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EL2311CN Datasheet(PDF) 6 Page - Intersil Corporation |
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EL2311CN Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 11 page 6 Typical Performance Curves Application Information Product Description The EL2210, EL2310, and EL2410 are dual, triple, and quad operational amplifiers stable at a gain of 1. The EL2211, EL2311, and EL2411 are dual, triple, and quad operational amplifiers stable at a gain of 2. All six are built on Elantec's proprietary complimentary process and share the same voltage mode feedback topology. This topology allows them to be used in a variety of applications where current mode feedback amplifiers are not appropriate because of restrictions placed on the feedback elements. These products are especially designed for applications where high bandwidth and good video performance characteristics are desired but the higher cost of more flexible and sophisticated products are prohibitive. Power Supplies These amplifiers are designed to work at a supply voltage difference of 10V to 12V. These amplifiers will work on any combination of ± supplies. All electrical characteristics are measured with ±5V supplies. Below 9V total supply voltage the amplifiers’ performance will degrade dramatically. The quiescent current is a direct function of total supply voltage. With a total supply voltage of 12V the quiescent supply current will increase from a typical 6.8mA per amplifier to 10mA per amplifier. Output Swing vs Load Please refer to the simplified block diagram. These amplifiers provide an NPN pull-up transistor output and a passive 1250 Ω pull-down resistor to the most negative supply. In an application where the load is connected to VS- the output voltage can swing to within 200mV of VS-. In split supply applications where the DC load is connected to ground the negative swing is limited by the voltage divider formed by the load, the internal 1250 Ω resistor and any external pull-down resistor. If RL were 150Ω then it and the 1250Ω internal resistor limit the maximum negative swing to Or--0.53V The negative swing can be increased by adding an external resistor of appropriate value from the output to the negative supply. The simplified block diagram shows an 820 Ω external pull-down resistor. This resistor is in parallel with the internal 1250 Ω resistor. This will increase the negative swing to Or -1.16V Power Dissipation and Loading Without any load and a 10V supply difference the power dissipation is 70mW per amplifier. At 12V supply difference this increases to 105mW per amplifier. At 12V this translates to a junction temperature rise above ambient of 33°C for the dual and 40°C for the quad amplifier. When the amplifiers provide load current the power dissipation can rapidly rise. In ±5V operation each output can drive a grounded 150 Ω load to more than 2V. This operating condition will not exceed the maximum junction temperature limit as long as the ambient temperature is below 85°C, the device is soldered in place, and the extra pull-down resistor is 820Ω or more. If the load is connected to the most negative voltage (ground in single supply operation) you can easily exceed the absolute maximum die temperature. For example the maximum die temperature should be 150°C. At a maximum Package Power Dissipation vs Ambient Temp. JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 1.2 1 0.8 0.6 0.4 0.2 0 0 255075 100 125 150 85 Package Power Dissipation vs Ambient Temp. JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 1.8 1.6 1.4 1.2 0.8 0.4 0 0 255075 100 125 150 85 1 0.6 0.2 Ambient Temperature (°C) Ambient Temperature (°C) 1.042W 781W θ JA=120°C/W SO8 SO14 θ JA=160°C/W 1.54W 1.25W θ JA=81°C/W PDIP8 PDIP14 θ JA=100°C/W V EE 150 1250 150 + ----------------------------- = V EE 150 1250 820 × 1250 820 + ----------------------------- ÷ 150 + = EL2210/11, EL2310/11, EL2410/11 |
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