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EL2311CS Datasheet(PDF) 7 Page - Intersil Corporation |
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EL2311CS Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 expected ambient temperature of 85°C, the total allowable power dissipation for the SO8 package would be: At 12V total supply voltage each amplifier draws a maximum of 10mA and dissipates 12V * 10mA = 120mW or 240mW for the dual amplifier. Which leaves 121mW of increased power due to the load. If the load were 150 Ω connected to the most negative voltage and the maximum voltage out were VS- +1V the load current would be 6.67mA. Then an extra 146mW ((12V - 1V) * 6.67mA * 2) would be dissipated in the EL2210 or EL2211. The total dual amplifier power dissipation would be 146mW + 240mW = 386mW, more than the maximum 361mW allowed. If the total supply difference were reduced to 10V, the same calculations would yield 200mW quiescent power dissipation and 120mW due to loading. This results in a die temperature of 143°C (85°C + 58°C). In the above example, if the supplies were split ±6V and the 150 Ω loads were connected to ground, the load induced power dissipation would drop to 66.7mW (6.67mA * (6 - 1) * 2) and the die temperature would be below the rated maximum. Video Performance Following industry standard practices (see EL2044 applications section) these six devices exhibit good differential gain (dG) and good differential phase (dP) with ±5V supplies and an external 820 Ω resistor to the negative supply, in a gain of 2 configuration. Driving 75 Ω back terminated cables to standard video levels (1.428V at the amplifier) the EL2210, EL2310, and EL2410 have dG of 0.1% and dP of 0.2°. The EL2211, EL2311, and EL2411 have dG of 0.04% and dP of 0.15°. Due to the negative swing limitations described above, inverted video at a gain of 2 is just not practical. If swings below ground are required then changing the extra 820 Ω resistor to 500 Ω will allow reasonable dG and dP to approximately -0.75mV. The EL2211, EL2311, and EL2411 will achieve approximately 0.1%/0.4° between 0V and -0.75V. Beyond -0.75V dG and dP get worse by orders of magnitude. Differential gain and differential phase are fairly constant for all loads above 150 Ω. Differential phase performance will improve by a factor of 3 if the supply voltage is increased to ±6V. Output Drive Capability None of these devices have short circuit protection. Each output is capable of more than 100mA into a shorted output. Care must be used in the design to limit the output current with a series resistor. Printed-Circuit Layout The EL2210/EL2211/EL2310/EL2311/ EL2410/EL2411 are well behaved, and easy to apply in most applications. However, a few simple techniques will help assure rapid, high quality results. As with any high-frequency device, good PCB layout is necessary for optimum performance. Ground- plane construction is highly recommended, as is good power supply bypassing. A 0.1µF ceramic capacitor is recommended for bypassing both supplies. Lead lengths should be as short as possible, and bypass capacitors should be as close to the device pins as possible. For good AC performance, parasitic capacitances should be kept to a minimum at both inputs and at the output. Resistor values should be kept under 5k Ω because of the RC time constants associated with the parasitic capacitance. Metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low-inductance for best performance. P D 150 85 – 160 °C/W ------------------------- 361mW = = EL2210/11, EL2310/11, EL2410/11 |
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