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| 型号： | PADS1298CZXGT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA64 |
| 封装： | 8 X 8 MM, LEAD FREE, PLASTIC, NFBGA-64 |
| 文件页数： | 15/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
0
-
20
-
40
-
60
-
80
-
100
-
120
-
140
NormalizedFrequency(f /f
)
IN DR
Gain(dB)
1.0
2.0
0
3.0
4.0
5.0
0.5
4.5
3.5
2.5
1.5
0
0.5
1.0
1.5
2.0
2.5
3.0
-
NormalizedFrequency(f /f
)
IN DR
Gain(dB)
0.05
0.10
0
0.15
0.35
0.20
0.25
0.30
0
20
40
60
80
100
120
140
-
NormalizedFrequency(f /f
)
IN MOD
Gain(dB)
0.05 0.10
0
0.50
0.15 0.20 0.25 0.30 0.35 0.40 0.45
DR[2:0]=110
DR[2:0]=000
0
20
40
60
80
100
120
140
-
NormalizedFrequency(f /f
)
IN MOD
Gain(dB)
0.01
0
0.07
0.02
0.03
0.04
0.05
0.06
DR[2:0]=000
DR[2:0]=110
10
30
50
70
90
110
130
-
NormalizedFrequency(f /f
)
IN MOD
Gain(dB)
0.5
0
4.0
1.0
1.5
2.0
2.5
3.0
3.5
DR[2:0]=110
DR[2:0]=000
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
www.ti.com
The sinc filter has notches (or zeroes) that occur at the output data rate and multiples thereof. At these
frequencies, the filter has infinite attenuation. Figure 14 shows the frequency response of the sinc filter and
Figure 15 shows the roll-off of the sinc filter. With a step change at input, the filter takes 3 × tDR to settle. After a
rising edge of the START signal, the filter takes tSETTLE time to give the first data output. The settling time of the
filters at various data rates are discussed in the START subsection of the SPI Interface section. Figure 16 and
Figure 17 show the filter transfer function until fMOD/2 and fMOD/16, respectively, at different data rates. Figure 18
shows the transfer function extended until 4 × fMOD. It can be seen that the passband of the ADS1294/6/8
repeats itself at every fMOD. The input R-C anti-aliasing filters in the system should be chosen such that any
interference in frequencies around multiples of fMOD are attenuated sufficiently.
Figure 14. Sinc Filter Frequency Response
Figure 15. Sinc Filter Roll-Off
Figure 16. Transfer Function of On-Chip
Figure 17. Transfer Function of On-Chip
Decimation Filters Until fMOD/2
Decimation Filters Until fMOD/16
Figure 18. Transfer Function of On-Chip Decimation Filters
Until 4fMOD for DR[2:0] = 000 and DR[2:0] = 110
22
Copyright 2010, Texas Instruments Incorporated
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