ak4420 AKM Semiconductor, Inc., ak4420 Datasheet - Page 12

• Manufacturer Part Number: ak4420
• Description: 192khz 24-bit Stereo ?? Dac With 2vrms Output
• Manufacturer: AKM Semiconductor, Inc.

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Soft mute operation is performed in the digital domain. When the SMUTE pin is set “H”, the output signal is attenuated to
-∞ in 1024 LRCK cycles. When the SMUTE pin is returned to “L”, the mute is cancelled and the output attenuation
gradually changes to 0dB in 1024 LRCK cycles. If the soft mute is cancelled within the 1024 LRCK cycles after starting
this operation, the attenuation is discontinued and it is returned to 0dB by the same cycle. Soft mute is effective for
changing the signal source without stopping the signal transmission.
Notes:
MS0683-E-04
Soft Mute Operation
(1) The time for input data be attenuation to -∞, is
(2) The analog output corresponding to a specific digital input has a group delay, GD.
(3) If soft mute is cancelled before attenuating to -∞ after starting the operation, the attenuation is discontinued and
(4) When the input data for both channels are continuously zeros for 8192 LRCK cycles, the DZF pin is set to “H”. The
returned to ATT level in the same cycle.
DZF pin immediately is set to “L” if the input data are not zero after going to DZF “H”.
SMUTE pin
Attenuation
AOUT
DZF pin
Normal Speed Mode: 1024 LRCK cycles (1024/fs).
Double Speed Mode: 2048 LRCK cycles (2048/fs).
Quad Speed Mode : 4096 LRCK cycles (4096/fs).
0dB
-∞
Figure 7. Soft Mute and Zero Detect Function
1024/fs
(1)
8192/fs
(4)
- 12 -
GD
(2)
1024/fs
GD
(3)
[AK4420]
2008/06