AK4671_10 Datasheet, PDF (75/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
■ Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit is changed to “1”, the output signal is
attenuated to −∞ (“0”) during the cycle set by the OVTM bit. When the SMUTE bit is returned to “0”, the mute is
cancelled and the output attenuation gradually changes to the value set by the OVL/R7-0 bits during the cycle set of the
OVTM bit. If the soft mute is cancelled within the cycle set by the OVTM bit after starting the operation, the attenuation
is discontinued and returned to the value set by the OVL/R7-0 bits. The soft mute is effective for changing the signal
source without stopping the signal transmission (Figure 63).
SMUTE bit
OVL/R7-0 bits
A tte n u a tio n
OVTM bit
(1)
OVTM bit
(3)
-∞
GD
GD
(2)
Analog O utput
Figure 63. Soft Mute Function
(1) The output signal is attenuated until −∞ (“0”) in the cycle set by the OVTM bit.
(2) Analog output corresponding to digital input has the group delay (GD).
(3) If the soft mute is cancelled within the cycle set by the OVTM bit, the attenuation is discounted and returned to the
value set by the OVL/R7-0 bits.
MS0666-E-02
- 75 -
2010/06