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EL2075CN Datasheet(PDF) 7 Page - Intersil Corporation |
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EL2075CN Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 8 page 7 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com Output Drive Capability The EL2075 has been optimized to drive 50 Ω and 75Ω loads. It can easily drive 6VPP into a 50Ω load. This high output drive capability makes the EL2075 an ideal choice for RF and IF applications. Furthermore, the current drive of the EL2075 remains a minimum of 50mA at low temperatures. The EL2075 is current-limited at the output, allowing it to withstand momentary shorts to ground. However, power dissipation with the output shorted can be in excess of the power-dissipation capabilities of the package. Capacitive Loads Although the EL2075 has been optimized to drive resistive loads as low as 50 Ω, capacitive loads will decrease the amplifier's phase margin which may result in peaking, overshoot, and possible oscillation. For optimum AC performance, capacitive loads should be reduced as much as possible or isolated via a series output resistor. Coax lines can be driven, as long as they are terminated with their characteristic impedance. When properly terminated, the capacitance of coaxial cable will not add to the capacitive load seen by the amplifier. Capacitive loads greater than 10pF should be buffered with a series resistor (RS) to isolate the load capacitance from the amplifier output. A curve of recommended RS vs CLOAD has been included for reference. Values of RS were chosen to maximize resulting bandwidth without additional peaking. Printed-Circuit Layout 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 1µF–10µF tantalum capacitor is recommended in parallel with a 0.01µF ceramic capacitor. All pin lengths should be as short as possible, and all bypass capacitors should be as close to the device pins as possible. Parasitic capacitances should be kept to an absolute minimum at both inputs and at the output. Resistor values should be kept under 1000 Ω to 2000Ω 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 parasitic inductance. Similarly, capacitors should be low- inductance for best performance. If possible, solder the EL2075 directly to the PC board without a socket. Even high quality sockets add parasitic capacitance and inductance which can potentially degrade performance. Because of the degradation of AC performance due to parasitics, the use of surface-mount components (resistors, capacitors, etc.) is also recommended. EL2075 |
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