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EL5132ISZ-T13 Datasheet(PDF) 10 Page - Intersil Corporation |
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EL5132ISZ-T13 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 FN7382.8 May 4, 2007 Applications Information Product Description The EL5132, EL5133 is a voltage feedback operational amplifier designed for communication and imaging applications requiring very low voltage and current noise. It also features low distortion while drawing moderately low supply current and is built on Intersil's proprietary high-speed complementary bipolar process. The EL5132, EL5133 uses a classical voltage-feedback topology which allows them to be used in a variety of applications where current-feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. Gain-Bandwidth Product and the -3dB Bandwidth The EL5132, EL5133 has a gain-bandwidth product of 3000MHz while using only 11mA of supply current. For gains greater than 10, their closed-loop -3dB bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit. For gains of 10, higher-order poles in the amplifiers' transfer function contribute to even higher closed loop bandwidths. For example, the EL5132, EL5133 have a -3dB bandwidth of 670MHz at a gain of 10, dropping to 150MHz at a gain of 30. It is important to note that the EL5132, EL5133 is designed so that this “extra” bandwidth in low-gain application does not come at the expense of stability. As seen in the typical performance curves, the EL5132, EL5133 in a gain of only 10 exhibited 0.5dB of peaking with a 500 Ω load. Output Drive Capability The EL5132 and EL5133 are is designed to drive a low impedance load. It can easily drive 6VP-P signal into a 500Ω load. This high output drive capability makes the EL5132, EL5133 an ideal choice for RF, IF, and video applications. Furthermore, the EL5132, EL5133 is current-limited at the output, allowing it to withstand momentary short to ground. However, the power dissipation with output-shorted cannot exceed the power dissipation capability of the package. Driving Cables and Capacitive Loads Although the EL5132, EL5133 is designed to drive low impedance load, capacitive loads will decreases the amplifier's phase margin. As shown in the performance curves, capacitive load can result in peaking, overshoot and possible oscillation. For optimum AC performance, capacitive loads should be reduced as much as possible or isolated with a series resistor between 5 Ω to 20Ω. When driving coaxial cables, double termination is always recommended for reflection-free performance. When properly terminated, the capacitance of the coaxial cable will not add to the capacitive load seen by the amplifier. Disable/Power-Down The EL5132 amplifier can be disabled placing its output in a high impedance state. When disable, the amplifier current is reduced to 12µA. The EL5132 is disabled when it CE pin is pulled up to within 1V of the power supply. Similarly, the amplifier is enabled by floating or pulling its CE pin to at least 3V below the positive supply. For ±5V supply, this means that an EL5132 amplifier will be enabled when CE is 2V or FIGURE 35. DIFFERENTIAL GAIN (%) FIGURE 36. DIFFERENTIAL PHASE (°) Typical Performance Curves (Continued) 0.2 0 010 0.1 -0.05 0.0 -0.15 -0.20 20 30 40 50 60 70 80 90 100 0.20 0 010 0.15 -0.05 0.05 -0.15 -0.20 20 30 40 50 60 70 80 90 100 EL5132, EL5133 |
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