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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP3461RT-E/ST датащи(PDF) 37 Page - Microchip Technology |
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MCP3461RT-E/ST датащи(HTML) 37 Page - Microchip Technology |
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37 / 118 page  2020-2021 Microchip Technology Inc. DS20006404C-page 37 MCP3461/2/4R 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 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 Sigma-Delta ADC VIN+ VIN- VCM TEMP Diode P MUX[7:4] REFIN- REFIN+/OUT AVDD AGND 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+/OUT AVDD AGND 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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