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EL5306IU-T7 Datasheet(PDF) 8 Page - Intersil Corporation |
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EL5306IU-T7 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 11 page 8 Supply Voltage Range and Single-Supply Operation The EL5106 and EL5306 have been designed to operate with supply voltages having a span of greater than or equal to 5V and less than 11V. In practical terms, this means that the EL5106 and EL5306 will operate on dual supplies ranging from ±2.5V to ±5V. With single-supply, the EL5106 and EL5306 will operate from 5V to 10V. As supply voltages continue to decrease, it becomes necessary to provide input and output voltage ranges that can get as close as possible to the supply voltages. The EL5106 and EL5306 have an input range which extends to within 2V of either supply. So, for example, on ±5V supplies, the EL5106 and EL5306 have an input range which spans ±3V. The output range is also quite large, extending to within 1V of the supply rail. On a ±5V supply, the output is therefore capable of swinging from -4V to +4V. Single-supply output range is larger because of the increased negative swing due to the external pull-down resistor to ground. Figure 16 shows an AC-coupled, gain of +2, +5V single supply circuit configuration. Video Performance For good video performance, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This is especially difficult when driving a standard video load of 150 Ω, because of the change in output current with DC level. Previously, good differential gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output impedance). Special circuitries have been incorporated in the EL5106 and EL5306 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.02% and 0.04°, while driving 150 Ω at a gain of 2. Output Drive Capability In spite of its low 1.5mA of supply current per amplifier, the EL5106 and EL5306 are capable of providing a maximum of ±125mA of output current. Driving Cables and Capacitive Loads When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back-termination series resistor will decouple the EL5106 and EL5306 from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back-termination resistor. In these applications, a small series resistor (usually between 5 Ω and 50Ω) can be placed in series with the output to eliminate most peaking. FIGURE 15. AV = -1 - + 325 Ω 325 Ω IN- IN+ FIGURE 16. AV = +1 - + 325 Ω 325 Ω IN- IN+ FIGURE 17. - + 325 Ω 325 Ω VIN +5 0.1µF 1K 1K 0.1µF +5 VOUT EL5106, EL5306 |
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