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THS3121CD Datasheet(PDF) 16 Page - Texas Instruments |
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THS3121CD Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 28 page ![]() www.ti.com WIDEBAND, INVERTING OPERATION _ + THS3120 49.9 Ω 50 Ω Source VI +VS RF 649 Ω RG 649 Ω +VS 2 +VS 2 _ + THS3120 340 Ω 50 Ω Source VI VS RF 681 Ω +VS 2 +VS 2 59 Ω RG RT RT 49.9 Ω 49.9 Ω 50 Ω LOAD 50 Ω LOAD _ + THS3120 RG 340 Ω 0.1 µF 6.8 µF -VS -15 V 50 Ω Source + VI 0.1 µF 6.8 µF + +VS 15 V RF 681 Ω RM 59 Ω 49.9 Ω 50 Ω LOAD Video Distribution SINGLE SUPPLY OPERATION + - 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω n Lines VO(1) VO(n) 75- Ω Transmission Line VI 649 Ω 649 Ω -15 V 15 V THS3120, THS3121 SLOS420A – SEPTEMBER 2003 – REVISED NOVEMBER 2003 Figure 46 shows the THS3121 in a typical inverting gain configuration where the input and output im- pedances and signal gain from Figure 45 are retained in an inverting circuit configuration. Figure 47. DC-Coupled, Single-Supply Operation Figure 46. Wideband, Inverting Gain Configuration The wide bandwidth, high slew rate, and high output drive current of the THS3120 and THS3121 matches The THS3120 and THS3121 have the capability to the demands for video distribution for delivering video operate from a single supply voltage ranging from signals down multiple cables. To ensure high signal 10 V to 30 V. When operating from a single power quality with minimal degradation of performance, a supply, biasing the input and output at mid-supply 0.1-dB gain flatness should be at least 7x the allows for the maximum output voltage swing. The passband frequency to minimize group delay vari- circuits shown in Figure 47 shows inverting and ations from the amplifier. A high slew rate minimizes noninverting amplifiers configured for single supply distortion of the video signal, and supports operations. component video and RGB video signals that require fast transition times and fast settling times for high signal quality. Figure 48. Video Distribution Amplifier Application 16 |
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