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ADC32RF83 データシート(PDF) 28 Page - Texas Instruments

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部品番号 ADC32RF83
部品情報  ADC32RF8x Dual-Channel, 3-GSPS Telecom Receiver and Feedback Devices
PDF  138 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

ADC32RF83 データシート(HTML) 28 Page - Texas Instruments

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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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