[AK4675]
■ Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit goes to “1”, the output signal is attenuated
by −∞ (“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 62).
SMUTE bit
OVTM bit
(1)
OVTM bit
OVL/R7-0 bits
Attenuation
(3)
-∞
GD
GD
(2)
Analog Output
Figure 62. Soft Mute Function
(1) The output signal is attenuated until −∞ (“0”) by the cycle set by the OVTM bit.
(2) Analog output corresponding to digital input has 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.
MS0963-E-00
2008/05
- 84 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
