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CS5372-BS Folha de dados(PDF) 9 Page - Cirrus Logic |
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CS5372-BS Folha de dados(HTML) 9 Page - Cirrus Logic |
9 / 22 page CS5371 CS5372 DS255F3 9 3. MODULATOR PERFORMANCE Figures 4 and 5 illustrate the spectral performance of the CS5371/72 modulators when combined with the CS5376A or CS5378 digital filter. The plots were created from ten averaged 1024 point FFTs. 3.1. Full-scale Signal Performance Figure 4 illustrates the full-scale signal perfor- mance of the CS5371/72 modulators and digital fil- ter using a 31.25 Hz input signal and a 1000 SPS output word rate. The outstanding full-scale signal characteristics of the CS5371/72 modulators are shown, with no harmonic components exceeding - 120 dB. Analysis of this data set yields a signal-to- noise ratio (SNR) of 124.0 dB and a signal-to-dis- tortion ratio (SDR) of 119.0 dB. Note that the full- scale signal peak in Figure 4 shows a slightly re- duced amplitude due to spectral smearing associ- ated with the FFT windowing function, and is a purely digital phenomenon. 3.2. Noise Performance Figure 5 illustrates the noise performance of the CS5371/72 modulators and digital filter using a 31.25 Hz -24 dB input signal at a 1000 SPS output word rate. The outstanding noise characteristics of the CS5371/72 modulators are shown, with the av- eraged noise components consistently below the -150 dB level. Analysis of this data set yields a dy- namic range of 124.7 dB. Note that the 0.7 dB variation between the signal-to-noise calculation in Figure 4 and the dynamic range calculation in Fig- ure 5 is not modulator dependent and results from jitter in the test signal generator when producing a full-scale output, as evidenced by the skirt sur- rounding the signal peak below the -140 dB level in Figure 4. 4. SIGNAL INPUTS The CS5371/72 modulators use a switched capac- itor architecture for the analog signal inputs, which has increased jitter tolerance compared with con- tinuous time signal input stages. 4.1. Differential Inputs - INR+/-, INF+/- The analog signal inputs are differential and use four pins: INR+, INR-, INF+, and INF-. Two inputs, INR+ and INF+, are connected to the positive half of the differential signal, while two inputs, INR- and INF-, are connected to the negative half. The INR+ and INR- pins are switched capacitor ‘rough charge’ inputs that pre-charge the internal sam- pling capacitor before it is connected to the INF+ and INF- fine input pins. The full-scale analog signal span is defined by the voltage applied across the VREF+ and VREF- pins. A 2.5 volt reference input sets full-scale sig- nals as 5 volts peak-to-peak, fully differential. Dif- ferential inputs increase the dynamic range of Figure 4. 1024 Point FFT plot with a 31.25 Hz input at Full-scale, ten averages -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 0 50 100 150 200 250 300 350 400 450 500 Hz S/N = 124.0 dB S/D = 119.0 dB -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 0 50 100 150 200 250 300 350 400 450 500 Hz Dynamic Range = 124.7 dB Figure 5. 1024 Point FFT plot with a 31.25 Hz input at -24 dB, ten averages |
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Descrição semelhante - CS5372-BS |
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