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ADC3561 数据表(PDF) 30 Page - Texas Instruments

部件名 ADC3561
功能描述  ADC356x 16-Bit, 0.5-MSPS to 65-MSPS, Low-Noise, Low Power ADC
PDF  85 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

ADC3561 数据表(HTML) 30 Page - Texas Instruments

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8.3.1.2 Analog Front End Design
The ADC356x is an unbuffered ADC and thus a passive kick-back filter is recommended to absorb the glitch
from the sampling operation. Depending on if the input is driven by a balun or a differential amplifier with low
output impedance, a termination network may be needed. Additionally a passive DC bias circuit is needed in
AC-coupled applications which can be combined with the termination network.
8.3.1.2.1 Sampling Glitch Filter Design
The front end sampling glitch filter is designed to optimize the SNR and HD3 performance of the ADC. The filter
performance is dependent on input frequency and therefore the following filter designs are recommended for
different input frequency ranges as shown in Figure 8-4 and Figure 8-5.
100 pF
33
10
33
10
180nH
180nH
Termination
Figure 8-4. Sampling glitch filter example for input frequencies from DC to 30 MHz
Termination
82 pF
33
10
10
120nH
100pF
33
120nH
100pF
Figure 8-5. Sampling glitch filter example for input frequencies from 30 to 70 MHz
ADC3561, ADC3562, ADC3563
SBAS990B – FEBRUARY 2021 – REVISED OCTOBER 2022
www.ti.com
30
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: ADC3561 ADC3562 ADC3563



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