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AK4367 Datasheet, PDF (17/38 Pages) Asahi Kasei Microsystems – OUTPUT MIXER & HP - AMP 24 BIT 2 CH DAC | |||
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ASAHI KASEI
[AK4367]
 Soft Mute
Soft mute operation is performed at digital domain. When the SMUTE bit goes to â1â, the output signal is attenuated by
ââ during ATT_DATAÃATT transition time (Table 5) from the current ATT level. When the SMUTE bit is returned to
â0â, the mute is cancelled and the output attenuation gradually changes to the ATT level during ATT_DATAÃATT
transition time. If the soft mute is cancelled before attenuating to ââ 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.
SMUTE bit
ATT Level
Attenuation
ATS bit
(1)
ATS bit
(1)
(3)
-â
GD
GD
(2)
Analog Output
Figure 14. Soft Mute Function
Notes:
(1) ATT_DATAÃATT transition time (Table 5). For example, this time is 3712LRCK cycles (3712/fs) at ATS bit =
â1â and ATT_DATA = â128â.
(2) The analog output corresponding to the digital input has a group delay, GD.
(3) If the soft mute is cancelled before attenuating to ââ after starting the operation, the attenuation is discontinued
and returned to ATT level by the same cycle.
MS0247-E-01
- 17 -
2004/11
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