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EL5462ISZ-T13 Datasheet(PDF) 6 Page - Intersil Corporation |
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EL5462ISZ-T13 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 9 page 6 FN7492.0 February 14, 2005 Applications Information Product Description The EL5462 is a low power, current-feedback operational amplifier that offers a wide -3dB bandwidth of 500MHz and a low supply current of 1.5mA per amplifier. The EL5462 works with supply voltages ranging from a single 5V to 10V and they are also capable of swinging to within 1V of either supply on the output. Because of its current-feedback topology, the EL5462 does not have the normal gain- bandwidth product associated with voltage-feedback operational amplifiers. Instead, its -3dB bandwidth to remain relatively constant as closed-loop gain is increased. This combination of high bandwidth and low power, together with aggressive pricing makes the EL5462 the ideal choice for many low-power/high-bandwidth applications such as portable, handheld, or battery-powered equipment. Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, a good printed circuit board layout is necessary for optimum performance. Low impedance ground plane construction is essential. Surface mount components are recommended, but if leaded components are used, lead lengths should be as short as possible. The power supply pins must be well bypassed to reduce the risk of oscillation. The combination of a 4.7µF tantalum capacitor in parallel with a 0.01µF capacitor has been shown to work well when placed at each supply pin. For good AC performance, parasitic capacitance should be kept to a minimum, especially at the inverting input. (See the Capacitance at the Inverting Input section) Even when ground plane construction is used, it should be removed from the area near the inverting input to minimize any stray capacitance at that node. Carbon or Metal-Film resistors are acceptable with the Metal-Film resistors giving slightly less peaking and bandwidth because of additional series inductance. Use of sockets, particularly for the SO package, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot. Capacitance at the Inverting Input Any manufacturer’s high-speed voltage or current-feedback amplifier can be affected by stray capacitance at the inverting input. For inverting gains, this parasitic capacitance has little effect because the inverting input is a virtual ground, but for non-inverting gains, this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifier. This pole, if low enough in frequency, has the same destabilizing effect as a zero in the forward open-loop response. The use of large- value feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing the possibility of oscillation.) The EL5462 has been optimized with a 600 Ω feedback resistor. With the high bandwidth of these amplifiers, these resistor values might cause stability problems when combined with parasitic capacitance, thus ground plane is not recommended around the inverting input pin of the amplifier. Pin Descriptions EL5462 PIN NAME FUNCTION EQUIVALENT CIRCUIT 2, 6, 9, 13 IN- Inverting input Circuit 1 3, 5, 10, 12 IN+ Non-inverting input (See circuit 1) 11 VS- Negative supply 1, 7, 8, 14 OUT Output Circuit 2 4 VS+ Positive supply IN- IN+ VS+ VS- VS+ VS- OUT EL5462 |
Similar Part No. - EL5462ISZ-T13 |
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Similar Description - EL5462ISZ-T13 |
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