AK4373 Datasheet, PDF (57/98 Pages) Asahi Kasei Microsystems – Low Power Stereo DAC with HP/SPK-Amp

[AK4373]
■ Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit changed to “1”, the output signal is
attenuated by −∞ (“0”) during the cycle set by the 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 the DVL/R7-0 bits during the cycle set of the
DVTM bit. If the soft mute is cancelled within the cycle set by the DVTM bit after starting the operation, the attenuation
is discontinued and returned to the value set by the DVL/R7-0 bits. The soft mute is effective for changing the signal
source without stopping the signal transmission (Figure 49).
SMUTE bit
DVL/R7-0 bits
A tte n u a tio n
DVTM bit
(1)
DVTM bit
(3)
-∞
GD
GD
(2)
Analog O utput
Figure 49. Soft Mute Function
(1) The output signal is attenuated until −∞ (“0”) by the cycle set by the DVTM 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 DVTM bit, the attenuation is discounted and returned to the
value set by the DVL/R7-0 bits.
MS0991-E-00
- 57 -
2008/09