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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP3425 датащи(PDF) 9 Page - Microchip Technology |
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MCP3425 датащи(HTML) 9 Page - Microchip Technology |
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9 / 30 page  © 2007 Microchip Technology Inc. DS22072A-page 9 MCP3425 4.8 Aliasing and Anti-aliasing Filter Aliasing occurs when the input signal contains time- varying signal components with frequency greater than half the sample rate. In the aliasing conditions, the device can output unexpected output codes. For applications that are operating in electrical noise environments, the time-varying signal noise or high frequency interference components can be easily added to the input signals and cause aliasing. Although the MCP3425 device has an internal first order sinc filter, its’ filter response may not give enough attenuation to all aliasing signal components. To avoid the aliasing, an external anti-aliasing filter, which can be accomplished with a simple RC low-pass filter, is typically used at the input pins. The low-pass filter cuts off the high frequency noise components and provides a band-limited input signal to the MCP3425 input pins. |
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