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HFA1150 Fiches technique(PDF) 5 Page - Intersil Corporation |
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HFA1150 Fiches technique(HTML) 5 Page - Intersil Corporation |
5 / 13 page 5 PC Board Layout The frequency response of this amplifier depends greatly on the amount of care taken in designing the PC board. The use of low inductance components such as chip resistors and chip capacitors is strongly recommended, while a solid ground plane is a must! Attention should be given to decoupling the power supplies. A large value (10 µF) tantalum in parallel with a small value chip (0.1 µF) capacitor works well in most cases. Terminated microstrip signal lines are recommended at the input and output of the device. Output capacitance, such as that resulting from an improperly terminated transmission line, will degrade the frequency response of the amplifier and may cause oscillations. In most cases, the oscillation can be avoided by placing a resistor in series with the output. Care must also be taken to minimize the capacitance to ground seen by the amplifier’s inverting input. The larger this capacitance, the worse the gain peaking, resulting in pulse overshoot and eventual instability. To reduce this capacitance, remove the ground plane under traces connected to -IN and keep these traces as short as possible. Examples of good high frequency layouts are the evaluation boards shown below. Evaluation Boards The performance of the HFA1150IB (SOIC) may be evaluated using the HFA11XX Evaluation Board and a SOIC to DIP adaptor like the Aries Electronics Part Number 08-350000-10. The SOT-23 version can be evaluated using the OPAMPSOT23EVAL board. To order evaluation boards (part number HFA11XXEVAL or OPAMPSOT23EVAL), please contact your local sales office. The schematic and layout of the HFA11XXEVAL and OPAMPSOT23EVAL boards are shown below. HFA11XXEVAL TOP LAYOUT HFA11XXEVAL BOTTOM LAYOUT 0 100 200 300 400 0 10 20 30 40 50 LOAD CAPACITANCE (pF) 150 250 350 50 FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs LOAD CAPACITANCE AV = +2 SOT-23 SOIC FIGURE 2. HFA11XXEVAL SCHEMATIC 1 2 3 4 8 7 6 5 +5V 10 µF 0.1 µF NC 50 Ω GND GND 511 Ω 511 Ω -5V 50 Ω IN OUT NC VH +IN VL V+ GND 1 V- HFA1150 |
Numéro de pièce similaire - HFA1150 |
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Description similaire - HFA1150 |
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