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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP3464 датащи(PDF) 80 Page - Microchip Technology |
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MCP3464 датащи(HTML) 80 Page - Microchip Technology |
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80 / 108 page  MCP3461/2/4 DS20006180D-page 80 2019-2021 Microchip Technology Inc. 7.4 SPI Interface Digital Crosstalk The MCP3461/2/4 incorporates a high-speed 20 MHz SPI digital interface. This interface can induce crosstalk, especially with the outer channels closer to the SPI digital pins (CH7, for example), if it is running at full speed without any precautions. The crosstalk is caused by the switching noise created by the digital SPI signals. This crosstalk would negatively impact the SNR in this case. The noise is attenuated if proper separation between the analog and digital power supplies is put in place (see Section 7.3 “Power Sup- ply Design and Bypassing”). The switching noise is also a linear function of the DVDD supply voltage. In order to reduce further the influence of the switching noise caused by SPI transmissions, the DVDD digital power supply voltage should be kept as low as possible. In order to further remove the influence of the SPI communication on measurement accuracy, it is recom- mended to add series resistors on the SPI lines to reduce the current spikes caused by the digital switch- ing noise (see Figure 7-1, where these resistors have been implemented). The resistors also help to keep the level of electromagnetic emissions low. The measurement graphs provided in this MCP3461/2/4 data sheet have been performed with 100 series resistors connected on each SPI I/O pin. Measurement accuracy disturbances have not been observed, even at 20 MHz interfacing. |
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