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MCP3201 Datasheet(PDF) 22 Page - Microchip Technology |
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MCP3201 Datasheet(HTML) 22 Page - Microchip Technology |
22 / 36 page ![]() MCP3201 DS21290E-page 22 © 2008 Microchip Technology Inc. 6.2 Maintaining Minimum Clock Speed When the MCP3201 initiates the sample period, charge is stored on the sample capacitor. When the sample period is complete, the device converts one bit for each clock that is received. It is important for the user to note that a slow clock rate will allow charge to bleed off the sample cap while the conversion is taking place. At 85°C (worst case condition), the part will maintain proper charge on the sample capacitor for at least 1.2 ms after the sample period has ended. This means that the time between the end of the sample period and the time that all 12 data bits have been clocked out must not exceed 1.2 ms (effective clock frequency of 10 kHz). Failure to meet this criteria may induce linearity errors into the conversion outside the rated specifications. It should be noted that during the entire conversion cycle, the A/D Converter does not require a constant clock speed or duty cycle, as long as all timing specifications are met. 6.3 Buffering/Filtering the Analog Inputs If the signal source for the A/D Converter is not a low impedance source, it will have to be buffered or inaccurate conversion results may occur. See Figure 4-2. It is also recommended that a filter be used to eliminate any signals that may be aliased back into the conversion results. This is illustrated in Figure 6-3 where an op amp is used to drive the analog input of the MCP3201 device. This amplifier provides a low impedance source for the converter input and a low-pass filter, which eliminates unwanted high- frequency noise. Low-pass (anti-aliasing) filters can be designed using Microchip’s interactive FilterLab® software. FilterLab will calculate capacitor and resistor values, as well as determine the number of poles that are required for the application. For more information on filtering signals, see the application note AN699 “Anti-Aliasing Analog Filters for Data Acquisition Systems.” FIGURE 6-3: The MCP601 Operational Amplifier is used to implement a 2nd order anti- aliasing filter for the signal being converted by the MCP3201 device. MCP3201 VDD 10 µF IN- IN+ - + VIN C1 C2 VREF 4.096V Reference 1µF 10 µF 0.1 µF MCP601 R1 R2 R3 R4 MCP1541 CL |
Similar Part No. - MCP3201_08 |
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Similar Description - MCP3201_08 |
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