AK4618 Datasheet, PDF (41/60 Pages) Asahi Kasei Microsystems – 192kHz 24-bit 6ch/12ch Audio CODEC with Microphone Interface

[AK4618]
■ Soft Mute Operation
Soft mute operation is performed in the digital domain. When the SMUTEN bit is set “0”, the output signal is attenuated
to - in the cycle set by ATS bits (Table 15) 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 bits. 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.
SMUTEN bit
ATT Level
(1)
Attenuation
(2)
(4)
-
GD
GD
(3)
AOUT
Notes:
(1) The time for input data attenuation to - (Table 15). For example, this time is 4080LRCK cycles (4080/fs) at
ATT_DATA=00H. ATT transition of the soft-mute is from 00H to FFH
(2) The time for input data recovery to ATT level (Table 15). For example, this time is 4080LRCK cycles (4080/fs) at
ATT-DATA=FFH. ATT transition of soft-mute is from FFH to 00H.
(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 35. Soft Mute
■ System Reset
The AK4618 should be reset once by bringing the PDN pin = “L” upon power-up. The AK4618 is powered up and the
internal timing starts clocking by MCLK or LRCK “” after exiting the power down state of reference voltage (such as
VCOM) by the PDN pin. The AK4618 is in power-down mode until MCLK and LRCK, BICK are input.
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2015/01