AK4122A Datasheet, PDF (22/54 Pages) Asahi Kasei Microsystems – 24-Bit 96kHz SRC with DIR

[AK4122A]
■ Soft Mute Operation
Soft mute operation is performed in the digital domain of the SRC output. Soft mute can be controlled by SMUTE bit or
SMUTE pin. The SMUTE bit setting is logically ORed with the SMUTE pin setting. When SMUTE bit goes “1” or
SMUTE pin goes “H”, the SRC output data is attenuated by −∞ within 1024 LRCK cycles. When the SMUTE bit returned
“0” and SMUTE pin goes “L” the mute is cancelled and the output attenuation gradually changes to 0dB during 1024
LRCK cycles. If the soft mute is cancelled before mute state, the attenuation is discontinued and returned to 0dB in the
same cycles. The soft mute is effective for changing the signal source without stopping the signal transmission.
S MU TE
DAT T Level
(1)
A tten u a tion
-∞
(1)
(2)
S DTIO / S DTO
Figure 12. Soft Mute Function
(1) The output data is attenuated by −∞ during 1024 LRCK cycles (1024/fs).
(2) If the soft mute is cancelled before attenuating to −∞, the attenuation is discontinued and returned to 0dB in the same
clock cycles.
MS1076-E-01
- 22 -
2010/05