ak4648 AKM Semiconductor, Inc., ak4648 Datasheet - Page 113

• Manufacturer Part Number: ak4648
• Description: Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

MS0625-E-01
(9) Fall down the common voltage of headphone-amp: HPMTN bit = “1” → “0”
(10) Power down headphone-amp: PMHPL = PMHPR bits = “1” → “0”
(11) Power down DAC and MIN-Amp: PMDAC = PMMIN bits = “1” → “0”
(12) Disable 5-band Equalizer: FBEQ bit = “1”
(13) Disable the path of “DAC → HP-Amp”: DACH bit = “1” → “0”
If the power supply is powered-off or headphone-Amp is powered-down before the common voltage goes to
VSS2, the pop noise occurs. It takes twice of
The fall time depends on HVDD and the capacitor value connected with the MUTET pin. When HVDD=3.3V
and the capacitor value is 1.0 μ F ± 30%, the time constant is
“0”
τ
- 113 -
f
that the common voltage goes to VSS2.
τ
f
= 260ms(max.).
[AK4648]
2007/06