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MCP3464T-E/ST bảng dữ liệu(PDF) 31 Page - Microchip Technology |
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MCP3464T-E/ST bảng dữ liệu(HTML) 31 Page - Microchip Technology |
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31 / 108 page  2019-2021 Microchip Technology Inc. DS20006180D-page 31 MCP3461/2/4 5.0 DEVICE OVERVIEW 5.1 Analog Input Multiplexer The device includes a fully configurable analog input dual multiplexer that can select which input is con- nected to each of the two differential input pins (VIN+/VIN-) of the Delta-Sigma ADC. The dual multiplexer is divided into two single-ended multiplexers that are completely independent. Each of these multiplexers include the same possibilities for the input selection, so that any required combination of input voltages can be converted by the ADC. The ana- log multiplexer is composed of parallel low-resistance input switches, turned on or off, depending on the input channel selection. Their resistance is negligible com- pared to the input impedance of the ADC (caused by the charge and discharge of the input sampling capacitors on the VIN+/VIN- ADC inputs). The block diagram of the analog multiplexer is shown in Figure 5-1. FIGURE 5-1: Simplified Analog Input Multiplexer Schematic. Analog Input Dual Multiplexer V IN + Analog Multiplexer Delta-Sigma ADC V IN + V IN - VCM TEMP Diode P MUX[7:4] REFIN- REFIN+ AVDD AGND CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 MUX[3:0] AVDD ISOURCE AGND ISINK AGND CS_SEL[1:0] CS_SEL[1:0] AVDD I TEMP + MUX[7:4] = 1101 REFIN- REFIN+ AVDD AGND CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 TEMP Diode M V IN - Analog Multiplexer VCM TEMP Diode P AGND TEMP Diode M MUX[3:0] = 1101 AVDD I TEMP - MUX[7:4] = 1110 MUX[3:0] = 1110 |
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