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EL8300 Datasheet(PDF) 11 Page - Intersil Corporation |
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EL8300 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 Typical Applications VIDEO SYNC PULSE REMOVER Many CMOS analog to digital converters have a parasitic latch up problem when subjected to negative input voltage levels. Since the sync tip contains no useful video information and it is a negative going pulse, we can chop it off. Figure 28 shows a gain of 2 connections for EL8300. Figure 29 shows the complete input video signal applied at the input, as well as the output signal with the negative going sync pulse removed. MULTIPLEXER Besides the normal power down usage, the ENABLE pin of the EL8300 can be used for multiplexing applications. Figure 30 shows two channels with the outputs tied together, driving a back terminated 75 Ω video load. A 2VP-P 2MHz sine wave is applied to Amp A and a 1VP-P 2MHz sine wave is applied to Amp B. Figure 31 shows the ENABLE signal and the resulting output waveform at VOUT. Observe the break-before-make operation of the multiplexing. Amp A is on and VIN1 is passed through to the output when the ENABLE signal is low and turns off in about 25ns when the ENABLE signal is high. About 200ns later, Amp B turns on and VIN2 is passed through to the output. The break-before- make operation ensures that more than one amplifier isn’t trying to drive the bus at the same time. SINGLE SUPPLY VIDEO LINE DRIVER The EL8300 is wideband rail-to-rail output op amplifiers with large output current, excellent dG, dP, and low distortion that allow them to drive video signals in low supply applications. Figure 32 is the single supply non-inverting video line driver configuration and Figure 33 is the inverting video ling driver configuration. The signal is AC coupled by C1. R1 and R2 are used to level shift the input and output to provide the largest output swing. RF and RG set the AC gain. C2 isolates the virtual ground potential. RT and R3 are the termination resistors for the line. C1, C2 and C3 are selected big enough to minimize the droop of the luminance signal. FIGURE 28. SYNC PULSE REMOVER 5V 1K VOUT VIN 75 Ω + - 75 Ω 1K 75 Ω VS+ VS- FIGURE 29. VIDEO SIGNAL 1V 0.5V 0V 1V 0.5V 0V M = 10µs/DIV VOUT VIN FIGURE 30. TWO TO ONE MULTIPLEXER +2.5V 1K 2MHz 75 Ω + - 1K 75 Ω -2.5V VOUT 75 Ω 1VP-P B +2.5V 1K 2MHz + - 1K 75 Ω -2.5V 2VP-P A ENABLE FIGURE 31. ENABLE SIGNAL 0V -0.5V -1.5V -2.5V 1V 0V M = 50ns/DIV A ENABLE B -1V EL8300 |
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