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ADS1192IRSMR Datasheet(PDF) 21 Page - Texas Instruments

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Part # ADS1192IRSMR
Description  Two Low-Noise PGAs and Two High-Resolution ADCs (ADS1192)
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS1192IRSMR Datasheet(HTML) 21 Page - Texas Instruments

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background image
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
Normalized Frequency (f /f
)
IN MOD
0.05
0.1
0
0.5
0.15
0.2
0.25
0.3
0.35
0.4
0.45
DR[0:2] = 000
DR[0:2] = 110
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
Normalized Frequency (f /f
)
IN MOD
0.01
0
0.07
0.02
0.03
0.04
0.05
0.06
DR[0:2] = 110
DR[0:2] = 000
0
-20
-40
-60
-80
-100
-120
-140
Normalized Frequency (f /f
)
IN DR
1
2
0
3
4
5
0.5
4.5
3.5
2.5
1.5
0
0.5
1
1.5
2
2.5
3
-
-
-
-
-
-
Normalized Frequency (f /f
)
IN DR
0.05
0.1
0
0.15
0.35
0.2
0.25
0.3
ADS1191
ADS1192
www.ti.com
SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012
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. 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 ADS1191/2 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. THD vs Frequency
Figure 22. INL vs PGA Gain
Figure 23. Transfer Function of On-Chip
Figure 24. Transfer Function of On-Chip
Decimation Filters Until fMOD/2
Decimation Filters Until fMOD/16
Copyright © 2011–2012, Texas Instruments Incorporated
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21
Product Folder Links: ADS1191 ADS1192


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