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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) 23 Page - Texas Instruments |
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ADC3641 датащи(HTML) 23 Page - Texas Instruments |
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23 / 77 page  8.3.1.2 Analog Front End Design The ADC364x 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 required 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 (assuming 50 Ω source impedance). 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 150nH Figure 8-5. Sampling glitch filter example for input frequencies from 30 to 70 MHz 8.3.1.2.2 Single Ended Input The ADC can be configured to operate with single ended input instead of differential using just the positive signal input. This operating mode must be enabled via SPI register write (address 0x11). The single ended signal is connected to the negative ADC input and both the positive and negative input need to be biased to VCM as shown in Figure 8-6. INM INP R C V CM INM 0V 0.56V -0.56V V CM 0.56V -0.56V V CM C INP V CM C Figure 8-6. Single ended analog input: AC coupled (left) and DC coupled (right) The signal swing is now reduced by 6-dB (single ended input with 1.125 Vpp vs differential 2.25 Vpp), and the resulting SNR is reduced by 3-dB. www.ti.com ADC3643 SBAS886 – OCTOBER 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: ADC3643 |
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