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AD7982 Datasheet(PDF) 15 Page - Analog Devices |
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AD7982 Datasheet(HTML) 15 Page - Analog Devices |
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AD7982 Data Sheet Rev. D | Page 14 of 25 Transfer Functions The ideal transfer characteristic for the AD7982 is shown in Figure 22 and Table 8. 100...000 100...001 100...010 011...101 011...110 011...111 ANALOG INPUT +FSR – 1.5 LSB +FSR – 1 LSB –FSR + 1 LSB –FSR –FSR + 0.5 LSB Figure 22. ADC Ideal Transfer Function Characteristic Table 8. Output Codes and Ideal Input Voltages Description Analog Input VREF = 5 V Digital Output Code (Hex) FSR – 1 LSB +4.999962 V 0x1FFFF1 Midscale + 1 LSB +38.15 μV 0x00001 Midscale 0 V 0x00000 Midscale – 1 LSB −38.15 μV 0x3FFFF –FSR + 1 LSB −4.999962 V 0x20001 –FSR −5 V 0x200002 1 This is also the code for an overranged analog input (VIN+ − VIN− above VREF − VGND). 2 This is also the code for an underranged analog input (VIN+ − VIN− below VGND). TYPICAL CONNECTION DIAGRAM Figure 23 shows an example of the recommended connection diagram for the AD7982 when multiple supplies are available. 2.7nF 20Ω V– 0 TO VREF V+ 4 2.7nF 20Ω V– VREF TO 0 V+ 4 10µF2 REF1 REF VDD VIO GND IN+ IN– SDI SCK SDO CNV AD7982 100nF 100nF 3-WIRE INTERFACE 2.5V 1.8V TO 5V V+ ADA4807-12, 3 NOTES 1SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION. 2CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R). SEE RECOMMENDED LAYOUT FIGURE 41 AND FIGURE 42. 3SEE DRIVER AMPLIFIER CHOICE SECTION. 4OPTIONAL FILTER. SEE ANALOG INPUT SECTION. Figure 23. Typical Application Diagram with Multiple Supplies |
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