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ADC16DX370RMET Datasheet(PDF) 47 Page - Texas Instruments |
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ADC16DX370RMET Datasheet(HTML) 47 Page - Texas Instruments |
47 / 77 page -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1000 Frequency [MHz] No series resistance 10 ohm series resistance C001 ADC16DX370 www.ti.com SNVSA18C – APRIL 2014 – REVISED AUGUST 2014 Figure 39. Measured Differential Impedance of Analog Input Network on a Smith Chart (100 Ω) 9.1.1.3 Input Bandwidth The input bandwidth of the ADC16DX370 device is defined here as the frequency at which the fundamental amplitude of the sampled data deviates by 3 dB, compared to the amplitude at low frequencies, for a low- impedance input sinusoidal signal with constant voltage amplitude at the VIN+ and VIN– input pins. The voltage frequency response is shown in Figure 40. The peaking in the frequency response is caused by the resonance between the package bond wires and input capacitance as well as a parasitic 0.5-nH series trace inductance leading to the device pins. This peaking is typically made insignificant by the stop-band of an anti-aliasing filter that precedes the ADC input. For broadband applications, 10- Ω resistors may be put in series with the VIN+ and VIN– input pins. This extra resistance flattens out the frequency response at the cost of adding some attenuation in the signal path. The additional series resistance also accordingly modifies the measured SDD11 looking into the analog input. Figure 40. Measured Input Voltage Frequency Response Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 47 Product Folder Links: ADC16DX370 |
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