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ISL55004IB-T13 Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL55004IB-T13 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 12 page 9 FN6219.2 July 27, 2006 For sourcing: For sinking: Where: •VS = Supply voltage •ISMAX = Maximum quiescent supply current •VOUT = Maximum output voltage of the application •RLOAD = Load resistance tied to ground •ILOAD = Load current • N = number of amplifiers (max = 4) By setting the two PDMAX equations equal to each other, we can solve the output current and RLOAD to avoid the device overheat. Caution: For supply voltages greater then 20V, the maximum power dissipation at 85°C ambient temperature could be exceeded. For higher supply voltages the maximum ambient temperature must be de-rated according to the Package Power Dissipation curve Figure 27. The maximum power dissipation is highly dependent upon the thermal conductivity of the PCB. For lower thermal conductivity boards use Figure 26. Power Supply Bypassing Printed Circuit Board Layout As with any high frequency device, a good printed circuit board layout is necessary for optimum performance. Lead lengths should be as short as possible. The power supply pin must be well bypassed to reduce the risk of oscillation. For normal single supply operation, where the VS- pin is connected to the ground plane, a single 4.7µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor from VS+ to GND will suffice. This same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. In this case, the VS- pin becomes the negative supply rail. Printed Circuit Board Layout For good AC performance, parasitic capacitance should be kept to minimum. Use of wire wound resistors should be avoided because of their additional series inductance. Use of sockets should also be avoided if possible. Sockets add parasitic inductance and capacitance that can result in compromised performance. Minimizing parasitic capacitance at the amplifier's inverting input pin is very important. The feedback resistor should be placed very close to the inverting input pin. Strip line design techniques are recommended for the signal traces. Application Circuits Sallen Key Low Pass Filter A common and easy to implement filter taking advantage of the wide bandwidth, low offset and low power demands of the ISL55004. A derivation of the transfer function is provided for convenience (See Figure 28). Sallen Key High Pass Filter Again this useful filter benefits from the characteristics of the ISL55004. The transfer function is very similar to the low pass so only the results are presented (See Figure 29). PD MAX V S I SMAX V S V OUTi – () i1 = n ∑ V OUTi R Li ----------------- × + × = PD MAX V S I SMAX V OUTi V S – () i1 = n ∑ I LOADi × + × = ISL55004 |
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