參數(shù)資料
型號(hào)： ADS1194CZXGT
廠商： TEXAS INSTRUMENTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PBGA64
封裝： 8 X 8 MM, GREEN, PLASTIC, NFBGA-64
文件頁(yè)數(shù)： 17/76頁(yè)
文件大小： 1193K
代理商： ADS1194CZXGT
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
SBAS471B
– APRIL 2010 – REVISED APRIL 2011
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 21 shows the frequency response of the sinc filter and
Figure 22 shows the roll-off of the sinc filter. With a step change at input, the filter takes 3
× tDR to settle. The
fourth DRDY pulse is settled data. 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 23 and Figure 24 show the filter transfer function until fMOD/2 and fMOD/16,
respectively, at different data rates. Figure 25 shows the transfer function extended until 4
× fMOD. It can be seen
that the passband of the ADS1194/6/8 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 21. Sinc Filter Frequency Response
Figure 22. Sinc Filter Roll-Off
Figure 23. Transfer Function of On-Chip
Figure 24. Transfer Function of On-Chip
Decimation Filters Until fMOD/2
Decimation Filters Until fMOD/16
Figure 25. Transfer Function of On-Chip Decimation Filters
Until 4fMOD for DR[2:0] = 000 and DR[2:0] = 110
24
Copyright
2010–2011, Texas Instruments Incorporated
Product Folder Link(s): ADS1194 ADS1196 ADS1198
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