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ADC32RF83 데이터시트(PDF) 28 Page - Texas Instruments |
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ADC32RF83 데이터시트(HTML) 28 Page - Texas Instruments |
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28 / 138 page ![]() INxP INxM RIN TI Device CIN ZIN = RIN || CIN SDD11 = (ZIN ± 100) / (ZIN + 100) Copyright © 2016, Texas Instruments Incorporated 28 ADC32RF80, ADC32RF83 SBAS774A – MAY 2016 – REVISED DECEMBER 2016 www.ti.com Product Folder Links: ADC32RF80 ADC32RF83 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Analog Inputs The ADC32RF8x analog signal inputs are designed to be driven differentially. The analog input pins have internal analog buffers that drive the sampling circuit. The ADC32RF8x 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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