ak4683 AKM Semiconductor, Inc., ak4683 Datasheet - Page 39

• Manufacturer Part Number: ak4683
• Description: Asynchronous Multi-channel Audio Codec With Dir/t
• Manufacturer: AKM Semiconductor, Inc.

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The ADC and DAC have the soft mute function. The soft mute operation is performed at digital domain. When the
SMAD/SMDA bits go to “1”, the output signal is attenuated by -∞ during ATT_DATA×ATT transition time (Table 37,
Table 38) from the current ATT level. When the SMAD/SMDA bits are 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:
MS0427-E-02
(1) ATT_DATA×ATT transition time (Table 37, Table 38). For example, in Normal Speed Mode, this time is
(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
(4) When the input data at all the channels of the group are continuously zeros for 8192 cycles, DZF pin of each
Soft mute operation
SMAD/SMDA bits
Attenuation
AOUT
DZF
1061/fs cycles (1792/fs) at ATT_DATA=00H. ATT transition of the soft-mute is from 00H to FFH
and returned to ATT level by the same cycle.
channel goes to “H”. DZF pin immediately goes to “L” if the input data of either channel of the group are not
zero after going DZF “H”.
(for SMDA)
ATT Level
- ∞
(1)
Figure 20. Soft mute and zero detection
8192/fs
(4)
GD
- 39 -
(2)
(1)
GD
(3)
[AK4683]
2007/04