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MCP3465R Datasheet(PDF) 43 Page - Microchip Technology |
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MCP3465R Datasheet(HTML) 43 Page - Microchip Technology |
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43 / 110 page  2020-2021 Microchip Technology Inc. DS20006414C-page 43 MCP3465R 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; 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. TABLE 5-6: OVERSAMPLING RATIO AND SINC FILTER RELATIONSHIP OSR[3:0] OSR3 OSR1 Total OSR ADC Resolution in Bits (No Missing Codes) Conversion Time (TCONV) Data Rate in Continuous Conversion Mode Data Rate (Hz) with MCLK = 4.9152 MHz Fastest Data Rate (Hz) with MCLK = 19.6608 MHz 000 0 32 1 32 16 96/DMCLK 38400 153600 000 1 64 1 64 16 192/DMCLK 19200 76800 001 0 128 1 128 16 384/DMCLK 9600 38400 001 1 256 1 256 16 768/DMCLK 4800 19200 010 0 512 1 512 16 1536/DMCLK 2400 9600 010 1 512 2 1024 16 2048/DMCLK 1200 4800 011 0 512 4 2048 16 3072/DMCLK 600 2400 011 1 512 8 4096 16 5120/DMCLK 300 1200 100 0 512 16 8192 16 9216/DMCLK 150 600 100 1 512 32 16384 16 17408/DMCLK 75 300 101 0 512 40 20480 16 21504/DMCLK 60 240 101 1 512 48 24576 16 25600/DMCLK 50 200 110 0 512 80 40960 16 41984/DMCLK 30 120 110 1 512 96 49152 16 50176/DMCLK 25 100 111 0 512 160 81920 16 82944/DMCLK 15 60 111 1 512 192 98304 16 99328/DMCLK 12.5 50 |
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