參數(shù)資料
型號: AK4358VQ
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 192 KHZ 24 BIT 8 CH DAC WITH DSD INPUT
中文描述: 192千赫24位8路DAC,具有DSD輸入
文件頁數(shù): 33/35頁
文件大?。?/td> 457K
代理商: AK4358VQ
ASAHI KASEI
[AK4358]
MS0203-E-00
2003/02
- 33 -
4. External Analog Filter
It is recommended by SACD format book (Scarlet Book) that the filter response at SACD playback is an analog low pass
filter with a cut-off frequency of maximum 50kHz and a slop of minimum 30dB/Oct. The AK4358 can achieve this filter
response by combination of the internal filter (Table 18) and an external filter (Figure 27).
Frequency
20kHz
50kHz
100kHz
Gain
-0.4dB
-2.8dB
-15.5dB
Table 18. Internal Filter Response at DSD mode
1.8k
4.3k
1.0k
1.8k
1.0k
4.3k
270p
+Vop
270p
-Vop
AOUT-
AOUT+
3300p
Analog
Out
2.0k
2.0k
2200p
-
+
2.5Vpp
5.65Vpp
2.5Vpp
Figure 27. External 3rd order LPF Circuit Example
Frequency
20kHz
50kHz
100kHz
DC gain = 1.07dB
Gain
-0.05dB
-0.51dB
-16.8dB
Table 19. 3rd order LPF (Figure 27) Response
3.9k
4.7k
R1
3.9k
R1
4.7k
470p
+Vop
470p
-Vop
AOUT-
AOUT+
3900p
When R1=180
fc=90.1kHz, Q=0.735, g=-0.04dB at 40kHz
When R1=150
fc=99.0kHz, Q=0.680, g=-0.23dB at 40kHz
Analog
Out
2.5Vpp
2.5Vpp
6.05Vpp
Figure 28. External 2
nd
order LPF Circuit Example for PCM
相關(guān)PDF資料
PDF描述
AK4359 192 KHZ 24 BIT 8CH DAC
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