AK4366_04 Datasheet, PDF (16/31 Pages) Asahi Kasei Microsystems – Low Power 24-Bit 2ch DAC with HP-AMP

ASAHI KASEI
[AK4366]
„ Soft Mute
Soft mute operation is performed at digital domain. In serial mode (P/S pin = “L”), when the SMUTE bit goes to “1”, the
output signal is attenuated by −∞ during ATT_DATA×ATT transition time (Table 6) from the current ATT level. When
the SMUTE bit is returned to “0”, the mute is cancelled and the output attenuation gradually changes to the ATT level
during ATT_DATA×ATT transition time. If the soft mute is cancelled before attenuating to −∞ after starting the
operation, the attenuation is discontinued and returned to ATT level by the same cycle. The soft mute is effective for
changing the signal source without stopping the signal transmission. In parallel mode (P/S pin = “H”), soft mute is not
available.
SMUTE bit
ATT Level
Attenuation
ATS bit
(1)
ATS bit
(1)
(3)
-∞
GD
GD
(2)
Analog Output
Figure 13. Soft Mute Function
Notes:
(1) ATT_DATA×ATT transition time (Table 6). For example, this time is 3712LRCK cycles (3712/fs) at ATS bit =
“1” and ATT_DATA = “128”.
(2) The analog output corresponding to the digital input has a group delay, GD.
(3) If the soft mute is cancelled before attenuating to −∞ after starting the operation, the attenuation is discontinued
and returned to ATT level by the same cycle.
MS0248-E-01
- 16 -
2004/03