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EL5251IYZ-T13 Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5251IYZ-T13 Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 18 page  11 FN7384.7 January 16, 2008 Product Description The EL5150, EL5151, EL5250, EL5251 and EL5451 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 200MHz. With the loading set to accommodate typical video application, 150 Ω load and gain set to +2, bandwidth reduces to about 40MHz with a 67V/µs slew rate. Power down pins on the EL5151 and EL5251 reduce the already low power demands of this amplifier family to 12µA typical while the amplifier is disabled. Input, Output and Supply Voltage Range The EL5150 and family members 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. And of course split supply operation can easily be achieved using single supplies with 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 3.5V above the negative supply (VS- pin) to 3.5V 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 EL5150 and family members exhibit 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. FIGURE 39. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 40. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Typical Performance Curves (Continued) JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.136W 909mW 870mW 435mW 0 150 50 1.4 1.2 0.4 0 AMBIENT TEMPERATURE (°C) 0.2 125 25 0.8 100 75 85 1.0 0.6 θJA = 88°C/W SO14 θJA = 230°C/W SOT23-5/6 θJA = 110°C/W SO8 θJA = 115°C/W MSOP8/10 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0 150 50 1 0.9 0.2 0 AMBIENT TEMPERATURE (°C) 0.1 125 25 0.5 100 75 85 0.7 0.3 0.8 0.4 0.6 833mW 625mW 486mW 391mW θJA = 265°C/W SOT23-5/6 θJA = 206°C/W MSOP8/10 θJA = 120°C/W SO14 θJA = 160°C/W SO8 EL5150, EL5151, EL5250, EL5251, EL5451 |
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