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EL5177IYZ-T7 Datasheet(PDF) 8 Page - Intersil Corporation |
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EL5177IYZ-T7 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 11 page 8 FN7344.4 May 10, 2007 Simplified Schematic Description of Operation and Application Information Product Description The EL5177 is a wide bandwidth, low power and single/differential ended to differential output amplifier. It can be used as single/differential ended to differential converter. The EL5177 is internally compensated for closed loop gain of +1 of greater. Connected in gain of 1 and driving a 1k Ω differential load, the EL5177 has a -3dB bandwidth of 550MHz. Driving a 200 Ω differential load at gain of 2, the bandwidth is about 130MHz. The EL5177 is available with a power down feature to reduce the power while the amplifier is disabled. Input, Output, and Supply Voltage Range The EL5177 has 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 3.4V for ±5V supply. The differential mode input range (DMIR) between the two inputs is from -2.3V to +2.3V. The input voltage range at the REF pin is from -3.3V to 3.7V. If the input common mode or differential mode signal is outside the above-specified ranges, it will cause the output signal distorted. The output of the EL5177 can swing from -3.8V to +3.8V at 1k Ω differential load at ±5V supply. As the load resistance becomes lower, the output swing is reduced. Differential and Common Mode Gain Settings The voltage applied at REF pin can set the output common mode voltage and the gain is one. The differential gain is set by the RF and RG network. The gain setting for EL5177 is: Where: RF1 = RF2 = RF 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 FBP pin and OUT- pin to FBN 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 REF R10 R9 RCD RCD OUT+ OUT- CC R6 R5 CC R4 R3 R7 R8 R2 R1 VB1 FBN FBP IN- IN+ VB2 VS+ VS- V ODM V IN ( +V IN- ) 1 R F1 R F2 + R G ---------------------------- + ⎝⎠ ⎜⎟ ⎛⎞ × – = V ODM V IN ( +V IN- ) 1 2R F R G ----------- + ⎝⎠ ⎜⎟ ⎛⎞ × – = V OCM V REF = VO+ FBP RG RF2 IN+ IN- REF FBN VIN+ VIN- VREF RF1 VO- EL5177 |
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