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AK4436VN Datasheet, PDF (38/63 Pages) Asahi Kasei Microsystems – 108dB 768kHz 32bit 8-Channel Audio DAC | |||
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[AK4438]
â Soft Mute Operation
The soft mute operation is performed at digital domain. When the SMUTE pin goes to âHâ or set SMUTE
bit to â1â, the output signal is attenuated by ïï¥ during ATT_DATA ï´ ATT transition time from the current
ATT level. When the SMUTE pin is returned to âLâ or the SMUTE bit is returned to â0â, the mute is
cancelled and the output attenuation gradually changes to the ATT level during ATT_DATA ï´ ATT
transition time. If the soft mute is cancelled before attenuating ïï¥, 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)
-ï¥
GD
GD
(2)
(2)
AOUT
DZF pin
(4)
8192/fs
Notes:
(1) ATT_DATA ï´ ATT transition time. For example, this time is 4080LRCK cycles 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 ïï¥ 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 âHâ. The DZF pin immediately returns to âLâ if input data are not zero.
Figure 30. Soft Mute Function and Zero Detection
016001925-E-00
- 38 -
2016/03
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