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CS5371 データシート(PDF) 9 Page - Cirrus Logic |
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CS5371 データシート(HTML) 9 Page - Cirrus Logic |
9 / 22 page CS5371/CS5372 DS255PP2 9 3. MODULATOR PERFORMANCE Figures 4 and 5 illustrate the spectral performance of the CS5371/CS5372 modulators when com- bined with the CS5376 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/CS5372 modulators and CS5376 digital filter using a 31.25 Hz input signal and a 1000 sps output word rate. The outstanding full-scale signal characteristics of the CS5371/CS5372 modulators are shown, with no harmonic components exceeding -120 dB. Analy- sis of this data set yields a signal-to-noise ratio (SNR) of 124.0 dB and a signal-to-distortion ratio (SDR) of 119.0 dB. Note that the full-scale signal peak in Figure 4 shows a slightly reduced ampli- tude due to spectral smearing associated with the FFT windowing function, and is a purely digital phenomenon. 3.2. Noise Performance Figure 5 illustrates the noise performance of the CS5371/CS5372 modulators and CS5376 digital filter using a 31.25 Hz -24 dB input signal and a 1000 sps output word rate. The outstanding noise characteristics of the CS5371/CS5372 modulators are shown, with the averaged noise components consistently below the -150 dB level. Analysis of this data set yields a dynamic 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 Figure 5 is not modulator de- pendent and results from jitter in the test signal generator when producing a full scale output, as ev- idenced by the skirt surrounding the signal peak be- low the -140 dB level in Figure 4. 4. SIGNAL INPUTS The CS5371/CS5372 modulators use a switched capacitor architecture for the analog signal inputs, which has increased jitter tolerance relative to 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-. The posi- tive inputs, INR+ and INF+, are connected to the positive half of the differential signal, while the negative inputs, INR- and INF-, are connected to 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 |
同様の部品番号 - CS5371 |
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同様の説明 - CS5371 |
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