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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ADL5567ACPZN-R7 Datenblatt(PDF) 18 Page - Analog Devices |
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ADL5567ACPZN-R7 Datenblatt(HTML) 18 Page - Analog Devices |
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18 / 23 page  ADL5567 Data Sheet Rev. A | Page 18 of 23 –10.0 –5.0 0 5.0 10.0 15.0 20.0 25.0 27.5 22.5 17.5 12.5 7.5 2.5 –2.5 –7.5 FREQUENCY (Hz) 10M 100M 1G 10G CLD = 0pF CLD = 3pF, RSE = 0Ω CLD = 1.5pF, RSE = 0Ω CLD = 3pF, RSE = 15Ω CLD = 1.5pF, RSE = 15Ω Figure 47. Frequency Response for Various Load Capacitances, VS = 5 V, High Performance Mode, RL = 200 Ω ADC INTERFACING A wideband data acquisition system (AD-FMCADC7-EBZ) using the ADL5567 together with the AD9625 2.6 GSPS, 12-bit ADC is shown in Figure 51. The RC filter after the amplifier works with the pole formed by the ADC input capacitance to attenuate the broadband noise and out-of-band harmonics generated by the amplifier, as well as blocking the sharp switching pulses from reaching the amplifier outputs and creating nonlinear effects. Component values for different acquisition bandwidth are listed in Table 6. An additional filter more specific to the system rejection requirements is also needed ahead of the ADL5567 amplifier to prevent unwanted signals from compressing the amplifier as well as from reaching the ADC. The signal-to-noise ratios with respect to full scale of the ADC system (SNR FS), using various sources for sampling clock on several circuit boards (such as the BRD-2, BRD-4, or BRD-5) are shown in Figure 48. Two-tone intermodulation distortion performance is shown in Figure 49, and the relative frequency responses for this ADC system with different output filter capacitors, are shown in Figure 50. 50 51 52 53 54 55 56 57 58 59 0 200 400 600 800 1000 1200 1400 1600 1800 2000 FREQUENCY (MHz) AD9625 DATASHEET BRD-4, AC-COUPLED, CRYSTEK, ADF, CLK BRD-5, DC-COUPLED, ON-BOARD, OSC, CLKAMP, ADC BRD-5, DC-COUPLED, CRYSTEK, 2.5GHz BRD-2, AC-COUPLED, CRYSTEK, 2.6GHz, ADC BRD-5, DC-COUPLED, CRYSTEK BRD-3, DC-COUPLED, 2.5GHz, CRYSTEK BRD-4, AC-COUPLED, SMA-CLK BRD-8, DC-COUPLED, CRYSTEK, ADF, CLK BRD-4, AC-COUPLED, CRYSTEK, 2.5GHz, CLK BRD-5, DC-COUPLED, BALUN CRYSTEK, 2.5GHz BRD-5, DC-COUPLED, SIG-GEN BRD-5, DC-COUPLED, ADF BRD-2, REVB, FINAL Figure 48. ADC System SNR (Referred to Full Scale) –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0 0 200 400 600 800 1000 1200 1400 1600 1800 FREQUENCY (MHz) BRD-5, DC-COUPLED BRD-4, AC-COUPLED Figure 49. Measured Two-Tone IMD3 Performance –30 –25 –20 –15 –10 –5 0 5 10M 100M 1G 10G FREQUENCY (Hz) BRD-3, DUAL-AMP BRD-3, DUAL-AMP, 2.2PF BRD-5, DC-COUPLED, SIG-GEN Figure 50. Measured Relative Frequency Response |
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