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EL5157IW-T7A Datasheet(PDF) 10 Page - Intersil Corporation |
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EL5157IW-T7A Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 17 page  10 FN7386.5 September 13, 2007 EL5156 Product Description The EL5156, EL5157, EL5256, and EL5257 are wide bandwidth, single or dual supply, low power and low offset voltage feedback operational amplifiers. Both amplifiers are internally compensated for closed loop gain of +1 or greater. Connected in voltage follower mode and driving a 500 Ω load, the -3dB bandwidth is about 610MHz. Driving a 150 Ω load and a gain of 2, the bandwidth is about 180MHz while maintaining a 600V/µs slew rate. The EL5156 and EL5256 are available with a power-down pin to reduce power to 17µA typically while the amplifier is disabled. Input, Output and Supply Voltage Range The EL5156 and EL5157 families have been designed to operate with supply voltage from 5V to 12V. That means for single supply application, the supply voltage is from 5V to 12V. For split supplies application, the supply voltage is from ±2.5V to ±5V. The amplifiers have an input common mode voltage range from 1.5V above the negative supply (VS- pin) to 1.5V below 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 outputs of the EL5156 and EL5157 families can swing from -4V to 4V for VS = ±5V. As the load resistance becomes lower, the output swing is lower. If the load resistor is 500 Ω, the output swing is about -4V at a 4V supply. If the load resistor is 150 Ω, the output swing is from -3.5V to 3.5V. 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 can't be very big for optimum performance. If a large value of RF must be used, a small capacitor in the few Pico farad range in parallel with RF can help to reduce the ringing and peaking at the expense of reducing the bandwidth. For gain of +1, RF = 0 is optimum. For the gains other than +1, optimum response is obtained with RF between 500Ω to 750 Ω. The EL5156 and EL5157 families have a gain bandwidth product of 210MHz. For gains ≥5, its bandwidth can be predicted by Equation 1: 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 of the change in output current with DC level. The dG and dP for these families are about 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. Driving Capacitive Loads and Cables The EL5156 and EL5157 families can drive 27pF loads in parallel with 500 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 output to eliminate most peaking. However, this will reduce the gain slightly. If the gain setting is greater than 1, the gain resistor RG can then be chosen to make up for any gain loss which may be created by the additional series resistor at the output. When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, 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. Disable/Power-Down The EL5156 and EL5256 can be disabled and their output placed in a high impedance state. The turn-off time is about 330ns and the turn-on time is about 130ns. When disabled, the amplifier's supply current is reduced to 17µA typically, thereby effectively eliminating the power consumption. The amplifier's power-down can be controlled by standard TTL or CMOS signal levels at the ENABLE pin. The applied logic signal is relative to VS- pin. Letting the ENABLE pin float or applying a signal that is less than 0.8V above VS- will enable the amplifier. The amplifier will be disabled when the signal at ENABLE pin is above VS+ - 1.5V. Output Drive Capability The EL5156 and EL5157 families do not have internal short circuit protection circuitry. They have a typical short circuit current of 95mA and 70mA. If the output is shorted indefinitely, the power dissipation could easily overheat the die or the current could eventually compromise metal integrity. Maximum reliability is maintained if the output current never exceeds ±40mA. This limit is set by the design of the internal metal interconnect. Note that in transient applications, the part is robust. Power Dissipation With the high output drive capability of the EL5152 and EL5153 families, it is possible to exceed the +125°C absolute maximum junction temperature under certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for an application to Gain BW 210MHz = × (EQ. 1) EL5156, EL5157, EL5256, EL5257 |
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