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EL5173 Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5173 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN7312.7 February 4, 2008 Simplified Schematic Description of Operation and Application Information Product Description The EL5173 and EL5373 are wide bandwidth, low power and single/differential ended to differential output amplifiers. They have a fixed gain of 2. The EL5173 is a single channel differential amplifier. The EL5373 is a triple channel differential amplifier. The EL5173 and EL5373 have a -3dB bandwidth of 450MHz while driving a 200 Ω differential load. The EL5173 and EL5373 are available with a power down feature to reduce the power while the amplifiers are disabled. Input, Output and Supply Voltage Range The EL5173 and EL5373 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 3.7V. 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 EL5173 and EL5373 can swing from -3.3V to 3.6V at 200 Ω differential load at ±5V supply. As the load resistance becomes lower, the output swing is reduced. Differential and Common Mode Gain Settings As shown at the simplified schematic, since the feedback resistors RF and the gain resistor are integrated with 200 Ω and 400 Ω, the EL5173 and EL5373 have a fixed gain of 2. The common mode gain is always one. Driving Capacitive Loads and Cables The EL5173 and EL5373 can drive 16pF differential capacitor in parallel with 200 Ω differential load with less than 3.5dB 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 each output to eliminate most peaking. However, this will reduce the gain slightly. 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 EL5173 and EL5373 can be disabled and placed their outputs in a high impedance state. The turn off time is about 1.2µs and the turn on time is about 100ns. When disabled, the amplifier’s supply current is reduced to 40µA for IS+ and 2.5µA for IS- typically, thereby effectively eliminating the power consumption. The amplifier’s power down can be controlled by standard CMOS signal levels at the ENABLE pin. The applied logic signal is relative to VS+ pin. Letting the EN pin float or applying a signal that is less than 1.5V below VS+ will enable the amplifier. The amplifier will be disabled when the signal at EN pin is above VS+ - 0.5V. Output Drive Capability The EL5173 and EL5373 have internal short circuit protection. Its typical short circuit current is ±55mA. If the output is shorted indefinitely, the power dissipation could easily increase such that the part will be destroyed. 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- 200 Ω 200 Ω 400 Ω EL5173, EL5373 |
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