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參數(shù)資料
| 型號(hào)： | DSD1700E |
| 英文描述： | DIODE - SCHOTTKY, 3A (SMT) |
| 中文描述： | 直接數(shù)字流渠務(wù)署⑩⑩商標(biāo)音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | DSD1700E |
6
DSD1700
D0
R0
D1
R1
D2
R2
D3
R3
D4
R4
D5
R5
D6
R6
D7
R7
I
OUT
FIGURE 7. Analog FIR Filter Structure.
FIGURE 8. Analog FIR Filter Frequency Response.
FREQUENCY RESPONSE
(DC – 1.4112MHz)
Frequency (Hz)
G
705,600
1,411,200
0
0
–50
–100
FREQUENCY RESPONSE
(DC – 11.2896MHz)
Frequency (Hz)
G
5,644,800
11,289,600
0
0
–50
–100
ANALOG FIR FILTER
The low-pass filter function for the DSD1700 is constructed
by using four 8-tap, analog FIR filters with current outputs.
The four filters include one each for HOT and COLD
positive, and one each for HOT and COLD negative. This is
referred to as a double differential architecture. These filters
use resistors to set the filter coefficients, as shown in
Figure 7. Prior to the analog FIR filters, the duty cycle of the
DSD input signal is set to 75% by the DSD1700’s duty
generators.
Plots of the analog FIR filter response is shown in Figure 8.
The stop-band attenuation of the filters dictates that addi-
tional low-pass filtering is required at the output of the
external current-to-voltage converter circuit (see Figure 10).
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