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MCP3564-E/ST 数据表(PDF) 39 Page - Microchip Technology |
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MCP3564-E/ST 数据表(HTML) 39 Page - Microchip Technology |
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39 / 108 page  2019-2021 Microchip Technology Inc. DS20006181C-page 39 MCP3561/2/4 FIGURE 5-5: One-Shot Mode vs. Continuous Mode. Since the converter is effectively doing two conversions when the AZ_MUX bit is enabled, the conversion time is equal to 2 * TCONV in this mode. As described in Section 5.1.3 “ADC Offset Cancellation Algorithm”, this selection is not compatible with the Continuous Conversion mode, and therefore, the output data rate is equal to 1/(2 * TCONV) in this mode. Table 5-6 summarizes the possible filter settings and their associated Conversion Time, TCONV, as well as their output data rate (DRCLK) in Continuous mode. When OSR is larger than 20480 for typical master clock frequency, MCLK = 4.9152 MHz, the device includes an additional 50/60 Hz rejection by aligning decimation filter notches with a multiple of 50/60 Hz depending on the OSR setting. The rejection band strongly depends on the master clock accuracy and corresponds to a first-order decimation filter rejection rate. The high OSR settings can be used for applications requiring very low noise and slow data rates. Figure 5-6 shows the frequency response of the deci- mation filter with default settings. Figure 5-7 represents the frequency response of the filter with the highest OSR settings and a line rejection at 60 Hz. TCONV One-Shot mode Conversions are Serialized, Filter is Reset After Each Conversion Group Delay: TCONV Data Rate: 1/(TCONV) Conversion1 TCONV Continuous mode Conversions are Pipelined, Filter is Never Reset Group Delay: TCONV Data Rate: DRCLK TCONV Conversion2 TCONV Conversion3 Conversion3 1/DRCLK TCONV Analog Input Signal Conversion1 Conversion2 TCONV = Settling Time IRQ ADC Status ADC Status IRQ |
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