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EL1509CS-T7 Datasheet(PDF) 8 Page - Intersil Corporation |
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EL1509CS-T7 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN7015.2 March 26, 2007 Capacitance at the Inverting Input Due to the topology of the current feedback amplifier, stray capacitance at the inverting input will affect the AC and transient performance of the EL1509 when operating in the non-inverting configuration. In the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a virtual ground and stray capacitance is therefore not “seen” by the amplifier. Feedback Resistor Values The EL1509 has been designed and specified with RF = 1.5k Ω for AV = +5. This value of feedback resistor yields extremely flat frequency response with little to no peaking out to 50MHz. As is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. Inversely, larger values of feedback resistor will cause rolloff to occur at a lower frequency. See the curves in the Typical Performance Curves section which show 3dB bandwidth and peaking vs. frequency for various feedback resistors and various supply voltages. Bandwidth vs Temperature Whereas many amplifier's supply current and consequently 3dB bandwidth drop off at high temperature, the EL1509 was designed to have little supply current variations with temperature. An immediate benefit from this is that the 3dB bandwidth does not drop off drastically with temperature. Supply Voltage Range The EL1509 has been designed to operate with supply voltages from ±2.5V to ±6V. Optimum bandwidth, slew rate, and video characteristics are obtained at higher supply voltages. However, at ±2.5V supplies, the 3dB bandwidth at AV = +2 is a respectable 40MHz. Single Supply Operation If a single supply is desired, values from +5V to +12V can be used as long as the input common mode range is not exceeded. When using a single supply, be sure to either 1) DC bias the inputs at an appropriate common mode voltage and AC couple the signal, or 2) ensure the driving signal is within the common mode range of the EL1509. ADSL CPE Applications The EL1509 is designed as a line driver for ADSL CPE modems. It is capable of outputting 250mA of output current with a typical supply voltage headroom of 1.3V. It can achieve -85dBc of distortion at low 7.1mA of supply current per amplifier. The average line power requirement for the ADSL CPE application is 13dBm (20mW) into a 100 Ω line. The average line voltage is 1.41VRMS. The ADSL DMT peak to average ratio (crest factor) of 5.3 implies peak voltage of 7.5V into the line. Using a differential drive configuration and transformer coupling with standard back termination, a transformer ratio of 1:2 is selected. The circuit configuration is as shown below. - + - + TX1 1:2 12.5 12.5 1.5k 1.5k 464 Ω AFE 100 EL1509 |
Similar Part No. - EL1509CS-T7 |
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Similar Description - EL1509CS-T7 |
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