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AD9212 Datasheet(PDF) 31 Page - Analog Devices |
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AD9212 Datasheet(HTML) 31 Page - Analog Devices |
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31 / 57 page  AD9212 Data Sheet Rev. E | Page 30 of 56 External Reference Operation The use of an external reference may be necessary to enhance the gain accuracy of the ADC or to improve thermal drift charac- teristics. Figure 66 shows the typical drift characteristics of the internal reference in 1 V mode. When the SENSE pin is tied to AVDD, the internal reference is disabled, allowing the use of an external reference. The external reference is loaded with an equivalent 6 kΩ load. An internal reference buffer generates the positive and negative full-scale references, REFT and REFB, for the ADC core. Therefore, the external reference must be limited to a nominal voltage of 1.0 V. 0.02 –0.18 –0.14 –0.10 –0.06 –0.02 –0.16 –0.12 –0.08 –0.04 0 –40 TEMPERATURE (°C) –20 0 2040 6080 Figure 66. Typical VREF Drift |
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