AK4527B Datasheet, PDF (19/33 Pages) Asahi Kasei Microsystems – HIGH PERFORMANCE MULTI-CHANNEL AUDIO CODEC

ASAHI KASEI
[AK4527B]
n Soft mute operation
Soft mute operation is performed at digital domain. When the SMUTE pin goes to “H”, the output signal is attenuated by
-∞ during 1024 LRCK cycles. When the SMUTE pin is returned to “L”, the mute is cancelled and the output attenuation
gradually changes to 0dB during 1024 LRCK cycles. If the soft mute is cancelled within 1024 LRCK cycles after starting
the operation, the attenuation is discontinued and returned to 0dB. The soft mute is effective for changing the signal
source without stopping the signal transmission.
SMUTE
0dB
Attenuation
1024/fs
(1)
1024/fs
(3)
-∞
GD
GD
(2)
AOUT
DZF1,2
(4)
8192/fs
Notes:
(1) The output signal is attenuated by -∞ during 1024 LRCK cycles (1024/fs).
(2) Analog output corresponding to digital input have the group delay (GD).
(3) If the soft mute is cancelled within 1024 LRCK cycles, the attenuation is discontinued and returned to 0dB.
(4) When the input data of all channels in the group are continuously zeros for 8192 LRCK cycles, DZF pin
corresponding to the group goes to “H”. DZF pin immediately goes to “L” if input data of any channel in the group
is not zero after going DZF “H”.
Figure 5. Soft mute and zero detection
n System Reset
The AK4527B should be reset once by bringing PDN = “L” upon power-up. The AK4527B is powered up and the
internal timing starts clocking by LRCK “↑” after exiting reset and power down state by MCLK. The AK4527B is in the
power-down mode until MCLK and LRCK are input.
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