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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP3204 датащи(PDF) 24 Page - Microchip Technology |
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MCP3204 датащи(HTML) 24 Page - Microchip Technology |
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24 / 40 page  MCP3204/3208 DS21298E-page 24 © 2008 Microchip Technology Inc. 6.5 Utilizing the Digital and Analog Ground Pins The MCP3204/3208 devices provide both digital and analog ground connections to provide another means of noise reduction. As shown in Figure 6-5, the analog and digital circuitry is separated internal to the device. This reduces noise from the digital portion of the device being coupled into the analog portion of the device. The two grounds are connected internally through the substrate, which has a resistance of 5 -10Ω. If no ground plane is utilized, then both grounds must be connected to VSS on the board. If a ground plane is available, both digital and analog ground pins should be connected to the analog ground plane. If both an analog and a digital ground plane are available, both the digital and the analog ground pins should be connected to the analog ground plane. Following these steps will reduce the amount of digital noise from the rest of the board being coupled into the A/D converter. FIGURE 6-5: Separation of Analog and Digital Ground Pins. MCP3204/08 Analog Ground Plane DGND AGND V DD 0.1 µF Substrate 5 - 10Ω Digital Side -SPI Interface -Shift Register -Control Logic Analog Side -Sample Cap -Capacitor Array -Comparator |
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