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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADC3641 датащи(PDF) 24 Page - Texas Instruments |
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ADC3641 датащи(HTML) 24 Page - Texas Instruments |
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24 / 77 page  8.3.1.2.3 Analog Input Termination and DC Bias Depending on the input drive circuitry, a termination network and/or DC biasing needs to be provided. 8.3.1.2.3.1 AC-Coupling The ADC364x requires external DC bias using the common mode output voltage (VCM) of the ADC together with the termination network as shown in Figure 8-7. The termination is located within the glitch filter network. When using a balun on the input, the termination impedance has to be adjusted to account for the turns ratio of the transformer. When using an amplifier, the termination impedance can be adjusted to optimize the amplifier performance. 100 pF 33 10 0.1 …F 25 33 10 25 180nH 180nH VCM Glitch Filter 1 uF 1 uF VCM Termination Figure 8-7. AC-Coupling: termination network provides DC bias (glitch filter example for DC - 30 MHz) 8.3.1.2.3.2 DC-Coupling In DC coupled applications the DC bias needs to be provided from the fully differential amplifier (FDA) using VCM output of the ADC as shown in Figure 8-8. The glitch filter in this case is located between the anti-alias filter and the ADC. No termination may be needed if amplifier is located close to the ADC or if the termination is part of the anti-alias filter. 100 pF 33 10 33 10 180nH 180nH Glitch Filter AAF (Anti Alias Filter) VCM Figure 8-8. DC-Coupling: DC bias provided by FDA (glitch filter example for DC - 30 MHz) ADC3643 SBAS886 – OCTOBER 2020 www.ti.com 24 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: ADC3643 |
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