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GS1578ACNE3 データシート(PDF) 11 Page - Gennum Corporation |
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GS1578ACNE3 データシート(HTML) 11 Page - Gennum Corporation |
11 / 15 page GS1578A Data Sheet 33657 - 4 March 2006 11 of 15 4.3 Output Return Loss Measurement To perform a practical return loss measurement, it is necessary to force the GS1578A output to a DC high or low condition. The actual measured return loss will be based on the outputs being static at VCC or VCC-1.6V. Under normal operating conditions the outputs of the device swing between VCC-0.4V and VCC-1.2V, so the measured value of return loss will not represent the actual operating return loss. A simple method of calculating the values of actual operating return loss is to interpolate the two return loss measurements. In this way, the values of return loss are estimated at VCC-0.4V and VCC-1.2V based on the measurements at VCC and VCC-1.6V. The two values of return loss (high and low) will typically differ by several decibels. If the measured return loss is RH for logic high and RL for logic low, then the two values can be interpolated as follows: RIH = RH- (RH-RL)/4 and RIL = RL+(RH-RL)/4 where RIH is the interpolated logic high value and RIL is the interpolated logic low value. For example, if RH = -18dB and RL = -14dB, then the interpolated values are RIH = -17dB and RIL = -15dB. 4.4 Output Amplitude (RSET) The output amplitude of the GS1578A is set to 800mVp-p with a tolerance of ±7% using an RSET resistor of 750 Ω. A ±1% SMT resistor should be used. The RSET resistor is part of the high speed output circuit of the GS1578A. The resistor should be placed as close as possible to the RSET pin. In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin. NOTE: Only an RSET value of 750Ω ±1% should be used. Using other values for RSET is not recommended. |
同様の部品番号 - GS1578ACNE3 |
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同様の説明 - GS1578ACNE3 |
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