AK4955 Datasheet, PDF (55/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
■ Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit is set “1”, the output signal is attenuated by
-∞ (“0”) during the cycle set by DVTM bit. When the SMUTE bit is returned to “0”, the mute is cancelled and the output
attenuation gradually changes to the value set by DVL/R7-0 bits from -∞ during the cycle set by DVTM bit. If the soft
mute is cancelled within the cycle set by DVTM bit after starting the operation, the attenuation is discontinued and
returned to the level set by DVL/R7-0 bits.
SMUTE bit
DVL/R7-0 bits
Attenuation
DVTM bit
(1)
DVTM bit
(1)
(3)
-∞
GD
GD
(2)
Analog Output
Figure 44. Soft Mute Function
(1) The input signal is attenuated to −∞ (“0”) in the cycle set by DVTM bit.
(2) Analog output corresponding to digital input has group delay (GD).
(3) If soft mute is cancelled before attenuating to −∞, the attenuation is discounted and returned to the level set by
DVL/R7-0 bits within the same cycle.
MS1343-E-00
- 55 -
2011/12