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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCM1609APT.B датащи(PDF) 39 Page - Texas Instruments |
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PCM1609APT.B датащи(HTML) 39 Page - Texas Instruments |
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39 / 47 page  www.ti.com S/PDIF Receiver Evaluation Board DEM-DAI1609A PCM1609A(1) 2nd-Order Low-Pass Filter Band Limit A-Weight Filter(1) Analyzer and Display Digital Generator S/PDIF Output 0% Full-Scale, Dither Off (SNR) –60 dB FS, 1-kHz Sine Wave (Dynamic Range) rms Mode HPF = 22 Hz LPF = 22 kHz Option = A-Weighting(2) B0063-03 f–3 dB = 54 kHz fC = 1 kHz Notch Filter IDLE-CHANNEL SIGNAL-TO-NOISE RATIO (SNR) PCM1609A SLES145B – AUGUST 2005 – REVISED MARCH 2008 (1) Infinite-zero-detect mute disabled (2) Results without A-weighting are approximately 3 dB worse. Figure 40. Test Setup for Dynamic Range and SNR Measurements The SNR test provides a measure of the noise of the DAC. The input to the DAC is in all-0s data, and the DAC infinite-zero-detect mute function must be disabled (default condition at power up for the PCM1609A). This ensures that the delta-sigma modulator output is connected to the output amplifier circuit so that idle tones (if present) can be observed at the output. The dither function of the digital signal generator must also be disabled to ensure an all-0s data stream at the input of the DAC. The measurement setup for SNR is identical to that used for dynamic range, with the exception of the input signal level (see the notes in Figure 40). Copyright © 2005–2008, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Link(s): PCM1609A |
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