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GS1578ACNE3 データシート(PDF) 11 Page - Gennum Corporation

部品番号 GS1578ACNE3
部品情報  GS1578A HD-LINX-R II Multi-Rate Dual Slew-Rate Cable Driver
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メーカー  GENNUM [Gennum Corporation]
ホームページ  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS1578ACNE3 データシート(HTML) 11 Page - Gennum Corporation

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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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