ak4121 AKM Semiconductor, Inc., ak4121 Datasheet - Page 11

• Manufacturer Part Number: ak4121
• Description: Asynchronous Sample Rate Converter
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
T Soft Mute Operation
When the SMUTE pin goes to “H”, the output signal is attenuated from 0dB to
When the SMUTE pin returns to “0”, the mute is cancelled and the attenuation gradually changes to 0dB during 1024
OLRCK cycles. If the soft mute is cancelled before attenuating to
This return takes the same number of clock cycles as the point at which the soft mute cancel was initiated, i.e. if 500
clock cycles passed and then a soft mute cancel was issued, it will take 500 clock cycles to return to 0dB. The soft mute
is used primarily when changing the signal source.
Notes:
T De-emphasis Filter
A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc=50/15µs) and is enabled or disabled
with DEM0 and DEM1.
MS0191-E-03
(1) Transition time. 1024 OLRCK cycles (1024/fso).
(2) If the soft mute is cancelled before attenuating to
Attenuation Level
SMUTE
and returned to 0dB by the same number of clock cycles.
at SDTO
-
0dB
dB
Table 4. De-emphasis Filter Control
DEM1
0
0
1
1
(1)
Figure 4. Soft Mute
DEM0
- 11 -
0
1
0
1
after starting the operation, the attenuation is discontinued
44.1kHz
48kHz
32kHz
Mode
OFF
, the attenuation is discontinued and returns to 0dB.
Default
(1)
dB during 1024 OLRCK cycles.
(2)
[AK4121]
2004/08