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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCM1602 датащи(PDF) 26 Page - Texas Instruments |
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PCM1602 датащи(HTML) 26 Page - Texas Instruments |
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26 / 29 page  PCM1602 26 SBAS163 PCB LAYOUT GUIDELINES A typical PCB floor plan for the PCM1602 is shown in Figure 16. A ground plane is recommended, with the analog and digital sections being isolated from one another using a split or cut in the circuit board. The PCM1602 should be oriented with the digital I/O pins facing the ground plane split/cut to allow for short, direct connections to the digital audio interface and control signals originating from the digital section of the board. 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 performance of the DACs. In cases where a common +5V supply must be used for the analog and digital sections, an inductance (RF choke, ferrite bead) should be placed between the analog and digital +5V supply connections to avoid coupling of the digital switching noise into the analog circuitry. Figure 17 shows the recommended approach for single-supply applications. FIGURE 16. Recommended PCB Layout. FIGURE 17. Single-Supply PCB Layout. PCM1602 V CC V DD DGND Return Path for Digital Signals Analog Ground Digital Ground AGND Output Circuits DIGITAL SECTION ANALOG SECTION Digital Logic and Audio Processor Digital Power +V D DGND Analog Power +5V A +V S AGND REG –V S PCM1602 V CC V DD DGND Output Circuits RF Choke or Ferrite Bead Common Ground AGND DIGITAL SECTION ANALOG SECTION V DD Power Supplies +5V +V S GND REG –V S Digital Logic and Audio Processor |
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