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ADS1174IPAPR 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 ADS1174IPAPR
상세설명  Quad/Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converters
PDF  35 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

ADS1174IPAPR 데이터시트(HTML) 11 Page - Texas Instruments

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FREQUENCY RESPONSE
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
NormalizedInputFrequency(f /f
IN
T
DA A)
0.45
0.47
0.49
0.51
0.53
0.55
0
-20
-40
-60
-80
-100
-120
-140
0.4
NormalizedInputFrequency(f
IN/fDATA)
0
0.2
0.6
0.8
1.0
20
0
-20
-40
-60
-80
-100
-120
-140
-160
InputFrequency(f /f
IN DATA)
0
16
32
48
64
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0.2
NormalizedInputFrequency(f /f
IN DATA)
0
0.1
0.3
0.4
0.5
0.6
ADS1174
ADS1178
SBAS373 – OCTOBER 2007
The digital filter sets the overall frequency response.
The filter uses a multi-stage FIR topology to provide
linear phase with minimal passband ripple and high
stop band attenuation. The oversampling ratio of the
digital filter (that is, the ratio of the modulator
sampling to the output data rate: fMOD/fDATA) is 64 for
both High-Speed and Low-Power modes.
Figure 2 shows the frequency response of the
ADS1174/78 normalized to fDATA. Figure 3 shows the
passband ripple. The transition from passband to stop
band is illustrated in Figure 4. The overall frequency
response repeats at 64x multiples of the modulator
frequency fMOD, as shown in Figure 5.
Figure 4. Transition Band Response
Figure 2. Frequency Response
Figure 5. Frequency Response Out to fMOD
These image frequencies, if present in the signal and
not externally filtered, will fold back (or alias) into the
passband, causing errors. Table 2 lists the degree of
image rejection versus external antialiasing filter
order. The stop band of the ADS1174/78 provides
100dB attenuation of frequencies that begin just
beyond the passband and continue out to fMOD.
Placing an antialiasing, low-pass filter in front of the
ADS1174/78 inputs is recommended to limit possible
high-amplitude, out-of-band signals and noise.
Table 2. Antialiasing Filter Order Image Rejection
ANTIALIASING FILTER
IMAGE REJECTION (dB)
ORDER
(f–3dB at fDATA)
Figure 3. Passband Response
1
39
2
75
3
111
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): ADS1174 ADS1178



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