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ISL55001IBZ-T7 Fiches technique(PDF) 9 Page - Intersil Corporation |
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ISL55001IBZ-T7 Fiches technique(HTML) 9 Page - Intersil Corporation |
9 / 12 page 9 FN6200.3 November 3, 2009 For sinking use Equation 3: Where: •VS+ = Positive supply voltage •VS- = Negative supply voltage •ISMAX = Maximum quiescent supply current •VOUT = Average output voltage of the application •RLOAD = Load resistance tied to ground •ILOAD = Load current • n = number of amplifiers (n = 1 for ISL55001) By setting the two PDMAX equations (Equations 1, 2 or 3) equal to each other, we can solve the output current and RLOAD to avoid the device overheat. 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 ISL55001. A derivation of the transfer function is provided for convenience (see Figure 25). Sallen-Key High Pass Filter Again this useful filter benefits from the characteristics of the ISL55001. The transfer function is very similar to the low pass so only the results are presented (see Figure 26). (EQ. 3) PD MAX (V S+ V S- ) – I SMAX V OUTi V – S - () i1 = n ∑ V OUTi R LOADi --------------------- × + × = K Q RC wo K K Holp C R C R C R C R C R C R K Q C R C R wo K Holp − = = − = + + − = = = 4 2 2 4 ) 1 ( 1 1 1 1 2 2 1 2 2 1 2 2 1 1 2 2 1 1 FIGURE 25. SALLEN-KEY LOW PASS FILTER + - V+ V- V2 5V C5 1nF VOUT R7 1kΩ V3 5V R1 1kΩ R2 1kΩ C2 1nF V1 C1 1nF C5 1nF RA 1kΩ RB 1kΩ ISL55001 |
Numéro de pièce similaire - ISL55001IBZ-T7 |
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Description similaire - ISL55001IBZ-T7 |
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