[AK4129]
SMUTE pin,
SMUTE1-3 bit
(1)
0dB
(1)
(2)
Attenuation
-∞
All “0” code
SDTO
Note: SDTO is identified as SDTO1, SDTO2 and SDTO3.
(1) The soft mute cycle is selected by SMT1-0 pins. (Table 9) The output data is attenuated by −∞ during the soft mute
cycle.
(2) If the soft mute is cancelled before attenuating to −∞, the attenuation is discontinued and returned to 0dB by the same
clock cycles.
Figure 32. Soft Mute Function (Manual Mode) 2. Semi-Auto Mode
When power down of the AK4129 is released (PDN pin = “L” → “H”) with the SMSEMI pin= “H”, the AK4129 enters
semi-auto mode. In this mode, soft mute is cancelled automatically 4410/FSO after a rising edge of PDN (100ms
@FSO=44.1kHz). The soft mute is ON after releasing power down if the SMUTE pin = “H”. The SMSEMI pin must be set
during the PDN pin = “L”.
PDN pin
“L”
SMUTE pin
Attenuation
Don’t care
“L”
(2)
(1)
0dB
4410/fso
-∞
All “0” code
SDTO
Note: SDTO is identified as SDTO1, SDTO2 and SDTO3.
(1) The output data is attenuated by −∞ during the soft mute cycle (Table 9)
(2) When it is 0dB by a soft mute release after 4410/FSO, it is able to mute or release the mute by the soft mute cycle in
Table 9.
Figure 33. Soft Mute Function (Semi-Auto Mode)
MS1173-E-01
2010/09
- 31 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
