AK4558EN Datasheet, PDF (63/94 Pages) Asahi Kasei Microsystems – 108dB 216kHz 32Bit CODEC with PLL

[AK4558]
■ Soft Mute Operation
Soft mute operation is performed in the digital domain. When SMUTEN bit is set “1”, the output signal is
attenuated to - in the cycle set by ATS bit (Table 31) from the current ATT level. When the SMUTEN bit
is returned to “0”, the mute is cancelled and the output attenuation gradually changes to the ATT level in
the cycle set by ATS bit. If the soft mute is cancelled before attenuating to - after starting the operation,
attenuation is discontinued and it is returned to ATT level by the same cycle. Soft mute is effective for
changing the signal source without stopping the signal transmission.
SMUTE bit
ATT Level
(1)
Attenuation
(2)
(4)
-
GD
GD
(3)
LOUT/ROUT
Notes:
(1) The time for input data attenuation to - (Table 31). For example, this time is 4080LRCK cycles
(4080/fs) at ATT_DATA=FFH. ATT transition of the soft-mute is from FFH to 00H
(2) The time for input data recovery to ATT level (Table 31). For example, this time is 4080LRCK
cycles (4080/fs) at ATT-DATA=00H. ATT transition of soft-mute is from 00H to FFH.
(3) The analog output corresponding to the digital input has group delay (GD).
(4) If the soft mute is cancelled before attenuating to -, the attenuation is discontinued and returned to
ATT level by the same cycle.
Figure 40. Soft Mute
015004500-E-02
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2015/09