can be also reduced by first entering power-save-mode.
PMSPKbit
SP PSNb i t
SPPpin
Hi-Z
Hi-Z
SPNpin Hi-Z SVDD/2
SVDD/2
Hi-Z
>t1(Note)
>0
(Note)
SPPSN bit should be set to â1â at more than 1ms after PMSPK bit is set to â1â. But, when BEEP Input Amp and Speaker
Amp are powered-up at the same time, SPPSN bit should be set to â1â after BEEP Input become stable. When the
resistance and capacitance of BEEP pin are R=20kâ¦, C=0.1µF, 10ms(=5Ï) is required for BEEP Input to become stable.
Figure 42. Power-up/Power-down Timing for Speaker-Amp
MS0447-E-03
- 53 -
2006/04
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