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ISL55004 Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL55004 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 FN6219.2 July 27, 2006 Product Description The ISL55004 is a wide bandwidth, low power, and low offset voltage feedback operational amplifier. This device is 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 around a 200MHz. Driving a 150 Ω load and a gain of 2, the bandwidth is about 90MHz while maintaining a 300V/µs slew rate. The ISL55004 is designed to operate with supply voltage from +15V to -15V. That means for single supply application, the supply voltage is from 0V to 30V. For split supplies application, the supply voltage is from ±15V. The amplifier has 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 ISL55004 can swing from -12.75V to +13.4V for VS = ±15V. As the load resistance becomes lower, the output swing is lower. 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 with proper selection of RF and RG (see Figures15 and 16 for selection). 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 of this device is about 0.01% and 0.05°, 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 ISL55004 can drive 47pF loads in parallel with 500 Ω with less than 3dB of peaking at gain of +1 and as much as 100pF at a gain of +2 with under 3db of peaking. 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. Output Drive Capability The ISL55004 does not have internal short circuit protection circuitry. It has a typical short circuit current of 140mA. 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 ±60mA. This limit is set by the design of the internal metal interconnect. Note that in transient applications, the part is robust. Short circuit protection can be provided externally with a back match resistor in series with the output placed close as possible to the output pin. In video applications this would be a 75 Ω resistor and will provide adequate short circuit protection to the device. Care should still be taken not to stress the device with a short at the output. Power Dissipation With the high output drive capability of the ISL55004, it is possible to exceed the 150°C absolute maximum junction temperature under certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for an application to determine if load conditions or package types need to be modified to assure operation of the amplifier in a safe operating area. The maximum power dissipation allowed in a package is determined according to: Where: •TJMAX = Maximum junction temperature •TAMAX = Maximum ambient temperature • θ JA = Thermal resistance of the package The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage, plus the power in the IC due to the load, or: PD MAX T JMAX T AMAX – Θ JA --------------------------------------------- = ISL55004 |
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