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ADC31RF80 Datasheet(PDF) 28 Page - Texas Instruments |
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ADC31RF80 Datasheet(HTML) 28 Page - Texas Instruments |
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28 / 142 page  INP INM RIN TI Device CIN ZIN = RIN || CIN SDD11 = (ZIN ± 100) / (ZIN + 100) Copyright © 2016, Texas Instruments Incorporated 28 ADC31RF80 SBAS860 – AUGUST 2017 www.ti.com Product Folder Links: ADC31RF80 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Analog Inputs The ADC31RF80 analog signal inputs are designed to be driven differentially. The analog input pins have internal analog buffers that drive the sampling circuit. The ADC31RF80 provides on-chip, differential termination to minimize reflections. The buffer also helps isolate the external driving circuit from the internal switching currents of the sampling circuit, thus resulting in a more constant SFDR performance across input frequencies. The common-mode voltage of the signal inputs is internally biased to CM using the 32.5- Ω termination resistors that allow for ac-coupling of the input drive network. Figure 80 and Figure 81 show SDD11 at the analog inputs from dc to 5 GHz with a 100-Ω reference impedance. Figure 80. Equivalent Input Impedance Figure 81. SDD11 Over the Input Frequency Range |
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