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EL5171ISZ Datasheet(PDF) 9 Page - Intersil Corporation |
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EL5171ISZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 14 page 9 FN7307.6 October 30, 2006 Simplified Schematic Description of Operation and Application Information Product Description The EL5171 and EL5371 are wide bandwidth, low power and single ended to differential output amplifiers. The EL5171 is a single channel differential amplifier. Since the IN- pin and REF pin are tired together internally, the EL5171 can be used as a single ended to differential converter. The EL5371 is a triple channel differential amplifier. The EL5371 have a separate IN- pin and REF pin for each channel. It can be used as single/differential ended to differential converter. The EL5171 and EL5371 are internally compensated for closed loop gain of +1 of greater. Connected in gain of 1 and driving a 1k Ω differential load, the EL5171 and EL5371 have a -3dB bandwidth of 250MHz. Driving a 200 Ω differential load at gain of 2, the bandwidth is about 30MHz. The EL5371 is available with a power down feature to reduce the power while the amplifier is disabled. Input, Output, and Supply Voltage Range The EL5171 and EL5371 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 -4.5V 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 3.8V. 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 EL5171 and EL5371 can swing from -3.9V to +3.9V 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 For EL5171, since the IN- pin and REF pin are bounded together as the REF pin in an 8 Ld package, the signal at the REF pin is part of the common mode signal and also part of the differential mode signal. For the true balance differential outputs, the REF pin must be tired to the same bias level as the IN+ pin. For a ±5V supply, just tire the REF pin to GND if the IN+ pin is biased at 0V with a 50Ω or 75Ω termination resistor. For a single supply application, if the IN+ is biased to half of the rail, the REF pin should be biased to half of the rail also. The gain setting for EL5171 is: Where: •VREF = 0V •RF1 = RF2 = RF EL5371 has a separate IN- pin and REF pin. It can be used as a single/differential ended to differential converter. The voltage applied at REF pin can set the output common mode voltage and the gain is one. 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- VODM VIN+1 RF1 RF2 + RG ---------------------------- + ⎝⎠ ⎜⎟ ⎛⎞ × = VODM VIN+1 2RF RG ----------- + ⎝⎠ ⎜⎟ ⎛⎞ × = VOCM VREF 0V = = EL5171, EL5371 |
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