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ADS1178 Datasheet(PDF) 11 Page - Texas Instruments |
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ADS1178 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 35 page  www.ti.com 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 Submit Documentation Feedback 11 Product Folder Link(s): ADS1174 ADS1178 |
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