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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP3302 датащи(PDF) 16 Page - Microchip Technology |
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MCP3302 датащи(HTML) 16 Page - Microchip Technology |
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16 / 46 page  MCP3302/04 DS21697E-page 16 © 2008 Microchip Technology Inc. 3.7 Analog Ground (AGND) Ground connection to internal analog circuitry. To ensure accuracy, this pin must be connected to the same ground as DGND. If an analog ground plane is available, it is recommended that this device be tied to the analog ground plane in the circuit. See Section 5.6 “Layout Considerations” for more information regarding circuit layout. 3.8 Voltage Reference (VREF) This input pin provides the reference voltage for the device, which determines the maximum range of the analog input signal and the LSB size. The LSB size is determined according to the equation shown below. As the reference input is reduced, the LSB size is reduced accordingly. EQUATION 3-1: When using an external voltage reference device, the system designer should always refer to the manufacturer’s recommendations for circuit layout. Any instability in the operation of the reference device will have a direct effect on the accuracy of the ADC conversion results. 3.9 Power Supply (VDD) The voltage on this pin can range from 2.7 to 5.5V. To ensure accuracy, a 0.1 µF ceramic bypass capacitor should be placed as close as possible to the pin. See Section 5.6 “Layout Considerations” for more information regarding circuit layout. LSB Size = 2 x VREF 8192 |
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