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ADC32RF44IRMPR 데이터시트(PDF) 23 Page - Texas Instruments |
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ADC32RF44IRMPR 데이터시트(HTML) 23 Page - Texas Instruments |
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23 / 135 page ![]() INxP INxM RIN TI Device CIN ZIN = RIN || CIN SDD11 = (ZIN ± 100) / (ZIN + 100) Copyright © 2016, Texas Instruments Incorporated 23 ADC32RF44 www.ti.com SBAS809A – FEBRUARY 2017 – REVISED MARCH 2017 Product Folder Links: ADC32RF44 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 9.3 Feature Description 9.3.1 Analog Inputs The ADC32RF44 analog signal inputs are designed to be driven differentially. The analog input pins have internal analog buffers that drive the sampling circuit. The ADC32RF44 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 58 and Figure 59 show SDD11 at the analog inputs from dc to 5 GHz with a 100-Ω reference impedance. Figure 58. Equivalent Input Impedance Figure 59. SDD11 Over the Input Frequency Range |
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