參數(shù)資料
型號(hào): AK4357
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 192kHz 24-Bit 6ch DAC with DSD Input
中文描述: 192kHz的24位6通道DAC,具有DSD輸入
文件頁(yè)數(shù): 25/27頁(yè)
文件大小: 195K
代理商: AK4357
ASAHI KASEI
[AK4357]
MS0088-E-02
2002/07
- 25 -
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 AK4357 can achieve this filter response
by combination of the internal filter (Table 14) and an external filter (Figure 14).
Frequency
20kHz
50kHz
100kHz
Table 14. Internal Filter Response at DSD mode
Gain
-0.4dB
-2.8dB
-15.5dB
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
47u
47u
2200p
-
+
2.5Vpp
5.65Vpp
2.5Vpp
Figure 14. External 3rd order LPF Circuit Example
Frequency
20kHz
50kHz
100kHz
DC gain = 1.07dB
Table 15. 3rd order LPF (Figure 14) Response
Gain
-0.05dBr
-0.51dBr
-16.8dBr
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