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AD8401CHIPS Datasheet(PDF) 11 Page - Analog Devices |
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AD8401CHIPS Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD8401 –11– REV. 0 Table III. DAC Unipolar Code Nominal Analog DAC Register Contents General Transfer Decimal Binary Equation Output VOUT 255 1111 1111 2.500 × 255 256 2.490 V 129 1000 0001 2.500 × 129 256 1.260 V 128 1000 0000 2.500 × 128 256 1.250 V 127 0111 1111 2.500 × 127 256 1.240 V 1 0000 0001 2.500 × 1 256 0.010 V 0 0000 0000 2.500 × 0 256 0.000 V APPLICATIONS INFORMATION The software programming needs to format data as defined by the transfer equations and Code Tables that follow. DAC Transfer Equation VOUT = 2.500 × D 256 = 2.500 × 255 256 for a 2.50 V full scale where D is the decimal value 0 through 255 of the 8-bit data word. The nominal output voltages listed in the Code Table are sub- ject to the static performance specifications. The INL, Zero- Scale and Full-Scale errors describe the total specified variation that will be encountered from part to part. One LSB of error for the 2.5 V FS range is 9.766 millivolts (= 2.50/256). Although separate AGNDs exist for both the DAC and ADC to minimize crosstalk, writing data to the DAC while the ADC is performing a conversion may result in an incorrect conversion from the ADC due to signal interaction between the DAC and ADC. Therefore, to ensure correct operation of the ADC, the DAC register should not be updated while the ADC is converting. The AD8401 is configured for an input range of +3.0 volts Full Scale. The nominal transfer characteristic for this range is plot- ted in Figure 23. The output coding is natural binary with one LSB equal to 11.72 millivolts. Note that the first code transition between 0 LSB and 1 LSB occurs at 5.8 mV, one half of the 11.72 mV LSB step size. The last code transition occurs at Full Scale minus 1.5 LSBs, which is a 2.982 V input. The AD8401 is easily interfaced to most microprocessors by us- ing either address bits or address decode to select the appropri- ate multiplexer channel. Figure 24 shows how easily the AD8401 interfaces to the AD899. No additional hardware is required. OUTPUT CODE FULL SCALE TRANSITION 123 FS FS – 1LSB VIN INPUT VOLTAGE – LSBs 1LSB = FS 256 11111111 11111110 11111101 00000011 00000010 00000001 00000000 Figure 23. ADC 0 V to +3 V Input Transfer Characteristic |
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