AK4440 Datasheet, PDF (18/31 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit 8ch DAC with 2Vrms Output

[AK4440]
DEM1 pin
L
L
H
H
DEM0 pin
L
H
L
H
Mode
44.1kHz
OFF
48kHz
32kHz
(default)
Table 10 De-emphasis Filter Control in Parallel Control Mode (Normal Speed Mode)
■ Soft Mute Operation
Soft mute operation is performed in the digital domain. When the SMUTE pin/bit is set “1”, the output signal is
attenuated to -∞ in 1024 LRCK cycles. When the SMUTE pin/bit is returned to “0”, 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.
SMUTE pin/bit
0dB
Attenuation
1024/fs
(1)
1024/fs
(3)
-∞
GD
GD
(2)
LOUT/ROUT
DZF pin
(4)
8192/f s
Notes:
(1) The time for input data to be attenuated to -∞, is
Normal Speed Mode: 1024 LRCK cycles (1024/fs).
Double Speed Mode: 2048 LRCK cycles (2048/fs).
Quad Speed Mode: 4096 LRCK cycles (4096/fs).
(2) The analog output corresponding to a specific digital input has group delay, GD.
(3) If soft mute is cancelled before attenuating to -∞, the attenuation is discontinued and returned to ATT level in the
same cycle.
Figure 18. Soft Mute Function
MS1088-E-01
- 18 -
2011/03