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EL2480CS-T13 Datasheet(PDF) 10 Page - Intersil Corporation |
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EL2480CS-T13 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 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. Until the EL2480, good Differential Gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output impedance). These currents were typically comparable to the entire 3mA supply current of EL2480 amplifier! Special circuitry has been incorporated in the EL2480 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.05% and 0.05° while driving 150 Ω at a gain of +2. Video performance has also been measured with a 500 Ω load at a gain of +1. Under these conditions, the EL2480 has dG and dP specifications of 0.01% and 0.01° respectively while driving 500 Ω at AV = +1. Output Drive Capability This amplifier of the EL2480 is capable of providing a minimum of ±50mA. These output drive levels are unprecedented in amplifiers running at these supply currents. The ±50mA minimum output drive of the EL2480 amplifier allows swings of ±2.5V into 50 Ω loads. 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 EL2480 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 50 Ω) can be placed in series with the output to eliminate most peaking. The gain resistor (RG) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output. In many cases it is also possible to simply increase the value of the feedback resistor (RF) to reduce the peaking. Current Limiting The EL2480 has no internal current-limiting circuitry. If any output is shorted, it is possible to exceed the Absolute Maximum Ratings for output current or power dissipation, potentially resulting in the destruction of the device. Power Dissipation With the high output drive capability of the EL2480, it is possible to exceed the 150°C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking, when RL falls below about 25Ω, it is important to calculate the maximum junction temperature (TJMAX) for the application to determine if power-supply voltages, load conditions, or package type need to be modified for the EL2480 to remain in the safe operating area. These parameters are calculated as follows: where: TMAX = Maximum ambient temperature θ JA = Thermal resistance of the package n = Number of amplifiers in the package PDMAX = Maximum power dissipation of each amplifier in the package PDMAX for each amplifier can be calculated as follows: where: VS = Supply voltage ISMAX = Maximum supply current of 1 amplifier VOUTMAX = Maximum output voltage of the application RL = Load resistance T JMAX T MAX Θ JA nPD MAX × × () + = PD MAX 2 ( V S I SMAX ) V S ( - V OUTMAX ) V OUTMAX R L ---------------------------- × + × × = EL2480 |
Similar Part No. - EL2480CS-T13 |
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Similar Description - EL2480CS-T13 |
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