ADC3583 datasheet(24/75 Pages) TI

tên linh kiện	ADC3583

Giải thích chi tiết về linh kiện	ADC358x 18-bit 0.5 MSPS to 65 MSPS Low Noise Ultra-low Power ADC

PDF	75 Pages

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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

180nH

Termination

Figure 8-4. Sampling glitch filter example for input frequencies from DC to 30 MHz

Termination

82 pF

120nH

100pF

120nH

100pF

Figure 8-5. Sampling glitch filter example for input frequencies from 30 to 70 MHz

ADC3583

SBAS873 – FEBRUARY 2021

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ADC3583 bảng dữ liệu(PDF) 24 Page - Texas Instruments