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EL8102IS-T7 Datasheet(PDF) 9 Page - Intersil Corporation |
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EL8102IS-T7 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 12 page 9 Description of Operation and Application Information Product Description The EL8102, EL8103 are wide bandwidth, single supply, low power and rail-to-rail output voltage feedback operational amplifiers. Both amplifiers are internally compensated for closed loop gain of +1 of greater. Connected in voltage follower mode and driving a 1k Ω load, the EL8102, EL8103 have a -3dB bandwidth of 500MHz. Driving a 150 Ω load, the bandwidth is about 350MHz while maintaining a 600V/us slew rate. The EL8102 is available with a power down pin to reduce power to 30µA typically while the amplifier is disabled. Input, Output and Supply Voltage Range The EL8102, EL8103 have been designed to operate with a single supply voltage from 3V to 5.0V. Split supplies can also be used as long as their total voltage is within 3V to 5.0V. The amplifiers have an input common mode voltage range from 0.15V below the negative supply (VS- pin) to within 1.5V of the positive supply (VS+ pin). If the input signal is outside the above specified range, it will cause the output signal to be distorted. The output of the EL8102, EL8103 can swing rail to rail. As the load resistance becomes lower, the ability to drive close to each rail is reduced. For the load resistor 1k Ω, the output swing is about 4.9V at a 5V supply. For the load resistor 150 Ω, the output swing is about 4.6V. Choice of Feedback Resistor and Gain Bandwidth Product For applications that require a gain of +1, no feedback resistor is required. Just short the output pin to the inverting input pin. For gains greater than +1, the feedback resistor forms a pole with the parasitic capacitance at the inverting input. As this pole becomes smaller, the amplifier’s phase margin is reduced. This causes ringing in the time domain and peaking in the frequency domain. Therefore, RF has some maximum value that should not be exceeded for optimum performance. If a large value of RF must be used, a small capacitor in the few pF range in parallel with RF can help to reduce the ringing and peaking at the expense of reducing the bandwidth. As far as the output stage of the amplifier is concerned, the output stage is also a gain stage with the load. RF and RG appear in parallel with RL for gains other than +1. As this combination gets smaller, the bandwidth falls off. Consequently, RF also has a minimum value that should not be exceeded for optimum performance. For gain of +1, RF=0 is optimum. For the gains other than +1, optimum response is obtained with RF between 300Ω to 1kΩ. The EL8102, EL8103 have a gain bandwidth product of 200MHz. For gains ≥5, its bandwidth can be predicted by the following equation: Video Performance For good video performance, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This is especially difficult when driving a standard video load of 150 Ω, because the change in output current with DC level. Special circuitry has been incorporated in the EL8102, EL8103 to reduce the variation of the output impedance with the current output. This results in dG and dP specifications of 0.01% and 0.01 °, while driving 150Ω at a gain of 2. Driving high impedance loads would give a similar or better dG and dP performance. Driving Capacitive Loads and Cables The EL8102, EL8103 can drive 10pF loads in parallel with 1k Ω with less than 5dB of peaking at gain of +1. If less peaking is desired in applications, a small series resistor (usually between 5 Ω to 50Ω) can be placed in series with the FIGURE 29. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Typical Performance Curves (Continued) 1 0.9 0.8 0.6 0.4 0.1 0 0 255075 100 150 AMBIENT TEMPERATURE (°C) 125 85 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.2 0.7 0.3 0.5 625mW SO8 θJA=160°C/W SOT23-5/6 θJA=256°C/W 391mW Gain BW × 200MHz = EL8102, EL8103 |
Similar Part No. - EL8102IS-T7 |
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Similar Description - EL8102IS-T7 |
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