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EL5455IS-T13 Datasheet(PDF) 9 Page - Intersil Corporation |
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EL5455IS-T13 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 16 page 9 FN7385.4 October 3, 2005 EL5152 Product Description The EL5152, EL5153, EL5252, and EL5455 are wide bandwidth, low power, low offset voltage feedback operational amplifiers capable of operating from a single or dual power supplies. This family of operational amplifiers are internally compensated for closed loop gain of +1 or greater. Connected in voltage follower mode, driving a 500 Ω load members of this amplifier family demonstrate a -3dB bandwidth of about 270MHz. With the loading set to accommodate typical video application, 150 Ω load and gain set to +2, bandwidth reduces to about 180MHz with a 600V/µs slew rate. Power down pins on the EL5152 and EL5252 reduce the already low power demands of this amplifier family to 17µA typical while the amplifier is disabled. Input, Output and Supply Voltage Range The EL5152 and EL5153 families have been designed to operate with supply voltage ranging from 5V to 12V. Supply voltages range from ±2.5V to ±5V for split supply operation. Of course split supply operation can easily be achieved using single supplies by splitting off half of the single supply with a simple voltage divider as illustrated in the application circuit section. Input Common Mode Range These amplifiers have an input common mode voltage ranging from 1.5V above the negative supply (VS- pin) to 1.5V below the positive supply (VS+ pin). If the input signal is driven beyond this range the output signal will exhibit distortion. Maximum Output Swing & Load Resistance The outputs of the EL5152 and EL5153 families maximum output swing ranges from -4V to 4V for VS = ±5V with a load resistance of 500 Ω. Naturally, as the load resistance becomes lower, the output swing lowers accordingly; for instance, if the load resistor is 150 Ω, the output swing ranges from -3.5V to 3.5V. This response is a simple application of Ohms law indicating a lower value resistance results in greater current demands of the amplifier. Additionally, the load resistance affects the frequency response of this family as well as all operational amplifiers, as clearly indicated by the Gain vs Frequency for Various RL curves clearly indicate. In the case of the frequency response reduced bandwidth with decreasing load resistance is a function of load resistance in conjunction with the output zero response of the amplifier. Choosing a Feedback Resistor A feedback resistor is required to achieve unity gain; simply short the output pin to the inverting input pin. Gains greater than +1 require a feedback and gain resistor to set the desired gain. This gets interesting because the feedback resistor forms a pole with the parasitic capacitance at the inverting input. As the feedback resistance increases the position of the pole shifts in the frequency domain, the amplifier's phase margin is reduced and the amplifier becomes less stable. Peaking in the frequency domain and ringing in the time domain are symptomatic of this shift in pole location. So we want to keep the feedback resistor as small as possible. You may want to use a large feedback resistor for some reason; in this case to compensate the shift of the pole and maintain stability a small capacitor in the few Pico farad range in parallel with the feedback resistor is recommended. For the gains greater than unity, it has been determined a feedback resistance ranging from 500 Ω to 750Ω provides optimal response. Gain Bandwidth Product The EL5156 and EL5157 families have a gain bandwidth product of 210MHz for a gain of +5. 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 same frequency response as DC levels are changed at the output; this characteristic is widely referred to as “diffgain-diffphase”. Many amplifiers have a difficult time with this especially while driving standard video loads of 150 Ω, as the output current has a natural tendency to change with DC level. The EL5152 dG and dP for these families is a respectable 0.006% and 0.04%, while driving 150 Ω at a gain of 2. Driving high impedance loads would give a similar or better dG and dP performance as the current output demands placed on the amplifier lessen with increased load. Driving Capacitive Loads The EL5152 and EL5153 families can easily drive capacitive loads as demanding as 27pF in parallel with 500 Ω while holding peaking to within 5dB of peaking at unity gain. Of course if less peaking is desired, a small series resistor (usually between 5 Ω to 50Ω) can be placed in series with the output to eliminate most peaking. However, there will be a small sacrifice of gain which can be recovered by simply adjusting the value of the gain resistor. Driving Cables Both ends of all cables must always be properly terminated; double termination is absolutely necessary for reflection-free performance. Additionally, a back-termination series resistor at the amplifier's output will isolate the amplifier from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back- termination resistor. Again, a small series resistor at the output can help to reduce peaking. Gain BW GainBandwidthProduct = × EL5152, EL5153, EL5252, EL5455 |
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