AK4126 Datasheet, PDF (17/27 Pages) Asahi Kasei Microsystems – 6ch 192kHz / 24-Bit Asynchronous SRC

ASAHI KASEI
[AK4126]
„ Soft Mute Operation
1. Manual mode
The soft mute operation is performed in the digital domain of the SRC output. The soft mute can be controlled by SMUTE
pin. When SMUTE pin goes “H”, all the SRC output data are attenuated by −∞ during 1024 OLRCK cycles (@ SMT1 pin
= “L” and SMT0 pin = “L”). When the SMUTE pin goes “L” the mute is cancelled and the output attenuation gradually
changes to 0dB during 1024 OLRCK cycles (@ SMT1 pin = “L” and SMT0 pin = “L”). If the soft mute is cancelled before
mute state after starting of the operation, the attenuation is discontinued and returned to 0dB by the same cycles. The soft
mute is effective for changing the signal source. Soft mute cycle is selected by SMT1-0 pins. SMT1-0 pins must not be
changed during soft mute transition.
SMT1pin
L
L
H
H
SMT0 pin
Period
fso=48kHz fso=96kHz
L
1024/fso
21.3ms
10.7ms
H
2048/fso
42.7ms
21.3ms
L
4096/fso
85.3ms
42.7ms
H
8192/fso
170.7ms
85.3ms
Table 6. Soft Mute Cycle Setting
fso=192kHz
5.3ms
10.7ms
21.3ms
42.7ms
SMUTE
0dB
(1)
Attenuation
-∞
SDTO
(1)
(2)
Note: SDTO shows SDTO1, SDTO2 and SDTO3.
(1) The soft mute cycle is selected by SMT1-0 pins. (See Table 6) The output data is attenuated by −∞ during the soft mute
cycle.
(2) If the soft mute is cancelled before attenuating to −∞ after starting the operation, the attenuation is discontinued and
returned to 0dB by the same number of clock cycles.
Figure 10. Soft Mute Function (Manual Mode)
MS0544-E-00
- 17 -
2006/09