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參數資料
| 型號： | AKD4525 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 20BIT STEREO ADC & DAC WITH X TAL OSC |
| 中文描述： | 20位立體聲ADC |
| 文件頁數： | 12/18頁 |
| 文件大小： | 152K |
| 代理商： | AKD4525 |
ASAHI KASEI
[AK4525]
MS0053-E-00
2000/9
- 12 -
n
De-emphasis Filter
The DAC of AK4525 includes the digital de-emphasis filter (tc=50/15μs) by IIR filter. This filter corresponds to three
frequencies (32kHz, 44.1kHz and 48kHz). The de-emphasis filter selected by DEM0 and DEM1 is enabled for input
audio data. The de-emphasis is also disabled at DEM0= “1” and DEM1= “0”.
DEM1
0
0
1
1
DEM0
0
1
0
1
Mode
44.1kHz
OFF
48kHz
32kHz
Table 3. De-emphasis filter control
n
Soft Mute Operation
Soft mute operation is performed at digital domain. When SMUTE goes to “H”, the output signal is attenuated by -
∞
during 1024 LRCK cycles. When SMUTE 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
Attenuation
1024/fs
(1)
0dB
-
∞
1024/fs
GD
(2)
GD
(3)
-100dB
Noise level
Notes:
(1) The output signal is attenuated by -
∞
during 1024 LRCK cycles (1024/fs).
(2) Analog output corresponding to digital input has the group delay (GD).
(3) If the soft mute is cancelled within 1024 LRCK cycles, the attenuation is discontinued and returned to 0dB.
Figure 6. Soft Mute Operation
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