參數(shù)資料
型號: DSD1702E
英文描述: ENHANCED MULTIFORMAT, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER
中文描述: 增強的多格式,Δ-Σ,音頻數(shù)字模擬轉(zhuǎn)換器
文件頁數(shù): 22/28頁
文件大?。?/td> 417K
代理商: DSD1702E
DSD1702
SLES005A
JUNE 2001
REVISED FEBRUARY 2002
22
www.ti.com
APPLICATION INFORMATION
D/A output filter circuits: post low-pass filter
The DSD1702 requires a third or second-order analog low-pass filter to achieve the frequency response
recommended by SACD standard and reduce the out-of-band noise both produced by the DSD1702
delta-sigma modulator and inherent in the DSD modulated input signal.
Figure 12 shows the recommended external low-pass filter circuit. This circuit is a 3rd order Butterworth filter
using the Sallen-Key circuit arrangement. The filter response and corner frequency are determined by the
frequency response recommended by SACD standard. The table in Figure 12 lists the standard resistor and
capacitor values corresponding with the DSD digital filter on DSD1702. This filter can be used in PCM and DSD
modes.
_
+
C3
R3
C2
R2
C1
R1
R1
R2
R3
R4
R5
C1
C2
C3
2.7 k
6.8 k
15 k
10 k
10 k
1500 pF
680 pF
100 pF
DSD Filter
R5
R4
Figure 12. Post Low-Pass Filter Circuit
相關(guān)PDF資料
PDF描述
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