AK4633EN Datasheet, PDF (53/83 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

[AK4633]
<Control Sequence of Speaker Amp>
Speaker-Amp can be powered-up/down by controlling the PMSPK bit. When the PMSPK bit is “0”, the SPP and SPN pins
are placed in a Hi-Z state.
When the PMSPK bit is “1” and SPPSN bit is “0”, 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 “1” and the 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 AK4633 is powered-down,
pop noise can be also reduced by first entering power-save-mode.
PMSPKbit
SPPSNb 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 “1” at more than 1ms after PMSPK bit is set to “1”. When BEEP Input Amp and Speaker Amp
are powered-up at the same time, SPPSN bit should be set to “1” after BEEP Input become stable. When the resistance and
capacitance of BEEP pin are R=20k and C=0.1F, 10ms(=5) is required for BEEP Input to become stable.
Figure 42. Power-up/Power-down Timing for Speaker-Amp
MS0447-E-06
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2015/10