AK4359_06 Datasheet, PDF (19/33 Pages) Asahi Kasei Microsystems – 106dB 192kHz 24-Bit 8ch DAC

ASAHI KASEI
[AK4359]
„ Soft Mute Operation
Soft mute operation is performed at digital domain. When the SMUTE bit goes to “1”, the output signal is attenuated by
-∞ during ATT_DATA×ATT transition time (Table 12) from the current ATT level. When 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 to -∞ after starting the operation, 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
ATT Level
(1)
Attenuation
(1)
(3)
-∞
GD
GD
(2)
AOUT
DZF pin
(4)
8192/fs
Notes:
(1) ATT_DATA×ATT transition time (Table 12). For example, in Normal Speed Mode, this time is 1020LRCK cycles
(1020/fs) at ATT_DATA=255.
(2) The analog output corresponding to the digital input has a group delay, GD.
(3) If the soft mute is cancelled before attenuating to -∞ after starting the operation, the attenuation is discontinued and
returned to ATT level by the same cycle.
(4) When the input data at each channel is continuously zeros for 8192 LRCK cycles, DZF pin of each channel goes to
“H”. DZF pin immediately goes to “L” if input data are not zero after going DZF “H”. In parallel control mode, the
DZF pin is fixed to “L” regardless of the state of SMUTE pin.
Figure 11. Soft Mute and Zero Detection (DZFB bit = “0”)
MS0289-E-02
- 19 -
2006/03