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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCM1741E/2K датащи(PDF) 18 Page - Texas Instruments |
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PCM1741E/2K датащи(HTML) 18 Page - Texas Instruments |
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18 / 24 page  PCM1741 18 SBAS175 FIGURE 14. 8-Level Delta-Sigma Modulator. + Z–1 8-Level Quantizer + Z–1 + Z–1 – + Z–1 + + 8f S 64f S PCM1741 V CC V DD DGND Output Circuits RF Choke or Ferrite Bead Common Ground AGND DIGITAL SECTION ANALOG SECTION V DD Power Supplies +3.3V +V S AGND REG –V S FIGURE 13. Single-Supply PCB Layout. Separate power supplies are recommended for the digital and analog sections of the board. This prevents the switching noise present on the digital supply from contaminating the analog power supply and degrading the dynamic perfor- mance of the PCM1741. In cases where a common +3.3V supply must be used for the analog and digital sections, an inductance (RF choke, ferrite bead) should be placed be- tween the analog and digital +3.3V supply connections to avoid coupling of the digital switching noise into the analog circuitry. Figure 13 shows the recommended approach for single-supply applications. THEORY OF OPERATION The delta-sigma section of the PCM1741 is based on an 8-level amplitude quantizer and a fourth-order noise shaper. This section converts the oversampled input data to 8-level delta-sigma format. A block diagram of the 8-level delta-sigma modulator is shown in Figure 14. This 8-level delta-sigma modulator has the advantage of stability and clock jitter sensitivity over the typical one-bit (2-level) delta-sigma modulator. The combined oversampling rate of the delta-sigma modulator and the interpo- lation filter is 64fS. |
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