ak4359 AKM Semiconductor, Inc., ak4359 Datasheet - Page 19

• Manufacturer Part Number: ak4359
• Description: 106db 192khz 24-bit 8ch Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
Notes:
MS0289-E-02
Soft Mute Operation
(2) The analog output corresponding to the digital input has a group delay, GD.
(4) When the input data at each channel is continuously zeros for 8192 LRCK cycles, DZF pin of each channel goes to
(1) ATT_DATA×ATT transition time (Table 12). For example, in Normal Speed Mode, this time is 1020LRCK cycles
(3) If the soft mute is cancelled before attenuating to -∞ after starting the operation, the attenuation is discontinued and
(1020/fs) at ATT_DATA=255.
returned to ATT level by the same cycle.
“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.
SMUTE
Attenuation
AOUT
DZF pin
ATT Level
-∞
Figure 11. Soft Mute and Zero Detection (DZFB bit = “0”)
(1)
8192/fs
(4)
- 19 -
GD
(2)
(1)
GD
(3)
[AK4359]
2006/03