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MCP3564-E/ST bảng dữ liệu(PDF) 31 Page - Microchip Technology |
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MCP3564-E/ST bảng dữ liệu(HTML) 31 Page - Microchip Technology |
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31 / 108 page  2019-2021 Microchip Technology Inc. DS20006181C-page 31 MCP3561/2/4 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 connected 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 totally independent. Each of these multiplexers includes the same possibilities for the input selection, so that any required combination of input voltages can be converted by the ADC. The analog multiplexer is composed of parallel low-resistance input switches turned on or off depend- ing on the input channel selection. Their resistance is negligible compared 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 VIN+ Analog Multiplexer Delta-Sigma ADC VIN+ VIN- 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 ITEMP+ MUX[7:4] = 1101 REFIN- REFIN+ AVDD AGND CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 TEMP diode M VIN- Analog Multiplexer VCM TEMP diode P AGND TEMP diode M MUX[3:0] = 1101 AVDD ITEMP- MUX[7:4] = 1110 MUX[3:0] =1110 |
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