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EL5372IUZ-T13 Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5372IUZ-T13 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 16 page 11 FN7311.8 January 25, 2008 Description of Operation and Application Information Product Description The EL5172 and EL5372 are wide bandwidth, low power and single/differential ended to single ended output amplifiers. The EL5172 is a single channel differential to single ended amplifier. The EL5372 is a triple channel differential to single ended amplifier. The EL5172 and EL5372 are internally compensated for closed loop gain of +1 or greater. Connected in gain of 1 and driving a 500 Ω load, the EL5172 and EL5372 have a -3dB bandwidth of 250MHz. Driving a 150 Ω load at gain of 2, the bandwidth is about 50MHz. The bandwidth at the REF input is about 450MHz. The EL5172 and EL5372 are available with a power-down feature to reduce the power while the amplifier is disabled. Input, Output and Supply Voltage Range The EL5172 and EL5372 have been designed to operate with a single supply voltage of 5V to 10V or a split supplies with its total voltage from 5V to 10V. The amplifiers have an input common mode voltage range from -4.3V to 3.3V for ±5V supply. The differential mode input range (DMIR) between the two inputs is about from -2.3V to +2.3V. The input voltage range at the REF pin is from -3.6V to 3.3V. If the input common mode or differential mode signal is outside the above-specified ranges, it will cause the output signal to be distorted. The output of the EL5172 and EL5372 can swing from -3.8V to 3.6V at 500 Ω load at ±5V supply. As the load resistance becomes lower, the output swing is reduced respectively. Over All Gain Settings The gain setting for the EL5172 and the EL5372 is similar to the conventional operational amplifier. The output voltage is equal to the difference of the inputs plus VREF and then times the gain. FIGURE 23. Choice of Feedback Resistor and Gain Bandwidth Product For applications that require a gain of +1, no feedback resistor is required. Just short the OUT pin to the FB 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 Pico farad range in parallel with RF can help to reduce the ringing and peaking at the expense of reducing the bandwidth. The bandwidth of the EL5172 and EL5372 depends on the load and the feedback network. RF and RG appear in parallel with the load 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 bandwidth performance. For a gain of +1, RF = 0 is optimum. For the gains other than +1, optimum response is obtained with RF between 500Ω to 1k Ω. For AV = 2 and RF = RG = 1kΩ, the BW is about 80MHz and the frequency response is very flat. The EL5172 and EL5372 have a gain bandwidth product of 100MHz. For gains ≥5, its bandwidth can be predicted by Equation 1: Driving Capacitive Loads and Cables The EL5172 and EL5372 can drive 56pF capacitance in parallel with 500 Ω load to ground with 4dB 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 each 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 EL5172 and EL5372 can be disabled and its outputs placed in a high impedance state. The turn-off time is about 1.4µs and the turn-on time is about 150ns. When disabled, the amplifier's supply current is reduced to 80µA for IS+ and V O V ( IN +VIN -VREF + ) 1 R F R G -------- + ⎝⎠ ⎜⎟ ⎛⎞ × – = - + - + Σ G/B VO EN VIN+ VIN- VREF FB RG RF Gain BW 100MHz = × (EQ. 1) EL5172, EL5372 |
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