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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS5317-KP датащи(PDF) 9 Page - Cirrus Logic |
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CS5317-KP датащи(HTML) 9 Page - Cirrus Logic |
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9 / 32 page  Initial Sampling The CS5317 samples the analog input, AIN, at one-half the master clock frequency (~2.5 MHz max). The input sampling frequency, fs in, appears at CLKOUT regardless of whether the master clock is generated on-chip (CLKG1 and CLKG2 modes) or driven directly into the CS5317 (CLKOR mode). The digital filter then processes the input signal at the input sample rate. Like any sampled-data filter, though, the digital filter’s passband spectrum repeats around integer multiples of the sample rate, fs in. That is, when the CS5317 is operating at its full-rated speed any noise within ± 5 kHz bands around 2.5 MHz, 5 MHz, 7.5 MHz, etc. will pass unfiltered and alias into the baseband. Such noise can only be filtered by analog filtering before the signal is sampled. Since the signal is heavily oversampled (2.5 MHz : 5 kHz, or 500 : 1), a single-pole passive RC filter can be used as shown in Figure 2. 0 F 2F 3F .25 F .5 F 0 -40 -80 -2.74 dB f sin (128πƒT) 128sin (πƒT) 3 = Magnitude where: T = 1/ ƒsin ƒsin = input sampling frequency = CLKOUT frequency for all modes = CLKIN/2 in CLKOR mode = CLKIN*128 in CLKG1 mode = CLKIN*256 in CLKG2 mode F = ƒsin/128 for all modes ƒ = input frequency ƒsout = ƒsin/128 = output data rate for CLKOR & CLKG1 = F ƒsout = ƒsin/256 = output data rate for CLKG2 = F/2 Examples: For ƒsin = 2.56 MHz at ƒ = 5 kHz: Magnitude is -2.74 dB For ƒsin = 2.56 MHz at ƒ = 10 kHz: Magnitude is -11.8 dB Figure 3. CS5317 Low-Pass Filter Response Mag H(ejω ) (dB) 1.2 K 0.01 µF AIN Input Signal Note: Any nonlinearities contributed by this filter will be encoded as distortion by the CS5317. Therefore a low distortion, high frequency ca- pacitor such as COG-ceramic is recommended. Figure 2. Anti-alias Filter CS5317 DS27F4 9 |
Аналогичный номер детали - CS5317-KP |
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Аналогичное описание - CS5317-KP |
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