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EL5360IS Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5360IS Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 17 page 11 FN7387.9 May 7, 2007 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 EL5160, EL5161, EL5260, EL5261, and EL5360 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. 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 EL5160, EL5161, EL5260, EL5261, and EL5360 have no internal current-limiting circuitry. If the output is shorted, it is possible to exceed the Absolute Maximum Rating for output current or power dissipation, potentially resulting in the destruction of the device. Power Dissipation With the high output drive capability of the EL5160, EL5161, EL5260, EL5261, and EL5360, it is possible to exceed the +125°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 EL5160, EL5161, EL5260, EL5261, and EL5360 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 0.75mA •VOUTMAX = Maximum output voltage (required) •RL = Load resistance Typical Application Circuits FIGURE 22. FAST-SETTLING PRECISION AMPLIFIER T JMAX T MAX θ JA nPD MAX × × () + = PD MAX 2 ( V S I SMAX ) V S ( V OUTMAX ) V OUTMAX R L ---------------------------- × – + × × = IN+ IN- VS+ VS- OUT IN+ IN- VS+ VS- OUT 0.1µF +5V 0.1µF -5V 500 Ω 5 Ω 5 Ω 500 Ω 500 Ω VOUT VIN 0.1µF 0.1µF +5V -5V FIGURE 21. INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER IN+ IN- VS+ VS- OUT IN+ IN- VS+ VS- OUT 0.1µF +5V 0.1µF -5V 0.1µF 0.1µF 500 Ω 500 Ω 500 Ω 500 Ω VOUT VIN +5V -5V EL5160, EL5161, EL5260, EL5261, EL5360 |
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