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AD7982 Datasheet(PDF) 21 Page - Analog Devices |
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AD7982 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 24 page 
AD8475 Rev. B | Page 21 of 24 The differential RC network between the AD8475 output and the ADC provides a single-pole filter that reduces undesirable aliasing effects and high frequency noise. The common-mode bandwidth of the filter is 29.5 MHz (20 Ω, 270 pF), and the differential bandwidth is 3.1 MHz (40 Ω, 1.3 nF). The VOCM input is bypassed for noise reduction, and set externally with 1% resistors to maximize output dynamic range on a single 5 V supply. Figure 54. FFT Results of the AD8475 Driving the AD7982 AD7982 AD8475 20V –10V 0V +10V +7V TO +18V +0.5V +2.5V +4.5V NC NC +IN 0.4x –IN 0.4x +IN 0.8x –IN 0.8x 4V +0.5V 2.5V +4.5V 4V –OUT IN– IN+ +OUT VOCM +VS +5V –VS ADR435 20Ω 20Ω 270pF 270pF 1.3nF VIO CNV GND REF VDD SDO SCK SDI +5V +2.5V +1.8V TO +5V 10kΩ 10kΩ 0.1µF +5V Figure 55. Attenuation and Level Shifting of Industrial Voltages to Drive Single-Supply Precision ADC |
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