AK4637 Datasheet, PDF (58/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
■ Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit is set “1”, the output signal is
attenuated by -∞ (“0”) from the value (ATT DATA) set by DVOL7-0 bits during the cycle set by DVTM bit.
When the SMUTE bit is returned to “0”, the mute is cancelled and the output attenuation gradually
changes to ATT DATA from -∞ during the cycle set by DVTM bit. If the soft mute is cancelled within the
cycle set by DVTM bit after starting the operation, the attenuation is discontinued and returned to ATT
DATA. The soft mute is effective for changing the signal source without stopping the signal transaction.
SMUTE bit
ATT DATA
(1)
Attenuation
(1)
(3)
-
Analog Output
GD
GD
(2)
Figure 48. Soft Mute Function
(1)The input signal is attenuated to  (“0”) in the cycle set by DVTM bit. When ATT DATA = +12dB
(DVOL7-0 bits = 00H), 816/fs = 17ms@ fs=48kHz, DVTM bit= “0”.
(2)Analog output corresponding to digital input has group delay (GD).
(3)If soft mute is cancelled before attenuating to , the attenuation is discounted and returned to the
level set by DVOL7-0 bits within the same cycle.
015010680-E-00
- 58 -
2015/09