AK4458 Datasheet, PDF (56/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 8ch Premium DAC

[AK4458]
■ Soft Mute Operation (PCM mode, DSD mode)
The soft mute operation is performed at digital domain. When the SMUTE pin goes to “H” or set SMUTE bit
to “1”, the output signal is attenuated by  during ATT_DATA  ATT transition time from the current ATT
level. When the SMUTE pin is returned to “L” or 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 , 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 pin or
SMUTE bit
(1)
ATT_Level
Attenuation
(1)
(3)
-
GD
GD
(2)
(2)
AOUT
DZF pin
(4)
8192/fs
Notes:
(1) ATT_DATA  ATT transition time. For example, this time is 4080LRCK cycles (1020/fs) at
ATT_DATA=255 in Normal Speed Mode.
(2) The analog output corresponding to the digital input has group delay (GD).
(3) If the soft mute is cancelled before attenuating  after starting the operation, the attenuation is
discontinued and returned to ATT level by the same cycle.
(4) When the input data for a zero detection channel is continuously zeros for 8192 LRCK cycles, the DZF
pin goes to “H”. The DZF pin immediately returns to “L” if input data are not zero.
Figure 57. Soft Mute Function
014011794-E-01
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2015/08