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GS1508-CKAE3 Datasheet(PDF) 7 Page - Gennum Corporation

No. de pieza GS1508-CKAE3
Descripción Electrónicos  HDTV Cable Driver
Download  14 Pages
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Fabricante Electrónico  GENNUM [Gennum Corporation]
Página de inicio  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS1508-CKAE3 Datasheet(HTML) 7 Page - Gennum Corporation

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GS1508 HD-LINX™ HDTV Cable Driver
Data Sheet
9500 - 6
August 2010
7 of 14
Figure 3-3: Static Protection Diodes
3.3 Output Return Loss Measurement
To perform a practical return loss measurement, it is necessary to force the GS1508
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 GS1508 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. With this method, 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; the interpolated values are RIH = -17dB and
RIL = -15dB.
3.4 Output Amplitude Adjustment
The output amplitude of the GS1508 can be adjusted by changing the value of the RSET
resistor as shown in Figure 3-4 and Table 3-1. For an 800mVp-p output with a nominal
±7% tolerance, a value of 53.6% is required. A ±1% SMT resistor should be used.
The RSET resistor is part of the high-speed output circuit of the GS1508. The resistor
should be placed as close as possible to the RSET pin. In addition, PCB capacitance should
be minimized at this node by removing the PCB groundplane beneath the RSET resistor
and the RSET pin.
SDO
SDO
GS1508


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