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EL5308IU Datasheet(PDF) 8 Page - Intersil Corporation |
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EL5308IU Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 Applications Information Product Description The EL5108 and EL5308 are fixed gain amplifiers that offer a wide -3dB bandwidth of 450MHz and a low supply current of 3.5mA per amplifier. They work with supply voltages ranging from a single 5V to 10V and they are also capable of swinging to within 1.2V of either supply on the output. These combinations of high bandwidth, low power, and high slew rate make the EL5108 and EL5308 the ideal choice for many low-power/high-bandwidth applications such as portable, handheld, or battery-powered equipment. For varying bandwidth and higher gains, consider the EL5166 with 1GHz on a 9mA supply current or the EL5164 with 600MHz on a 3.5mA supply current. Versions include single, dual, and triple amp packages with 6-pin SOT-23, 16-pin QSOP, and 8-pin or 16-pin SO outlines. Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Low impedance ground plane construction is essential. Surface mount components are recommended, but if leaded components are used, lead lengths should be as short as possible. The power supply pins must be well bypassed to reduce the risk of oscillation. The combination of a 4.7µF tantalum capacitor in parallel with a 0.01µF capacitor has been shown to work well when placed at each supply pin. Disable/Power-Down The EL5108 and EL5308 amplifiers can be disabled and placing their outputs in a high impedance state. When disabled, the amplifier supply current is reduced to <25µA. The EL5108 and EL5308 are disabled when the CE pin is pulled up to within 1V of the positive supply. Similarly, the amplifier is enabled by floating or pulling its CE pin to at least 3V below the positive supply. For ±5V supply, this means that the amplifier will be enabled when CE is 2V or less, and disabled when CE is above 4V. Although the logic levels are not standard TTL, this choice of logic voltages allow the EL5108 and EL5308 to be enabled by tying CE to ground, even in 5V single supply applications. The CE pins can be driven from CMOS outputs. Gain Setting The EL5108 and EL5308 are built with internal feedback and gain resistors. The internal feedback resistors have equal value; as a result, the amplifier can be configured into gain of +1, -1, and +2 without any external resistors. Figure 21 shows the amplifier in gain of +2 configuration. The gain error is ±2% maximum. Figure 22 shows the amplifier in gain of -1 configuration. For gain of +1, IN+ and IN- should be connected together as shown in Figure 23. This configuration avoids the effects of any parasitic capacitance on the IN- pin. Since the internal feedback and gain resistors change with temperature and process, external resistor should not be used to adjust the gain settings. FIGURE 19. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 20. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Typical Performance Curves (Continued) 1 0.9 0.8 0.6 0.4 0.1 0 0 25 50 75 100 150 AMBIENT TEMPERATURE (°C) 125 85 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.2 0.7 0.3 0.5 909mW 625mW 633mW 391mW SO16 (0.150”) θJA=110°C/W SO8 θJA=160°C/W QSOP16 θJA=158°C/W SOT23-6 θJA=256°C/W AMBIENT TEMPERATURE (°C) 0 0.4 1.4 1.2 1 0.8 0.6 0.2 0 25 50 75 100 150 125 85 JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.1 1.250W QSOP16 θJA=112°C/W 909mW 893mW 435mW SO8 θJA=110°C/W SOT23-6 θJA=230°C/W SO16 (0.150”) θJA=80°C/W FIGURE 21. AV = +2 - + 325 Ω 325 Ω IN- IN+ EL5108, EL5308 |
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