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HA5002 Datasheet(PDF) 4 Page - Intersil Corporation |
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HA5002 Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 13 page 4 Schematic Diagram Application Information Layout Considerations The wide bandwidth of the HA-5002 necessitates that high frequency circuit layout procedures be followed. Failure to follow these guidelines can result in marginal performance. Probably the most crucial of the RF/video layout rules is the use of a ground plane. A ground plane provides isolation and minimizes distributed circuit capacitance and inductance which will degrade high frequency performance. Other considerations are proper power supply bypassing and keeping the input and output connections as short as possible which minimizes distributed capacitance and reduces board space. Power Supply Decoupling For optimal device performance, it is recommended that the positive and negative power supplies be bypassed with capacitors to ground. Ceramic capacitors ranging in value from 0.01 to 0.1 µF will minimize high frequency variations in supply voltage, while low frequency bypassing requires larger valued capacitors since the impedance of the capacitor is dependent on frequency. It is also recommended that the bypass capacitors be connected close to the HA-5002 (preferably directly to the supply pins). Operation at Reduced Supply Levels The HA-5002 can operate at supply voltage levels as low as ±5V and lower. Output swing is directly affected as well as slight reductions in slew rate and bandwidth. Short Circuit Protection The output current can be limited by using the following circuit: Capacitive Loading The HA-5002 will drive large capacitive loads without oscillation but peak current limits should not be exceeded. Following the formula I = Cdv/dt implies that the slew rate or the capacitive load must be controlled to keep peak current below the maximum or use the current limiting approach as shown. The HA-5002 can become unstable with small capacitive loads (50pF) if certain precautions are not taken. Stability is enhanced by any one of the following: a source resistance in series with the input of 50 Ω to 1kΩ; increasing capacitive load to 150pF or greater; decreasing CLOAD to 20pF or less; adding an output resistor of 10 Ω to 50Ω; or adding feedback capacitance of 50pF or greater. Adding source resistance generally yields the best results. R9 R10 Q25 Q9 Q10 R5 Q11 Q15 Q23 R7 Q21 Q22 Q24 Q27 Q26 R8 Q20 Q18 Q3 R4 R1 Q7 Q4 Q8 R6 R3 R12 Q16 Q14 Q13 R2 RN3 R11 Q5 Q6 Q12 RN1 Q19 RN2 V1- V2- OUT V2+ V1+ Q1 Q2 IN Q17 OUT IN V+ RLIM RLIM V1- V2- V2+ V1+ V- IOUTMAX = 200mA (CONTINUOUS) R LIM V+ I OUTMAX -------------------------- V- I OUTMAX -------------------------- == HA-5002 |
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Similar Description - HA5002 |
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