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ADC3583 Datasheet(PDF) 24 Page - Texas Instruments |
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ADC3583 Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 75 page  8.3.1.2 Analog Front End Design The ADC358x 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 ADC3583 SBAS873 – FEBRUARY 2021 www.ti.com 24 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: ADC3583 |
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